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   请写出是哪本书哪章哪个实例 我这边运行一下

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
{
    int a,b,c,d,flag=0;
    scanf("%d",&a);
    for(b=3;b<=a/2;b+=2)
    {
        for(c=2;c<=sqrt(b);c++)
        {
            if(b%c==0)
            {
                break;
            }
            if(c>sqrt(b))
            {
                d=c-b;
            }
            else
            {
                continue;
            }
        }
        for(c=2;c=sqrt(d);c++)
        {
            if(d%c==0)
            {
                break;
            }
            if(c>sqrt(d))
            {
                printf("%d=%d+%d\n",a,b,d);
                flag=1;
            }
            break;
        }
    }
    if(flag==0)
    {
        printf("cant's !\n");
    }

    return 0;
}

c语言从入门到精通104页列5.12