C语言中，全局静态变量是个什么东西？求解释举例
c\u8bed\u8a00\u6709\u54ea\u51e0\u79cd\u53d8\u91cf?\u5982\u4f55\u5b9a\u4e49\u8fd9\u4e9b\u53d8\u91cf?\u4e3e\u4f8b\u8bf4\u660e\u57fa\u672c\u7684\u6570\u636e\u7c7b\u578b\u6709\uff1a\u6574\u5f62\u3001\u5b9e\u578b\u3001\u5b57\u7b26\u578b\u3001\u6307\u9488\u578b\u7b49
\u6269\u5c55\u7684\u6570\u636e\u7c7b\u578b\u6709\uff1a\u6570\u7ec4\uff0c\u7ed3\u6784\u4f53\uff0c\u8054\u5408\u3001\u5171\u7528\u4f53\u7b49
\u8fd8\u53ef\u4ee5\u6709\u81ea\u5b9a\u4e49\u7684\u7c7b\u578b\u3002
\u4ee5\u4e0b\u662f\u57fa\u672c\u7c7b\u578b\u7684\u8be6\u7ec6\u7684\u8bf4\u660e
\u6700\u597d\u627e\u672cC\u8bed\u8a00\u7684\u4e66\u770b\u770b\uff0c\u7eb8\u4ecb\u8d28\u7248\u7684\u6216\u7535\u5b50\u7248\u7684\u90fd\u884c\uff0c\u5efa\u8bae\u770b\u8c2d\u8bf0\u5f3a\u7684c\u7a0b\u5e8f\u8bbe\u8ba1\uff0c\u6700\u65b0\u7684\u662f\u7b2c\u4e09\u7248\uff0c\u672c\u4eba\u5b66\u4e60\u65f6\u662f\u4e8c\u7248
\u6574\u578b\u91cf
\u6574\u578b\u91cf\u5305\u62ec\u6574\u578b\u5e38\u91cf\u3001\u6574\u578b\u53d8\u91cf\u3002\u6574\u578b\u5e38\u91cf\u5c31\u662f\u6574\u5e38\u6570\u3002\u5728C\u8bed\u8a00\u4e2d\uff0c\u4f7f\u7528\u7684\u6574\u5e38\u6570\u6709\u516b\u8fdb\u5236\u3001\u5341\u516d\u8fdb\u5236\u548c\u5341\u8fdb\u5236\u4e09\u79cd\u3002
\u6574\u578b\u5e38\u91cf
1.\u516b\u8fdb\u5236\u6574\u5e38\u6570\u516b\u8fdb\u5236\u6574\u5e38\u6570\u5fc5\u987b\u4ee50\u5f00\u5934\uff0c\u5373\u4ee50\u4f5c\u4e3a\u516b\u8fdb\u5236\u6570\u7684\u524d\u7f00\u3002\u6570\u7801\u53d6\u503c\u4e3a0\uff5e7\u3002\u516b\u8fdb\u5236\u6570\u901a\u5e38\u662f\u65e0\u7b26\u53f7\u6570\u3002
\u4ee5\u4e0b\u5404\u6570\u662f\u5408\u6cd5\u7684\u516b\u8fdb\u5236\u6570\uff1a
015(\u5341\u8fdb\u5236\u4e3a13) 0101(\u5341\u8fdb\u5236\u4e3a65) 0177777(\u5341\u8fdb\u5236\u4e3a65535)
\u4ee5\u4e0b\u5404\u6570\u4e0d\u662f\u5408\u6cd5\u7684\u516b\u8fdb\u5236\u6570\uff1a
256(\u65e0\u524d\u7f000) 03A2(\u5305\u542b\u4e86\u975e\u516b\u8fdb\u5236\u6570\u7801) -0127(\u51fa\u73b0\u4e86\u8d1f\u53f7)
2.\u5341\u516d\u8fdb\u5236\u6574\u5e38\u6570
\u5341\u516d\u8fdb\u5236\u6574\u5e38\u6570\u7684\u524d\u7f00\u4e3a0X\u62160x\u3002\u5176\u6570\u7801\u53d6\u503c\u4e3a0~9\uff0cA~F\u6216a~f\u3002
\u4ee5\u4e0b\u5404\u6570\u662f\u5408\u6cd5\u7684\u5341\u516d\u8fdb\u5236\u6574\u5e38\u6570\uff1a
0X2A(\u5341\u8fdb\u5236\u4e3a42) 0XA0 (\u5341\u8fdb\u5236\u4e3a160) 0XFFFF (\u5341\u8fdb\u5236\u4e3a65535)
\u4ee5\u4e0b\u5404\u6570\u4e0d\u662f\u5408\u6cd5\u7684\u5341\u516d\u8fdb\u5236\u6574\u5e38\u6570\uff1a
5A (\u65e0\u524d\u7f000X) 0X3H (\u542b\u6709\u975e\u5341\u516d\u8fdb\u5236\u6570\u7801)
3.\u5341\u8fdb\u5236\u6574\u5e38\u6570
\u5341\u8fdb\u5236\u6574\u5e38\u6570\u6ca1\u6709\u524d\u7f00\u3002\u5176\u6570\u7801\u4e3a0\uff5e9\u3002
\u4ee5\u4e0b\u5404\u6570\u662f\u5408\u6cd5\u7684\u5341\u8fdb\u5236\u6574\u5e38\u6570\uff1a
237 -568 65535 1627
\u4ee5\u4e0b\u5404\u6570\u4e0d\u662f\u5408\u6cd5\u7684\u5341\u8fdb\u5236\u6574\u5e38\u6570\uff1a
023 (\u4e0d\u80fd\u6709\u524d\u5bfc0) 23D (\u542b\u6709\u975e\u5341\u8fdb\u5236\u6570\u7801)
\u5728\u7a0b\u5e8f\u4e2d\u662f\u6839\u636e\u524d\u7f00\u6765\u533a\u5206\u5404\u79cd\u8fdb\u5236\u6570\u7684\u3002\u56e0\u6b64\u5728\u4e66\u5199\u5e38\u6570\u65f6\u4e0d\u8981\u628a\u524d\u7f00\u5f04\u9519\u9020\u6210\u7ed3\u679c\u4e0d\u6b63\u786e\u30024.