在C语言中fomd函数的功能。 C语言*a什么意思
C\u8bed\u8a00A++ ++A \u7684\u610f\u601d\C\u8bed\u8a00!=\u7684\u610f\u601dA++\u662fA\u53c2\u4e0e\u8fd0\u7b97\u540e\uff0cA\u7684\u503c\u518d\u81ea\u589e1\u3002
++A \u662fA\u81ea\u589e1\u540e\u518d\u53c2\u4e0e\u5176\u5b83\u8fd0\u7b97\u3002
!=\u8868\u793a\u4e0d\u7b49\u4e8e\u3002
\u4f8b\uff1a
\u5bf9\u4e8e\u4ee5\u4e0b\uff0c\u6709int x = 5, y = 6, z;z = ++x + y++;
\u4f7f\u7528\u7684\u6280\u5de7\u5c31\u662f\uff1a\u628a\u539f\u59cb\u8ba1\u7b97\u5f0f\u8f6c\u5316\u6210\u591a\u4e2a\u3001\u6709\u5148\u540e\u8ba1\u7b97\u987a\u5e8f\u7684\u3001\u5c0f\u7684\u8ba1\u7b97\u5f0f\uff0c\u7136\u540e\u5e26\u5165\u53d8\u91cf\u7684\u503c\uff0c\u8fdb\u884c\u6c42\u89e3\u3002\u8bb0\u4f4f\uff1a\u540c\u4e00\u4f18\u5148\u7ea7\u7684\u8fd0\u7b97\u7b26\u7684\u8ba1\u7b97\u987a\u5e8f\u662f\u4ece\u53f3\u5f80\u5de6\u3002
z = ++x + y++; \u53ef\u4ee5\u8f6c\u5316\u4e3a:
x = x +1;
z = x + y;
y = y + 1;
\u5e26\u5165x = 5, y = 6\uff0c\u53ef\u5f97x = 6; z = 12; y = 7;
\u6269\u5c55\u8d44\u6599
A++ \u548c++A \u7684\u4e3b\u8981\u533a\u522b\u662f\u81ea\u589e\u7684\u987a\u5e8f\uff0c++\u5728\u53d8\u91cf\u524d\u8868\u793a\u5148\u8fdb\u884c\u81ea\u589e\u8fd0\u7b97\uff0c\u5373\u53d8\u91cf\u7684\u503c\u52a01\u3002++\u5728\u53d8\u91cf\u540e\u5219\u8fdb\u884c\u8fd0\u7b97\u540e\u518d\u8fdb\u884c\u81ea\u589e\u8fd0\u7b97\u3002
\u5728\u540c\u4e00\u6761\u8bed\u53e5\u4e2d\uff0c\u88ab\u64cd\u4f5c\u7684\u6570\u51fa\u73b0\u591a\u6b21\u662f\u53ef\u4ee5\u901a\u8fc7\u7f16\u8bd1\u7684\uff0c\u4f46\u662f\u5176\u5728C++ Standard\u7b49\u8bed\u8a00\u6807\u51c6\u4e2d\u88ab\u5b9a\u4e49\u4e3a"Undefined behavior"\uff08\u4e0d\u786e\u5b9a\u7684\u884c\u4e3a\uff09\uff0c\u5373\u4e0d\u540c\u7684\u7f16\u8bd1\u5668\u6216\u7f16\u8bd1\u5668\u7248\u672c\u6240\u7f16\u8bd1\u5f97\u5230\u7684\u673a\u5668\u7801\u53ef\u80fd\u4e0d\u5c3d\u76f8\u540c\u3002
\u4e0d\u63a8\u8350\u5728\u540c\u4e00\u6761\u8bed\u53e5\u4e2d\u4f7f\u88ab\u64cd\u4f5c\u7684\u6570\u51fa\u73b0\u591a\u6b21\uff0c\u8fd9\u4e0d\u4ec5\u4ec5\u5c06\u5bfc\u81f4\u7a0b\u5e8f\u7684\u542b\u4e49\u96be\u4ee5\u7406\u89e3\uff0c\u53ef\u8bfb\u6027\u5927\u5e45\u964d\u4f4e\uff0c\u540c\u65f6\u53ef\u80fd\u5bfc\u81f4\u4e0d\u540c\u7684\u7f16\u8bd1\u5668\u6216\u7f16\u8bd1\u5668\u7248\u672c\u5f97\u5230\u4e0d\u540c\u7684\u7ed3\u679c\u3002
\u524d\u7f6e\u540e\u7f6e\u533a\u522b\u7684\u4e3e\u4f8b\uff1a
a = i++;
\u76f8\u5f53\u4e8e a = i; i++;
a = ++i;
\u76f8\u5f53\u4e8e i++; a = i;
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1\u2014\u2014\u81ea\u589e\u81ea\u51cf\u8fd0\u7b97\u7b26
\u5f53a\u662f\u4e00\u4e2a\u6307\u9488\u7684\u65f6\u5019\uff0c*a\u5c31\u662f\u8fd9\u4e2a\u6307\u9488\u6307\u5411\u7684\u5185\u5b58\u7684\u503c
\u5728\u5b9a\u4e49\u7684\u65f6\u5019\u52a0\u4e86*\u7684\u90fd\u662f\u6307\u9488\u53d8\u91cf\uff0c\u90fd\u662f\u4e00\u4e2a\u5730\u5740\u3002
\u5728\u8d4b\u503c\u7684\u65f6\u5019\u52a0\u4e86*\u7684\u90fd\u662f\u8868\u793a\u8fd9\u4e2a\u6307\u9488\u6307\u5411\u5185\u5b58\u7684\u503c\uff0c\u5728\u7b49\u53f7\u524d\u9762\u5c31\u662f\u7ed9\u8fd9\u4e2a\u503c\u8d4b\u503c\uff0c\u540e\u9762\u5c31\u662f\u53d6\u8fd9\u4e2a\u503c
功 能: 计算x对y的模, 即x/y的余数
用 法: double fmod(double x, double y);
程序例:
#include <stdio.h>
#include <math.h>
int main(void)
{
double x = 5.0, y = 2.0;
double result;
result = fmod(x,y);
printf("The remainder of (%lf / %lf) is \
%lf\n", x, y, result);
return 0;
}
绛旓細鍑芥暟鍚: fmod 鍔 鑳: 璁＄畻x瀵箉鐨勬ā, 鍗硏/y鐨勪綑鏁 鐢 娉: double fmod(double x, double y);绋嬪簭渚:include <stdio.h> include <math.h> int main(void){ double x = 5.0, y = 2.0;double result;result = fmod(x,y);printf("The remainder of (%lf / %lf) is \ lf\...
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