新手求教：: `sin' was not declared in this scope
#include#include
main()
{
double x,s;
printf("input number:\n");
scanf("%lf",&x);
s=sin(x);
printf("sine of %lf is %lf\n",x,s);
}
[Error] C:\Users\Administrator\Documents\C-Free\Temp\未命名1.cpp:11: error: `sin' was not declared in this scope