\u6574\u578b\u5e38\u6570\u7684\u540e\u7f00\u572816\u4f4d\u5b57\u957f\u7684\u673a\u5668\u4e0a\uff0c\u57fa\u672c\u6574\u578b\u7684\u957f\u5ea6\u4e5f\u4e3a16\u4f4d\uff0c\u56e0\u6b64\u8868\u793a\u7684\u6570\u7684\u8303\u56f4\u4e5f\u662f\u6709\u9650\u5b9a\u7684\u3002\u5341\u8fdb\u5236\u65e0\u7b26\u53f7\u6574\u5e38\u6570\u7684\u8303\u56f4\u4e3a0\uff5e65535\uff0c\u6709\u7b26\u53f7\u6570\u4e3a-32768\uff5e+32767\u3002\u516b\u8fdb\u5236\u65e0\u7b26\u53f7\u6570\u7684\u8868\u793a\u8303\u56f4\u4e3a0\uff5e0177777\u3002\u5341\u516d\u8fdb\u5236\u65e0\u7b26\u53f7\u6570\u7684\u8868\u793a\u8303\u56f4\u4e3a0X0\uff5e0XFFFF\u62160x0\uff5e0xFFFF\u3002\u5982\u679c\u4f7f\u7528\u7684\u6570\u8d85\u8fc7\u4e86\u4e0a\u8ff0\u8303\u56f4\uff0c\u5c31\u5fc5\u987b\u7528\u957f\u6574\u578b\u6570\u6765\u8868\u793a\u3002\u957f\u6574\u578b\u6570\u662f\u7528\u540e\u7f00\u201cL\u201d\u6216\u201cl\u201d\u6765\u8868\u793a\u7684\u3002\u4f8b\u5982\uff1a
\u5341\u8fdb\u5236\u957f\u6574\u5e38\u6570 158L (\u5341\u8fdb\u5236\u4e3a158) 358000L (\u5341\u8fdb\u5236\u4e3a-358000)
\u516b\u8fdb\u5236\u957f\u6574\u5e38\u6570 012L (\u5341\u8fdb\u5236\u4e3a10) 077L (\u5341\u8fdb\u5236\u4e3a63) 0200000L (\u5341\u8fdb\u5236\u4e3a65536)
\u5341\u516d\u8fdb\u5236\u957f\u6574\u5e38\u6570 0X15L (\u5341\u8fdb\u5236\u4e3a21) 0XA5L (\u5341\u8fdb\u5236\u4e3a165) 0X10000L (\u5341\u8fdb\u5236\u4e3a65536)
\u957f\u6574\u6570158L\u548c\u57fa\u672c\u6574\u5e38\u6570158 \u5728\u6570\u503c\u4e0a\u5e76\u65e0\u533a\u522b\u3002\u4f46\u5bf9158L\uff0c\u56e0\u4e3a\u662f\u957f\u6574\u578b\u91cf\uff0cC\u7f16\u8bd1\u7cfb\u7edf\u5c06\u4e3a\u5b83\u5206\u914d4\u4e2a\u5b57\u8282\u5b58\u50a8\u7a7a\u95f4\u3002\u800c\u5bf9158\uff0c\u56e0\u4e3a\u662f\u57fa\u672c\u6574\u578b\uff0c\u53ea\u5206\u914d2 \u4e2a\u5b57\u8282\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u56e0\u6b64\u5728\u8fd0\u7b97\u548c\u8f93\u51fa\u683c\u5f0f\u4e0a\u8981\u4e88\u4ee5\u6ce8\u610f\uff0c\u907f\u514d\u51fa\u9519\u3002\u65e0\u7b26\u53f7\u6570\u4e5f\u53ef\u7528\u540e\u7f00\u8868\u793a\uff0c\u6574\u578b\u5e38\u6570\u7684\u65e0\u7b26\u53f7\u6570\u7684\u540e\u7f00\u4e3a\u201cU\u201d\u6216\u201cu\u201d\u3002\u4f8b\u5982\uff1a 358u,0x38Au,235Lu \u5747\u4e3a\u65e0\u7b26\u53f7\u6570\u3002\u524d\u7f00\uff0c\u540e\u7f00\u53ef\u540c\u65f6\u4f7f\u7528\u4ee5\u8868\u793a\u5404\u79cd\u7c7b\u578b\u7684\u6570\u3002\u59820XA5Lu\u8868\u793a\u5341\u516d\u8fdb\u5236\u65e0\u7b26\u53f7\u957f\u6574\u6570A5\uff0c\u5176\u5341\u8fdb\u5236\u4e3a165\u3002
\u6574\u578b\u53d8\u91cf
\u6574\u578b\u53d8\u91cf\u53ef\u5206\u4e3a\u4ee5\u4e0b\u51e0\u7c7b\uff1a
1.\u57fa\u672c\u578b
\u7c7b\u578b\u8bf4\u660e\u7b26\u4e3aint\uff0c\u5728\u5185\u5b58\u4e2d\u53602\u4e2a\u5b57\u8282\uff0c\u5176\u53d6\u503c\u4e3a\u57fa\u672c\u6574\u5e38\u6570\u3002
2.\u77ed\u6574\u91cf
\u7c7b\u578b\u8bf4\u660e\u7b26\u4e3ashort int\u6216short'C110F1\u3002\u6240\u5360\u5b57\u8282\u548c\u53d6\u503c\u8303\u56f4\u5747\u4e0e\u57fa\u672c\u578b\u76f8\u540c\u3002
3.\u957f\u6574\u578b
\u7c7b\u578b\u8bf4\u660e\u7b26\u4e3along int\u6216long \uff0c\u5728\u5185\u5b58\u4e2d\u53604\u4e2a\u5b57\u8282\uff0c\u5176\u53d6\u503c\u4e3a\u957f\u6574\u5e38\u6570\u3002
4.\u65e0\u7b26\u53f7\u578b
\u7c7b\u578b\u8bf4\u660e\u7b26\u4e3aunsigned\u3002
\u65e0\u7b26\u53f7\u578b\u53c8\u53ef\u4e0e\u4e0a\u8ff0\u4e09\u79cd\u7c7b\u578b\u5339\u914d\u800c\u6784\u6210\uff1a
(1)\u65e0\u7b26\u53f7\u57fa\u672c\u578b \u7c7b\u578b\u8bf4\u660e\u7b26\u4e3aunsigned int\u6216unsigned\u3002
(2)\u65e0\u7b26\u53f7\u77ed\u6574\u578b \u7c7b\u578b\u8bf4\u660e\u7b26\u4e3aunsigned short
(3)\u65e0\u7b26\u53f7\u957f\u6574\u578b \u7c7b\u578b\u8bf4\u660e\u7b26\u4e3aunsigned long
\u5404\u79cd\u65e0\u7b26\u53f7\u7c7b\u578b\u91cf\u6240\u5360\u7684\u5185\u5b58\u7a7a\u95f4\u5b57\u8282\u6570\u4e0e\u76f8\u5e94\u7684\u6709\u7b26\u53f7\u7c7b\u578b\u91cf\u76f8\u540c\u3002\u4f46\u7531\u4e8e\u7701\u53bb\u4e86\u7b26\u53f7\u4f4d\uff0c\u6545\u4e0d\u80fd\u8868\u793a\u8d1f\u6570\u3002 \u4e0b\u8868\u5217\u51fa\u4e86Turbo C\u4e2d\u5404\u7c7b\u6574\u578b\u91cf\u6240\u5206\u914d\u7684\u5185\u5b58\u5b57\u8282\u6570\u53ca\u6570\u7684\u8868\u793a\u8303\u56f4\u3002
