VC: Enter a number, it is determined whether it is a prime number

#include "stdio.h"
#include "math.h"
void main()
{
  int i=2,m=1,k=1;
  printf("请输入数字：");
  scanf("%d",&m);
  k=sqrt((double)m);
  for(;i<=k;i++)
  {
    if(m%i==0)
        break;
  }
  if(i>k)
  {
  printf("Is a prime number " ); 
  } 
  the else 
  { 
  the printf ( " not a prime number " ); 
  } 
}