#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(void)
{
int i = 0;
srand((unsigned)time(NULL)); //本地时间为种子
while(i<30)
{
int a = rand()%100; //产生随机数
int b = rand()%100;
int j;
j = rand()%4; //产生随机符号0到3分别代表四则运算
printf("%d", a);
switch(j)
{
case 0:
printf("+");
break;
case 1:
printf("-");
break;
case 2:
printf("*");
break;
case 3:
printf("/");
break;
}
printf("%d", b);
printf(" = \n");
i++;
}
return 0;
}