\u7c7b\u578b\u8bf4\u660e\u7b26 \u6570\u7684\u8303\u56f4 \u5206\u914d\u5b57\u8282\u6570
int -32768~32767 \u25a0\u25a0
short int -32768~32767 \u25a0\u25a0
signed int -32768~32767 \u25a0\u25a0
unsigned int 0~65535 \u25a0\u25a0
long int -2147483648~2147483647 \u25a0\u25a0\u25a0\u25a0
unsigned long 0~4294967295 \u25a0\u25a0\u25a0\u25a0
\u6574\u578b\u53d8\u91cf\u7684\u8bf4\u660e
\u53d8\u91cf\u8bf4\u660e\u7684\u4e00\u822c\u5f62\u5f0f\u4e3a\uff1a \u7c7b\u578b\u8bf4\u660e\u7b26 \u53d8\u91cf\u540d\u6807\u8bc6\u7b26\uff0c\u53d8\u91cf\u540d\u6807\u8bc6\u7b26\uff0c...; \u4f8b\u5982\uff1a
int a,b,c; (a,b,c\u4e3a\u6574\u578b\u53d8\u91cf)
long x,y; (x,y\u4e3a\u957f\u6574\u578b\u53d8\u91cf)
unsigned p,q; (p,q\u4e3a\u65e0\u7b26\u53f7\u6574\u578b\u53d8\u91cf)
\u5728\u4e66\u5199\u53d8\u91cf\u8bf4\u660e\u65f6\uff0c\u5e94\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a
1.\u5141\u8bb8\u5728\u4e00\u4e2a\u7c7b\u578b\u8bf4\u660e\u7b26\u540e\uff0c\u8bf4\u660e\u591a\u4e2a\u76f8\u540c\u7c7b\u578b\u7684\u53d8\u91cf\u3002\u5404\u53d8\u91cf\u540d\u4e4b\u95f4\u7528\u9017\u53f7\u95f4\u9694\u3002\u7c7b\u578b\u8bf4\u660e\u7b26\u4e0e\u53d8\u91cf\u540d\u4e4b\u95f4\u81f3\u5c11\u7528\u4e00\u4e2a\u7a7a\u683c\u95f4\u9694\u3002
2.\u6700\u540e\u4e00\u4e2a\u53d8\u91cf\u540d\u4e4b\u540e\u5fc5\u987b\u4ee5\u201c\uff1b\u201d\u53f7\u7ed3\u5c3e\u3002
3.\u53d8\u91cf\u8bf4\u660e\u5fc5\u987b\u653e\u5728\u53d8\u91cf\u4f7f\u7528\u4e4b\u524d\u3002\u4e00\u822c\u653e\u5728\u51fd\u6570\u4f53\u7684\u5f00\u5934\u90e8\u5206\u3002
[Practice] //1int a,b;
short int c;
short d=100;
a=d-20;
b=a+d;
c=a+b+d;
d=d-a+c-b;'Vtable
a,2,0
b,2,0
c,2,0
d,2,100
of Vtable
'Vupdate
1,0;2,0
3,0
4,100
1,80
2,180
3,360
4,200
of Vupdate
of Practice
[Practice] //2int a=5;
int b=9;
long int c;
long d;
c=a+b-7;
d=a*b*c;
c=d*d*d;
a=c-d;'Vtable
a,2,5
b,2,9
c,4,0
d,4,0
of Vtable
'Vupdate
1,5
2,9
3,0
4,0
3,7
4,315
3,31255875
1,-5112
of Vupdate
of Practice
[Practice] //3int a=6,b=19;
unsigned int c;
int d;
c=a-b+7;
d=b*c;
a=b+c+d;
b=-a;'Vtable
a,2,6
b,2,19
c,2,0
d,2,0
of Vtable
'Vupdate
1,6;2,19
3,0
4,0
3,65530
4,-114
1,-101
2,101
of Vupdate
of Practice
void main(){
long x,y;
int a,b,c,d;
x=5;
y=6;
a=7;
b=8;
c=x+a;
d=y+b;
printf("c=x+a=%d,d=y+b=%d\n",c,d);
}
\u5c06main\u8bf4\u660e\u4e3a\u8fd4\u56devoid,\u5373\u4e0d\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b\u7684\u503c
x,y\u88ab\u5b9a\u4e49\u4e3along\u578b
a,b,c,d\u88ab\u5b9a\u4e49\u4e3aint\u578b
5->x
6->y
7->a
8->b
x+a->c
y+b->d
\u663e\u793a\u7a0b\u5e8f\u8fd0\u884c\u7ed3\u679c of long x,y;
int a,b,c,d;
c=x+a;
d=y+b;
\u4ece\u7a0b\u5e8f\u4e2d\u53ef\u4ee5\u770b\u5230\uff1ax, y\u662f\u957f\u6574\u578b\u53d8\u91cf\uff0ca, b\u662f\u57fa\u672c\u6574\u578b\u53d8\u91cf\u3002\u5b83\u4eec\u4e4b\u95f4\u5141\u8bb8\u8fdb\u884c\u8fd0\u7b97\uff0c\u8fd0\u7b97\u7ed3\u679c\u4e3a\u957f\u6574\u578b\u3002\u4f46c\uff0cd\u88ab\u5b9a\u4e49\u4e3a\u57fa\u672c\u6574\u578b\uff0c\u56e0\u6b64\u6700\u540e\u7ed3\u679c\u4e3a\u57fa\u672c\u6574\u578b\u3002\u672c\u4f8b\u8bf4\u660e\uff0c\u4e0d\u540c\u7c7b\u578b\u7684\u91cf\u53ef\u4ee5\u53c2\u4e0e\u8fd0\u7b97\u5e76\u76f8\u4e92\u8d4b\u503c\u3002\u5176\u4e2d\u7684\u7c7b\u578b\u8f6c\u6362\u662f\u7531\u7f16\u8bd1\u7cfb\u7edf\u81ea\u52a8\u5b8c\u6210\u7684\u3002\u6709\u5173\u7c7b\u578b\u8f6c\u6362\u7684\u89c4\u5219\u5c06\u5728\u4ee5\u540e\u4ecb\u7ecd\u3002
\u5b9e\u578b\u91cf
\u5b9e\u578b\u5e38\u91cf
