输入一个数 判断是否为素数

#include<stdio.h>

#include<math.h>

int main()

{

 int i, k, m;

 void prin(); 

 prin();

 while(scanf("%d",&m)!=EOF)

 {

 　　k=sqrt(m);

 　　for(i=2;i<=k;i++)

      {  

         if(m%i==0)  

            {  

               break;

            }    

      }  

           if(i>k)  

                    printf("%d is a sushu\n",m);

           else

                   printf("%d is not a sushu\n",m);            

                 prin();

          }     

               return 0;

  }

            void prin()

                {  

                    printf("Please input a number:\n");

               }

转载于:https://www.cnblogs.com/lMercury/archive/2013/03/16/2963239.html