编程学习网为您整理以下代码实例，主要实现：C语言库cos()函数，希望可以帮到各位朋友。
#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main () {
double x, ret, val;
x = 60.0;
val = PI / 180.0;
ret = cos( x*val );
printf("The cosine of %lf is %lf degrees\n", x, ret);
x = 90.0;
val = PI / 180.0;
ret = cos( x*val );
printf("The cosine of %lf is %lf degrees\n", x, ret);
return(0);
}
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