\u5b9e\u578b\u4e5f\u79f0\u4e3a\u6d6e\u70b9\u578b\u3002\u5b9e\u578b\u5e38\u91cf\u4e5f\u79f0\u4e3a\u5b9e\u6570\u6216\u8005\u6d6e\u70b9\u6570\u3002\u5728C\u8bed\u8a00\u4e2d\uff0c\u5b9e\u6570\u53ea\u91c7\u7528\u5341\u8fdb\u5236\u3002\u5b83\u6709\u4e8c\u79cd\u5f62\u5f0f\uff1a \u5341\u8fdb\u5236\u6570\u5f62\u5f0f\u6307\u6570\u5f62\u5f0f
1.\u5341\u8fdb\u5236\u6570\u5f62\u5f0f
\u7531\u6570\u78010~ 9\u548c\u5c0f\u6570\u70b9\u7ec4\u6210\u3002\u4f8b\u5982\uff1a0.0\uff0c.25\uff0c5.789\uff0c0.13\uff0c5.0\uff0c300.\uff0c-267.8230\u7b49\u5747\u4e3a\u5408\u6cd5\u7684\u5b9e\u6570\u3002
2.\u6307\u6570\u5f62\u5f0f
\u7531\u5341\u8fdb\u5236\u6570\uff0c\u52a0\u9636\u7801\u6807\u5fd7\u201ce\u201d\u6216\u201cE\u201d\u4ee5\u53ca\u9636\u7801\uff08\u53ea\u80fd\u4e3a\u6574\u6570\uff0c\u53ef\u4ee5\u5e26\u7b26\u53f7\uff09\u7ec4\u6210\u3002\u5176\u4e00\u822c\u5f62\u5f0f\u4e3aa E n \uff08a\u4e3a\u5341\u8fdb\u5236\u6570\uff0cn\u4e3a\u5341\u8fdb\u5236\u6574\u6570\uff09\u5176\u503c\u4e3a a*10,n \u5982\uff1a 2.1E5 (\u7b49\u4e8e2.1*10,5), 3.7E-2 (\u7b49\u4e8e3.7*10,)-2*) 0.5E7 (\u7b49\u4e8e0.5*10,7), -2.8E-2 (\u7b49\u4e8e-2.8*10,)-2*)\u4ee5\u4e0b\u4e0d\u662f\u5408\u6cd5\u7684\u5b9e\u6570 345 (\u65e0\u5c0f\u6570\u70b9) E7 (\u9636\u7801\u6807\u5fd7E\u4e4b\u524d\u65e0\u6570\u5b57) -5 (\u65e0\u9636\u7801\u6807\u5fd7) 53.-E3 (\u8d1f\u53f7\u4f4d\u7f6e\u4e0d\u5bf9) 2.7E (\u65e0\u9636\u7801)
\u6807\u51c6C\u5141\u8bb8\u6d6e\u70b9\u6570\u4f7f\u7528\u540e\u7f00\u3002\u540e\u7f00\u4e3a\u201cf\u201d\u6216\u201cF\u201d\u5373\u8868\u793a\u8be5\u6570\u4e3a\u6d6e\u70b9\u6570\u3002\u5982356f\u548c356.\u662f\u7b49\u4ef7\u7684\u3002\u4f8b2.2\u8bf4\u660e\u4e86\u8fd9\u79cd\u60c5\u51b5\uff1a
void main()
{
printf("%f\n%f\n",356.,356f);
}
void \u6307\u660emain\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c \u5229\u7528printf\u663e\u793a\u7ed3\u679c \u7ed3\u675f
\u5b9e\u578b\u53d8\u91cf
\u5b9e\u578b\u53d8\u91cf\u5206\u4e3a\u4e24\u7c7b\uff1a\u5355\u7cbe\u5ea6\u578b\u548c\u53cc\u7cbe\u5ea6\u578b\uff0c
\u5176\u7c7b\u578b\u8bf4\u660e\u7b26\u4e3afloat \u5355\u7cbe\u5ea6\u8bf4\u660e\u7b26\uff0cdouble \u53cc\u7cbe\u5ea6\u8bf4\u660e\u7b26\u3002\u5728Turbo C\u4e2d\u5355\u7cbe\u5ea6\u578b\u53604\u4e2a\u5b57\u8282\uff0832\u4f4d\uff09\u5185\u5b58\u7a7a\u95f4\uff0c\u5176\u6570\u503c\u8303\u56f4\u4e3a3.4E-38\uff5e3.4E+38\uff0c\u53ea\u80fd\u63d0\u4f9b\u4e03\u4f4d\u6709\u6548\u6570\u5b57\u3002\u53cc\u7cbe\u5ea6\u578b\u53608 \u4e2a\u5b57\u8282\uff0864\u4f4d\uff09\u5185\u5b58\u7a7a\u95f4\uff0c\u5176\u6570\u503c\u8303\u56f4\u4e3a1.7E-308\uff5e1.7E+308\uff0c\u53ef\u63d0\u4f9b16\u4f4d\u6709\u6548\u6570\u5b57\u3002
\u5b9e\u578b\u53d8\u91cf\u8bf4\u660e\u7684\u683c\u5f0f\u548c\u4e66\u5199\u89c4\u5219\u4e0e\u6574\u578b\u76f8\u540c\u3002
\u4f8b\u5982\uff1a float x,y; (x,y\u4e3a\u5355\u7cbe\u5ea6\u5b9e\u578b\u91cf)
double a,b,c; (a,b,c\u4e3a\u53cc\u7cbe\u5ea6\u5b9e\u578b\u91cf)
\u5b9e\u578b\u5e38\u6570\u4e0d\u5206\u5355\u3001\u53cc\u7cbe\u5ea6\uff0c\u90fd\u6309\u53cc\u7cbe\u5ea6double\u578b\u5904\u7406\u3002
void main()
{
float a;
double b;
a=33333.33333;
b=33333.33333333333333;
printf("%f\n%f\n",a,b);
}
\u6b64\u7a0b\u5e8f\u8bf4\u660efloat\u3001double\u7684\u4e0d\u540c
a \u25a0\u25a0\u25a0\u25a0
b \u25a0\u25a0\u25a0\u25a0\u25a0\u25a0\u25a0\u25a0
a<---33333.33333
b<---33333.33333333333;;
\u663e\u793a\u7a0b\u5e8f\u7ed3\u679c
\u6b64\u7a0b\u5e8f\u8bf4\u660efloat\u3001double\u7684\u4e0d\u540c
float a;
double b;
a=33333.33333;
b=33333.33333333333333; \u4ece\u672c\u4f8b\u53ef\u4ee5\u770b\u51fa\uff0c\u7531\u4e8ea \u662f\u5355\u7cbe\u5ea6\u6d6e\u70b9\u578b\uff0c\u6709\u6548\u4f4d\u6570\u53ea\u6709\u4e03\u4f4d\u3002\u800c\u6574\u6570\u5df2\u5360\u4e94\u4f4d\uff0c\u6545\u5c0f\u6570\u4e8c\u4f4d\u540e\u4e4b\u540e\u5747\u4e3a\u65e0\u6548\u6570\u5b57\u3002b \u662f\u53cc\u7cbe\u5ea6\u578b\uff0c\u6709\u6548\u4f4d\u4e3a\u5341\u516d\u4f4d\u3002\u4f46Turbo C \u89c4\u5b9a\u5c0f\u6570\u540e\u6700\u591a\u4fdd\u7559\u516d\u4f4d\uff0c\u5176\u4f59\u90e8\u5206\u56db\u820d\u4e94\u5165\u3002
