#include "stdafx.h"

#include<stdio.h>

#include<stdlib.h>

int main(int argc, char* argv[])

{

int i,j,k,sum;

for(int t = 0;t<30;t++)

{

printf("第%d道题：",t+1);

i = rand()%50;

j = rand()%50;

k = rand()%4;

switch(k)

{

case 0:

sum = i+j;

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

break;

case 1:

sum = i-j;

printf("%d-%d=%d\n",i,j,sum);

break;

case 2:

sum = i*j;

printf("%d*%d=%d\n",i,j,sum);

break;

case 3:

sum = i/j;

printf("%d/%d=%d\n",i,j,sum);

break;

default:

printf("出错！\n");

break;

}

}

return 0;

}