C語言函數大全(c開頭)
函數名:cabs
函數:計算複數的絕對值
用法:double cabs(struct complex z);
程序示例:
# include
# include
int main(void)
{
struct complex z;
double val;
z . x = 2.0;
z . y = 1.0;
val = cabs(z);
printf(" . 2 lfi %.2lfj的絕對值爲% . 2 lf",z.x,z.y,val);
返廻0;
}
函數名:calloc
函數:分配主存
用法:void * calloc (size _ tenelem,size _ telsize);
程序示例:
# include
# include
int main(void)
{
char * str = null;
str = calloc(10,sizeof(char))分配內存;
strcpy(str," Hello");
printf(" String is % s \ n",str);
free(str);
返廻0;
}
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