[Practice] //floatint a=32;
float b;
double d;
b=12345678;
d=b*100;
d=d+a;
d=d+58.123456;'Vtable
a,2,32
b,4,0.0
d,8,0.0
of Vtable
'Vupdate
1,32
2,0
3,0
2,12345678.00000
3,1234567800
3,1234567832
3,1234567890.123456
of Vupdate
of Practice
[Practice] //1int a=543;
float b;
b=123.123962+a;
b=b-100;
a=b;'Vtable
a,2,543
b,4,0.0
of Vtable
'Vupdate
1,543
2,0.0
2,123.123962
2,23.123962
1,23
of Vupdate
of Practice
\u5b57\u7b26\u578b\u91cf
\u5b57\u7b26\u578b\u91cf\u5305\u62ec\u5b57\u7b26\u5e38\u91cf\u548c\u5b57\u7b26\u53d8\u91cf\u3002
\u5b57\u7b26\u5e38\u91cf
\u5b57\u7b26\u5e38\u91cf\u662f\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u7684\u4e00\u4e2a\u5b57\u7b26\u3002\u4f8b\u5982'a','b','=','+','?'\u90fd\u662f\u5408\u6cd5\u5b57\u7b26\u5e38\u91cf\u3002\u5728C\u8bed\u8a00\u4e2d\uff0c\u5b57\u7b26\u5e38\u91cf\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a
1.\u5b57\u7b26\u5e38\u91cf\u53ea\u80fd\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u4e0d\u80fd\u7528\u53cc\u5f15\u53f7\u6216\u5176\u5b83\u62ec\u53f7\u3002
2.\u5b57\u7b26\u5e38\u91cf\u53ea\u80fd\u662f\u5355\u4e2a\u5b57\u7b26\uff0c\u4e0d\u80fd\u662f\u5b57\u7b26\u4e32\u3002
3.\u5b57\u7b26\u53ef\u4ee5\u662f\u5b57\u7b26\u96c6\u4e2d\u4efb\u610f\u5b57\u7b26\u3002\u4f46\u6570\u5b57\u88ab\u5b9a\u4e49\u4e3a\u5b57\u7b26\u578b\u4e4b\u540e\u5c31
\u4e0d\u80fd\u53c2\u4e0e\u6570\u503c\u8fd0\u7b97\u3002\u5982'5'\u548c5 \u662f\u4e0d\u540c\u7684\u3002'5'\u662f\u5b57\u7b26\u5e38\u91cf\uff0c\u4e0d\u80fd\u53c2\u4e0e\u8fd0\u7b97\u3002
\u8f6c\u4e49\u5b57\u7b26
\u8f6c\u4e49\u5b57\u7b26\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u5b57\u7b26\u5e38\u91cf\u3002\u8f6c\u4e49\u5b57\u7b26\u4ee5\u53cd\u659c\u7ebf"\"\u5f00\u5934\uff0c\u540e\u8ddf\u4e00\u4e2a\u6216\u51e0\u4e2a\u5b57\u7b26\u3002\u8f6c\u4e49\u5b57\u7b26\u5177\u6709\u7279\u5b9a\u7684\u542b\u4e49\uff0c\u4e0d\u540c\u4e8e\u5b57\u7b26\u539f\u6709\u7684\u610f\u4e49\uff0c\u6545\u79f0\u201c\u8f6c\u4e49\u201d\u5b57\u7b26\u3002\u4f8b\u5982\uff0c\u5728\u524d\u9762\u5404\u4f8b\u9898printf\u51fd\u6570\u7684\u683c\u5f0f\u4e32\u4e2d\u7528\u5230\u7684\u201c\n\u201d\u5c31\u662f\u4e00\u4e2a\u8f6c\u4e49\u5b57\u7b26\uff0c\u5176\u610f\u4e49\u662f\u201c\u56de\u8f66\u6362\u884c\u201d\u3002\u8f6c\u4e49\u5b57\u7b26\u4e3b\u8981\u7528\u6765\u8868\u793a\u90a3\u4e9b\u7528\u4e00\u822c\u5b57\u7b26\u4e0d\u4fbf\u4e8e\u8868\u793a\u7684\u63a7\u5236\u4ee3\u7801\u3002
\u5e38\u7528\u7684\u8f6c\u4e49\u5b57\u7b26\u53ca\u5176\u542b\u4e49
\u8f6c\u4e49\u5b57\u7b26 \u8f6c\u4e49\u5b57\u7b26\u7684\u610f\u4e49
\n \u56de\u8f66\u6362\u884c
\t \u6a2a\u5411\u8df3\u5230\u4e0b\u4e00\u5236\u8868\u4f4d\u7f6e
\v \u7ad6\u5411\u8df3\u683c
\b \u9000\u683c
\r \u56de\u8f66
\f \u8d70\u7eb8\u6362\u9875
\\ \u53cd\u659c\u7ebf\u7b26"\"
\' \u5355\u5f15\u53f7\u7b26
\a \u9e23\u94c3
\ddd 1\uff5e3\u4f4d\u516b\u8fdb\u5236\u6570\u6240\u4ee3\u8868\u7684\u5b57\u7b26
\xhh 1\uff5e2\u4f4d\u5341\u516d\u8fdb\u5236\u6570\u6240\u4ee3\u8868\u7684\u5b57\u7b26
\u5e7f\u4e49\u5730\u8bb2\uff0cC\u8bed\u8a00\u5b57\u7b26\u96c6\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\u5b57\u7b26\u5747\u53ef\u7528\u8f6c\u4e49\u5b57\u7b26\u6765\u8868\u793a\u3002\u88682.2\u4e2d\u7684\ddd\u548c\xhh\u6b63\u662f\u4e3a\u6b64\u800c\u63d0\u51fa\u7684\u3002ddd\u548chh\u5206\u522b\u4e3a\u516b\u8fdb\u5236\u548c\u5341\u516d\u8fdb\u5236\u7684ASCII\u4ee3\u7801\u3002\u5982\101\u8868\u793a\u5b57?quot;A" \uff0c\102\u8868\u793a\u5b57\u6bcd"B"\uff0c\134\u8868\u793a\u53cd\u659c\u7ebf\uff0c\XOA\u8868\u793a\u6362\u884c\u7b49\u3002\u8f6c\u4e49\u5b57\u7b26\u7684\u4f7f\u7528
