#include "stdio.h"
#include "math.h"
main()
{
double x,s;
printf("input number:\n");
scanf("%lf",&x);
s=sin(x);
printf("sine of %lf is %lf\n",x,s);
}
是什么意思啊......我看不懂啊....求救!!!

什么叫做正弦值????????

嘿嘿...谢谢了各位!!!