#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
 int x, y, z, t,i;
srand(time(NULL));
printf("小学三年级四则运算练习题\n");
for (i = 0; i <100; i++)
{
 x = rand() % 100;
 y = rand() % 100;
 z = rand() % 4;
 printf("%d", x);
 switch (z)
 {
 case 0:printf("+"); break;
 case 1:printf("-"); break;
 case 2:printf("*"); break;
 case 3:printf("/"); break;
 }
 printf("%d=\n", y);

system("pause");
}

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