void main()
{
int a,b,c;
a=5; b=6; c=7;
printf("%d\n\t%d %d\n %d %d\t\b%d\n",a,b,c,a,b,c);
}
\u6b64\u7a0b\u5e8f\u7ec3\u4e60\u8f6c\u4e49\u5b57\u7b26\u7684\u4f7f\u7528
a\u3001b\u3001c\u4e3a\u6574\u6570 5->a,6->b,7->c
\u8c03\u7528printf\u663e\u793a\u7a0b\u5e8f\u8fd0\u884c\u7ed3\u679c
printf("%d\n\t%d %d\n %d %d\t\b%d\n",a,b,c,a,b,c);
\u7a0b\u5e8f\u5728\u7b2c\u4e00\u5217\u8f93\u51faa\u503c5\u4e4b\u540e\u5c31\u662f\u201c\n\u201d\uff0c\u6545\u56de\u8f66\u6362\u884c\uff1b\u63a5\u7740\u53c8\u662f\u201c\t\u201d\uff0c\u4e8e\u662f\u8df3\u5230\u4e0b\u4e00\u5236\u8868\u4f4d\u7f6e\uff08\u8bbe\u5236\u8868\u4f4d\u7f6e\u95f4\u9694\u4e3a8\uff09\uff0c\u518d\u8f93\u51fab\u503c6\uff1b\u7a7a\u4e8c\u683c\u518d\u8f93\u51fac \u503c7\u540e\u53c8\u662f"\n"\uff0c\u56e0\u6b64\u518d\u56de\u8f66\u6362\u884c\uff1b\u518d\u7a7a\u4e8c\u683c\u4e4b\u540e\u53c8\u8f93\u51faa\u503c5\uff1b\u518d\u7a7a\u4e09\u683c\u53c8\u8f93\u51fab\u7684\u503c6\uff1b\u518d\u6b21\u540e"\t"\u8df3\u5230\u4e0b\u4e00\u5236\u8868\u4f4d\u7f6e\uff08\u4e0e\u4e0a\u4e00\u884c\u76846 \u5bf9\u9f50\uff09\uff0c\u4f46\u4e0b\u4e00\u8f6c\u4e49\u5b57\u7b26\u201c\b\u201d\u53c8\u4f7f\u9000\u56de\u4e00\u683c\uff0c\u6545\u7d27\u6328\u77406\u518d\u8f93\u51fac\u503c7\u3002
\u5b57\u7b26\u53d8\u91cf
\u5b57\u7b26\u53d8\u91cf\u7684\u53d6\u503c\u662f\u5b57\u7b26\u5e38\u91cf\uff0c\u5373\u5355\u4e2a\u5b57\u7b26\u3002\u5b57\u7b26\u53d8\u91cf\u7684\u7c7b\u578b\u8bf4\u660e\u7b26\u662fchar\u3002\u5b57\u7b26\u53d8\u91cf\u7c7b\u578b\u8bf4\u660e\u7684\u683c\u5f0f\u548c\u4e66\u5199\u89c4\u5219\u90fd\u4e0e\u6574\u578b\u53d8\u91cf\u76f8\u540c\u3002
\u4f8b\u5982\uff1a
char a,b; \u6bcf\u4e2a\u5b57\u7b26\u53d8\u91cf\u88ab\u5206\u914d\u4e00\u4e2a\u5b57\u8282\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u56e0\u6b64\u53ea\u80fd\u5b58\u653e\u4e00\u4e2a\u5b57\u7b26\u3002\u5b57\u7b26\u503c\u662f\u4ee5ASCII\u7801\u7684\u5f62\u5f0f\u5b58\u653e\u5728\u53d8\u91cf\u7684\u5185\u5b58\u5355\u5143\u4e4b\u4e2d\u7684\u3002\u5982x\u7684
\u5341\u8fdb\u5236ASCII\u7801\u662f120\uff0cy\u7684\u5341\u8fdb\u5236ASCII\u7801\u662f121\u3002\u5bf9\u5b57\u7b26\u53d8\u91cfa,b\u8d4b\u4e88'x'\u548c'y'\u503c\uff1a a='x';b='y';\u5b9e\u9645\u4e0a\u662f\u5728a,b\u4e24\u4e2a\u5355\u5143\u5185\u5b58\u653e120\u548c121\u7684\u4e8c\u8fdb\u5236\u4ee3\u7801\uff1a a 0 1 1 1 1 0 0 0
b 0 1 1 1 1 0 0 1
\u6240\u4ee5\u4e5f\u53ef\u4ee5\u628a\u5b83\u4eec\u770b\u6210\u662f\u6574\u578b\u91cf\u3002 C\u8bed\u8a00\u5141\u8bb8\u5bf9\u6574\u578b\u53d8\u91cf\u8d4b\u4ee5\u5b57\u7b26\u503c\uff0c\u4e5f\u5141\u8bb8\u5bf9\u5b57\u7b26\u53d8\u91cf\u8d4b\u4ee5\u6574\u578b\u503c\u3002\u5728\u8f93\u51fa\u65f6\uff0c \u5141\u8bb8\u628a\u5b57\u7b26\u53d8\u91cf\u6309\u6574\u578b\u91cf\u8f93\u51fa\uff0c\u4e5f\u5141\u8bb8\u628a\u6574\u578b\u91cf\u6309\u5b57\u7b26\u91cf\u8f93\u51fa\u3002 \u6574\u578b\u91cf\u4e3a\u4e8c\u5b57\u8282\u91cf\uff0c\u5b57\u7b26\u91cf\u4e3a\u5355\u5b57\u8282\u91cf\uff0c\u5f53\u6574\u578b\u91cf\u6309\u5b57\u7b26\u578b\u91cf\u5904\u7406\u65f6\uff0c \u53ea\u6709\u4f4e\u516b\u4f4d\u5b57\u8282\u53c2\u4e0e\u5904\u7406\u3002
main()
{
char a,b;
a=120;
b=121;
printf("%c,%c\n%d,%d\n",a,b,a,b);
}
a \u25a0 b \u25a0
a <-- 120
b <--- 121
\u663e\u793a\u7a0b\u5e8f\u7ed3\u679c
