P122.41

/* Note:Your choice is C IDE */

#include "stdio.h"

int prim(int num)

{ int a=0,i;

for(i=2;i<num;i++)

{

if(num%i==0)

a=a+1;

}

return a;

}

void main()

{

int num,i,j,b=0;

do

{printf("请输入一个比2大的偶数:\n");

scanf("%d",&num);

if(num%2!=0||num<=2)

printf("Wrong!!请重新输入\n");

}while(num%2!=0);

for(i=1;i<100;i++)

{

for(j=1;j<=i;j++)

{

if(i+j==num)

{

if((prim(i)==0)&&(prim(j)==0))

{

printf("%d + %d = %d\n",i,j,num);

b++;

}

}

}

}

if(b>0)printf("歌德巴猜想是正确的！\n");

else printf("歌德巴猜想是错误的！\n");

}