#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);
}
为什么用VC++6.0时会出现 “printf scanf定义错误”　

void main()
and no mistakes

#include "stdafx.h"
#include "stdio.h"
#include "math.h"

void main()
{
double x,s;
printf("input number:\n");
scanf("%lf",&x);
s=sin(x);
printf("sine of %lf is %lf\n",x,s);
}