加入 #include <math.h>搜尋 math.h 就可以找到一些範例/* sin example */#include <stdio.h>#include <math.h>#define PI 3.14159265int main (){double param, result;param = 30.0;result = sin (param*PI/180);printf ("The sine of %lf degrees is %lf.\n", param, result );return 0;}