二十五岁时我们都一样愚蠢、多愁善感，喜欢故弄玄虚，可如果不那样的话，五十岁时也就不会如此明智。
标题：C库函数 cos()
C库函数 cos()
#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); }
