#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <math.h>
main()
{
    int data1,data2,i;
    int count=0;
    int reply;

    srand(time(NULL));

    while( count < 10 )
    {
        i=rand()%4+1;

        switch(i)
        case 1:
        {
            data1=rand()%11;
            data2=rand()%11;

            printf("%d+%d=",data1,data2);
            scanf("%d",&reply);
        }
            break;

        case 2:
        {
            data1=rand()%11;
            data2=rand()%11;

            while (data1<data2)
            {
                data1=rand()%11;
                data2=rand()%11;
            }
            printf("%d-%d=",data1,data2);
            scanf("%d",&reply);
        }
            break;

        case 3:
        {
            data1=rand()%11;
            data2=rand()%11;

            printf("%d*%d=",data1,data2);
            scanf("%d",&reply);
        }
            break;

        case 4:
        {
            data1=rand()%11;
            data2=rand()%11;

            while(data2==0)
            {
                data1=rand()%11;
                data2=rand()%11;
            }

            while(data2!=0)
            {
                int x=fmod(data1,data2);
                while(x!=0)
                {
                    data1=rand()%11;
                    data2=rand()%11;
                }
            }

            printf("%d/%d=",data1,data2);
            scanf("%d",&reply);
        }
            break;

        count++;
    }
  }