30道四则运算题

Posted 2021-01-11 mashijie605023237

#include<stdio.h>
#include<stdlib.h>
void main()
{
int a, b, c, d, e, i, j;
srand(NULL);
printf("四则运算题: ");
for (i = 0; i < 30; i++)
{
a = rand() % 100;
b = rand() % 100;
c = rand() % 4;
switch (c)
{
case 0:
if (a < b)
{
printf("%d-%d= ", b, a);
}
else
printf("%d-%d= ", a, b);
break;
case 1:
printf("%d+%d= ", a, b);
break;
case 2:
printf("%d*%d= ", a, b);
break;
case 3:
{
d = rand() % 20;
if (d != 0)
e = rand() % 4;
switch (e)
{
case 0:
printf("0÷%d= ", d);
break;
case 1:
printf("%d÷%d= ", d, d);
break;
case 2:
j = 2 * d;
printf("%d÷%d= ", j, d);
break;
case 3:
j = 3 * d;
printf("%d÷%d= ", j, d);
break;
}
break;
}
}
}
system("pause");
}