#include<stdio.h>
#include<stdlib.h>
int    sum(int x,int y)
{
        int   l,k,h,m;
        l=x+y;
        k=x*y;
        h=x-y;
        m=x/y;
        return  l;
        return  k;
        return h;
        return m;
}
main()
{
        int   j,a,b,k,p,i,u,g;
            for(j=0;j<40;j++)
            {
                a=rand()%100;
                b=rand()%100;
            }
            for(g=0;g<10;g++)
            {
                printf("%d+%d=",a,b);
                scanf("%d",&k);
                if(k==sum(a,b))
                    printf("正确\n");
                else   
                    printf("错误\n");
                printf("%d*%d=",a,b);
                scanf("%d",&p);
                    if(p==sum(a,b))
                    printf("正确\n");
                else   
                    printf("错误\n");
                printf("%d/%d=\n",a,b);
                    scanf("%d",&i);
                        if(i==sum(a,b))
                    printf("正确\n");
                else   
                    printf("错误\n");
            printf("%d-%d=",a,b);
                scanf("%d",&u);
                if(u==sum(a,b))
                    printf("正确\n");
                else   
                    printf("错误\n");
               
            }





}