\u672c\u7a0b\u5e8f\u4e2d\u8bf4\u660ea\uff0cb\u4e3a\u5b57\u7b26\u578b\uff0c\u4f46\u5728\u8d4b\u503c\u8bed\u53e5\u4e2d\u8d4b\u4ee5\u6574\u578b\u503c\u3002\u4ece\u7ed3\u679c\u770b\uff0ca\uff0cb\u503c\u7684\u8f93\u51fa\u5f62\u5f0f\u53d6\u51b3\u4e8eprintf\u51fd\u6570\u683c\u5f0f\u4e32\u4e2d\u7684\u683c\u5f0f\u7b26\uff0c\u5f53\u683c\u5f0f\u7b26\u4e3a"c"\u65f6\uff0c\u5bf9\u5e94\u8f93\u51fa\u7684\u53d8\u91cf\u503c\u4e3a\u5b57\u7b26\uff0c\u5f53\u683c\u5f0f\u7b26\u4e3a"d"\u65f6\uff0c\u5bf9\u5e94\u8f93\u51fa\u7684\u53d8\u91cf\u503c\u4e3a\u6574\u6570\u3002
void main()
{
char a,b;
a='x';
b='y';
a=a-32;
b=b-32;
printf("%c,%c\n%d,%d\n",a,b,a,b);
}
a\uff0cb\u88ab\u8bf4\u660e\u4e3a\u5b57\u7b26\u53d8\u91cf\u5e76\u8d4b\u4e88\u5b57\u7b26\u503c
\u628a\u5c0f\u5199\u5b57\u6bcd\u6362\u6210\u5927\u5199\u5b57\u6bcd
\u4ee5\u6574\u578b\u548c\u5b57\u7b26\u578b\u8f93\u51fa
\u672c\u4f8b\u4e2d\uff0ca\uff0cb\u88ab\u8bf4\u660e\u4e3a\u5b57\u7b26\u53d8\u91cf\u5e76\u8d4b\u4e88\u5b57\u7b26\u503c\uff0cC\u8bed\u8a00\u5141\u8bb8\u5b57\u7b26\u53d8\u91cf\u53c2\u4e0e\u6570\u503c\u8fd0\u7b97\uff0c\u5373\u7528\u5b57\u7b26\u7684ASCII \u7801\u53c2\u4e0e\u8fd0\u7b97\u3002\u7531\u4e8e\u5927\u5c0f\u5199\u5b57\u6bcd\u7684ASCII \u7801\u76f8\u5dee32\uff0c\u56e0\u6b64\u8fd0\u7b97\u540e\u628a\u5c0f\u5199\u5b57\u6bcd\u6362\u6210\u5927\u5199\u5b57\u6bcd\u3002\u7136\u540e\u5206\u522b\u4ee5\u6574\u578b\u548c\u5b57\u7b26\u578b\u8f93\u51fa\u3002
[Practice] //charint a=49;
char b;
char d;
b=a+10;
d=a+b;'Vtable
a,2,49
b,1,\u968f\u673a
d,1,\u968f\u673a
of Vtable
'Vupdate
1,49
2,\u968f\u673a
3,\u968f\u673a
2,';'
3,'l'
of Vupdate
of Practice
[Practice] //char c1,c2;
c1='a';c2='b';
c1=c1-32;c2=c2-32;'Vtable
c1,1,\u968f\u673a
c2,1,\u968f\u673a
of Vtable
'Vupdate
1,\u968f\u673a;2,\u968f\u673a
1,'a';2,'b'
1,'A';2,'B'
of Vupdate
of Practice
\u5b57\u7b26\u4e32\u5e38\u91cf
\u5b57\u7b26\u4e32\u5e38\u91cf\u662f\u7531\u4e00\u5bf9\u53cc\u5f15\u53f7\u62ec\u8d77\u7684\u5b57\u7b26\u5e8f\u5217\u3002\u4f8b\u5982\uff1a "CHINA" \uff0c"C program:" \uff0c "$12.5" \u7b49\u90fd\u662f\u5408\u6cd5\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u3002\u5b57\u7b26\u4e32\u5e38\u91cf\u548c\u5b57\u7b26\u5e38\u91cf\u662f\u4e0d\u540c\u7684\u91cf\u3002\u5b83\u4eec\u4e4b\u95f4\u4e3b\u8981\u6709\u4ee5\u4e0b\u533a\u522b\uff1a
1.\u5b57\u7b26\u5e38\u91cf\u7531\u5355\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u7531\u53cc\u5f15\u53f7\u62ec\u8d77\u6765\u3002
2.\u5b57\u7b26\u5e38\u91cf\u53ea\u80fd\u662f\u5355\u4e2a\u5b57\u7b26\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u5219\u53ef\u4ee5\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u3002
3.\u53ef\u4ee5\u628a\u4e00\u4e2a\u5b57\u7b26\u5e38\u91cf\u8d4b\u4e88\u4e00\u4e2a\u5b57\u7b26\u53d8\u91cf\uff0c\u4f46\u4e0d\u80fd\u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf\u8d4b\u4e88\u4e00\u4e2a\u5b57\u7b26\u53d8\u91cf\u3002\u5728C\u8bed\u8a00\u4e2d\u6ca1\u6709\u76f8\u5e94\u7684\u5b57\u7b26\u4e32\u53d8\u91cf\u3002
\u8fd9\u662f\u4e0eBASIC \u8bed\u8a00\u4e0d\u540c\u7684\u3002\u4f46\u662f\u53ef\u4ee5\u7528\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u6765\u5b58\u653e\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf\u3002\u5728\u6570\u7ec4\u4e00\u7ae0\u5185\u4e88\u4ee5\u4ecb\u7ecd\u3002
4.\u5b57\u7b26\u5e38\u91cf\u5360\u4e00\u4e2a\u5b57\u8282\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u5b57\u7b26\u4e32\u5e38\u91cf\u5360\u7684\u5185\u5b58\u5b57\u8282\u6570\u7b49\u4e8e\u5b57\u7b26\u4e32\u4e2d\u5b57\u8282\u6570\u52a01\u3002\u589e\u52a0\u7684\u4e00\u4e2a\u5b57\u8282\u4e2d\u5b58\u653e\u5b57\u7b26"\0"(ASCII\u7801\u4e3a0)\u3002\u8fd9\u662f\u5b57\u7b26\u4e32\u7ed3\u675f\u7684\u6807\u5fd7\u3002\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32 "C program"\u5728\u5185\u5b58\u4e2d\u6240\u5360\u7684\u5b57\u8282\u4e3a\uff1aC program\0\u3002\u5b57\u7b26\u5e38\u91cf'a'\u548c\u5b57\u7b26\u4e32\u5e38\u91cf"a"\u867d\u7136\u90fd\u53ea\u6709\u4e00\u4e2a\u5b57\u7b26\uff0c\u4f46\u5728\u5185\u5b58\u4e2d\u7684\u60c5\u51b5\u662f\u4e0d\u540c\u7684\u3002
