第三章第41题

#include<stdio.h>#include<math.h>int prim(int num){int i,j=0;for(i=2;i<=sqrt(num);i++){if(num%i==0)j++;}if(j==0)return 1;elsereturn 0;}int gdbh(int x){int i;for(i=2;i<=x/2;i++){if(prim(i)&&prim(x-i)!=0)break;}    printf("现在验证：%d=%d+%d\n",x,i,x-i);return 0;}int main(){int a;while(1){printf("请输入一个大于2的偶数:");scanf("%d",&a);gdbh(a);}return 0;}