C语言：如何判断输入的是数字还是其他字符 C语言 输入一个字符，判断该字符是数字、字母、空格还是其他字...
c\u8bed\u8a00 \u5982\u4f55\u5224\u65ad\u8f93\u5165\u7684\u662f\u6570\u5b57\u8fd8\u662f\u5b57\u6bcd\u9700\u8981\u51c6\u5907\u7684\u6750\u6599\u5206\u522b\u6709\uff1a\u7535\u8111\u3001C\u8bed\u8a00\u7f16\u8bd1\u5668\u3002
1\u3001\u9996\u5148\uff0c\u6253\u5f00C\u8bed\u8a00\u7f16\u8bd1\u5668\uff0c\u65b0\u5efa\u4e00\u4e2a\u521d\u59cb\u7684.cpp\u6587\u4ef6\uff0c\u4f8b\u5982\uff1atest.cpp\u3002
2\u3001\u5176\u6b21\uff0c\u5728test.cpp\u6587\u4ef6\u4e2d\uff0c\u8f93\u5165C\u8bed\u8a00\u4ee3\u7801\uff1achar a = getchar(); getchar();
if (a = '0') printf("\u6570\u5b57");else printf("\u5b57\u6bcd");
3\u3001\u7136\u540e\uff0c\u7f16\u8bd1\u5668\u8fd0\u884ctest.cpp\u6587\u4ef6\uff0c\u8f93\u5165\u6570\u5b57\uff0c\u6b64\u65f6\u4f1a\u6210\u529f\u5224\u65ad\u8f93\u5165\u5185\u5bb9\u4e3a\u6570\u5b57\u3002
4\u3001\u6700\u540e\uff0c\u8f93\u5165\u5b57\u6bcd\uff0c\u6b64\u65f6\u6210\u529f\u5224\u65ad\u4e86\u8f93\u5165\u5185\u5bb9\u4e3a\u5b57\u6bcd\u3002
\u4e09\u4e2a\u7a7a\u5206\u522b\u662f\uff1a
1\u3001ch >= 'a'&&ch='A'&&ch<='Z'
2\u3001 ch >= '0' && ch<='9'
3\u3001 ch == ' '
4\u3001\u5b8c\u6574\u4ee3\u7801
#include
#include int main(){ char ch;
printf("Please enter a char:");
while((ch=getchar())!=EOF) {
if(ch>='0'&&ch<='9') {
printf("%c\u662f\u6570\u5b57\u5b57\u7b26\uff1a",ch); }
else if(ch>='a'&&ch<='z') {
printf("%c\u662f\u5c0f\u5199\u5b57\u6bcd:",ch); }
else if(ch>='A'&&ch<='Z') {
printf("%c\u662f\u5927\u5199\u5b57\u6bcd:",ch); }
else if(ch==' ') {
printf("%c\u662f\u7a7a\u683c:",ch); }
else {
printf("%c\u662f\u5176\u5b83\u5b57\u7b26:",ch); }
} return 0;}
\u6269\u5c55\u8d44\u6599
C\u8bed\u8a00\u7279\u6709\u7279\u70b9
1\u3001C\u8bed\u8a00\u662f\u4e00\u4e2a\u6709\u7ed3\u6784\u5316\u7a0b\u5e8f\u8bbe\u8ba1\u3001\u5177\u6709\u53d8\u91cf\u4f5c\u7528\u57df\uff08variable scope\uff09\u4ee5\u53ca\u9012\u5f52\u529f\u80fd\u7684\u8fc7\u7a0b\u5f0f\u8bed\u8a00\u3002
2\u3001C\u8bed\u8a00\u4f20\u9012\u53c2\u6570\u5747\u662f\u4ee5\u503c\u4f20\u9012\uff08pass by value\uff09\uff0c\u53e6\u5916\u4e5f\u53ef\u4ee5\u4f20\u9012\u6307\u9488\uff08a pointer passed by value\uff09\u3002
3\u3001\u4e0d\u540c\u7684\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u7528\u7ed3\u6784\u4f53\uff08struct\uff09\u7ec4\u5408\u5728\u4e00\u8d77\u3002
4\u3001\u53ea\u670932\u4e2a\u4fdd\u7559\u5b57\uff08reserved keywords\uff09\uff0c\u4f7f\u53d8\u91cf\u3001\u51fd\u6570\u547d\u540d\u6709\u66f4\u591a\u5f39\u6027\u3002
\u53c2\u8003\u8d44\u6599
\u767e\u5ea6\u767e\u79d1-C\u8bed\u8a00
1、可以用sacnf或gets函数直接接收输入的字符串，然后用循环遍历字符串中每一个字符，判断其是字母还是数字。
2、可以用循环调用getch()或getchar()函数来一个一个字符的接收输入，同时判读输入的是字母还是数字。
至于怎么判读是字母还是数字，很简单，假设字符c,
满足 (c>='a'&& c<='z'）|| (c>='A' && c<='Z'）就是字母。
满足 (c>='0' && c<='9'）就是数字。
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