'a'\u5728\u5185\u5b58\u4e2d\u5360\u4e00\u4e2a\u5b57\u8282\uff0c\u53ef\u8868\u793a\u4e3a\uff1aa
"a"\u5728\u5185\u5b58\u4e2d\u5360\u4e8c\u4e2a\u5b57\u8282\uff0c\u53ef\u8868\u793a\u4e3a\uff1aa\0\u7b26\u53f7\u5e38\u91cf
\u7b26\u53f7\u5e38\u91cf
\u5728C\u8bed\u8a00\u4e2d\uff0c\u53ef\u4ee5\u7528\u4e00\u4e2a\u6807\u8bc6\u7b26\u6765\u8868\u793a\u4e00\u4e2a\u5e38\u91cf\uff0c\u79f0\u4e4b\u4e3a\u7b26\u53f7\u5e38\u91cf\u3002\u7b26\u53f7\u5e38\u91cf\u5728\u4f7f\u7528\u4e4b\u524d\u5fc5\u987b\u5148\u5b9a\u4e49\uff0c\u5176\u4e00\u822c\u5f62\u5f0f\u4e3a\uff1a
#define \u6807\u8bc6\u7b26 \u5e38\u91cf
\u5176\u4e2d#define\u4e5f\u662f\u4e00\u6761\u9884\u5904\u7406\u547d\u4ee4\uff08\u9884\u5904\u7406\u547d\u4ee4\u90fd?quot;#"\u5f00\u5934\uff09\uff0c\u79f0\u4e3a\u5b8f\u5b9a\u4e49\u547d\u4ee4\uff08\u5728\u7b2c\u4e5d\u7ae0\u9884\u5904\u7406\u7a0b\u5e8f\u4e2d\u5c06\u8fdb\u4e00\u6b65\u4ecb\u7ecd\uff09\uff0c\u5176\u529f\u80fd\u662f\u628a\u8be5\u6807\u8bc6\u7b26\u5b9a\u4e49\u4e3a\u5176\u540e\u7684\u5e38\u91cf\u503c\u3002\u4e00\u7ecf\u5b9a\u4e49\uff0c\u4ee5\u540e\u5728\u7a0b\u5e8f\u4e2d\u6240\u6709\u51fa\u73b0\u8be5\u6807\u8bc6\u7b26\u7684\u5730\u65b9\u5747\u4ee3\u4e4b\u4ee5\u8be5\u5e38\u91cf\u503c\u3002\u4e60\u60ef\u4e0a\u7b26\u53f7\u5e38\u91cf\u7684\u6807\u8bc6\u7b26\u7528\u5927\u5199\u5b57\u6bcd\uff0c\u53d8\u91cf\u6807\u8bc6\u7b26\u7528\u5c0f\u5199\u5b57\u6bcd\uff0c\u4ee5\u793a\u533a\u522b\u3002
#define PI 3.14159
void main()
{
float s,r;
r=5;
s=PI*r*r;
printf("s=%f\n",s);
}
\u7531\u5b8f\u5b9a\u4e49\u547d\u4ee4\u5b9a\u4e49PI \u4e3a3.14159 s,r\u5b9a\u4e49\u4e3a\u5b9e\u6570 5->r PI*r*r->s
\u663e\u793a\u7a0b\u5e8f\u7ed3\u679c float s,r; r=5; s=PI*r*r; \u672c\u7a0b\u5e8f\u5728\u4e3b\u51fd\u6570\u4e4b\u524d\u7531\u5b8f\u5b9a\u4e49\u547d\u4ee4\u5b9a\u4e49PI \u4e3a3.14159\uff0c\u5728\u7a0b\u5e8f\u4e2d\u5373\u4ee5\u8be5\u503c\u4ee3\u66ffPI \u3002s=PI*r*r\u7b49\u6548\u4e8es=3.14159*r*r\u3002\u5e94\u8be5\u6ce8\u610f\u7684\u662f\uff0c\u7b26\u53f7\u5e38\u91cf\u4e0d\u662f\u53d8\u91cf\uff0c\u5b83\u6240\u4ee3\u8868\u7684\u503c\u5728\u6574\u4e2a\u4f5c\u7528\u57df\u5185\u4e0d\u80fd\u518d\u6539\u53d8\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u7a0b\u5e8f\u4e2d\uff0c\u4e0d\u80fd\u518d\u7528\u8d4b\u503c\u8bed\u53e5\u5bf9\u5b83\u91cd\u65b0\u8d4b\u503c\u3002
\u4f1a\u62a5\u9519\uff0c\u8bf4\u4f60\u5f15\u7528\u7684\u8fd9\u4e2a\u53d8\u91cf\u6ca1\u6709\u5b9a\u4e49\uff0c\u5c31\u8fd9\u4e48\u7b80\u5355\u3002
全局静态变量在全局变量之前加上关键字static，全局变量就被定义成为一个全局静态变量。
如 static int a;
1）内存中的位置：静态存储区（静态存储区在整个程序运行期间都存在）
2）初始化：未经初始化的全局静态变量会被程序自动初始化为0（自动对象的值是任意的，除非他被显示初始化）
3）作用域：全局静态变量在声明他的文件之外是不可见的。准确地讲从定义之处开始到文件结尾。
定义全局静态变量的好处：
<1>不会被其他文件所访问，修改
<2>其他文件中可以使用相同名字的变量，不会发生冲突。
绛旓細鐒惰岋紝瀵逛簬C璇█瀹舵棌锛岀壒鍒槸C璇█锛"闈欐佸彉閲"鏈変竴涓壒瀹氱殑鍚箟锛屽嵆浣跨敤"static"瀛樺偍绫诲埆澹版槑鐨勫彉閲忋傝繖浜涘彉閲忓湪绋嬪簭杩愯鏈熼棿淇濇寔鍏剁姸鎬侊紝鍗充娇鍑芥暟缁撴潫涔熶笉琚攢姣併傚湪鍍廝ascal杩欐牱鐨璇█涓紝鎯呭喌鏈夋墍涓嶅悓銆傜敱浜庡畠浠嚜鍔ㄤ负灞閮ㄥ彉閲忓垎閰嶅唴瀛橈紝鑰鍏ㄥ眬鍙橀噺鍒欓氳繃闈欐佹柟寮忓垎閰嶏紝"闈欐佸彉閲"杩欎釜鏈骞朵笉甯哥敤锛岄氬父...
绛旓細static 鐢ㄦ潵璇存槑闈欐佸彉閲銆1銆佸鏋滄槸鍦ㄥ嚱鏁板闈㈠畾涔夌殑锛岄偅涔堝叾鏁堟灉鍜鍏ㄥ眬鍙橀噺绫讳技锛屽嵆static璇存槑鐨勫彉閲忓彲浠ュ湪褰撳墠c绋嬪簭鏂囦欢涓娇鐢ㄣ2銆佸鏋滄槸鍦ㄥ嚱鏁板唴閮ㄥ畾涔夌殑锛岄偅涔堣繖涓彉閲忓彧鍒濆鍖栦竴娆★紝鍗充娇鍐嶆璋冪敤杩欎釜鍑芥暟锛岃繖涓static鍙橀噺涔熶笉浼氬啀娆¤鍒濆鍖栵紝浜庢槸锛岃繖涓彉閲忕殑鍙栧煎氨浼氫竴鐩翠繚瀛樼潃锛屾垜浠啀娆¤皟鐢ㄨ鍑芥暟鏃...
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绛旓細static 鐢ㄦ潵璇存槑闈欐佸彉閲銆傚鏋滄槸鍦ㄥ嚱鏁板闈㈠畾涔夌殑锛岄偅涔堝叾鏁堟灉鍜鍏ㄥ眬鍙橀噺绫讳技锛屼絾鏄紝static瀹氫箟鐨勫彉閲忓彧鑳藉湪褰撳墠c绋嬪簭鏂囦欢涓娇鐢紝鍦ㄥ彟涓涓猚浠ｇ爜閲岄潰锛鍗充娇浣跨敤extern鍏抽敭璇嶄篃涓嶈兘璁块棶杩欎釜static鍙橀噺銆傚鏋滄槸鍦ㄥ嚱鏁板唴閮ㄥ畾涔夌殑锛岄偅涔堣繖涓彉閲忓彧鍒濆鍖栦竴娆°C璇█鏄涓闂ㄩ氱敤璁＄畻鏈虹紪绋嬭瑷锛屽簲鐢ㄥ箍娉涖侰璇█鐨...
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