#include<stdio.h>
#include<stdlib.h>
#define MAX 10 //宏定义//
#define N 4
void menu();
void main()
{
menu(); //开头的
int a = 0, b = 0, r = 0;
int i = 0, n = 0, flag;
int right = 0, wrong = 0;
printf("请输入的题个数:");
scanf("%d", &n);
for(flag = 0; flag < n; flag++)
{
a = (int)(rand()%MAX); /*随即产生 a*/
b = (int)(rand()%MAX); /*随即产生 b*/
i = rand()%N; /*随即产生符号，0 加 1 减 2 乘 3 除*/
switch(i)
{
case 0 : /*加法*/
printf(" %d + %d = ", a,b);
scanf("%d", &r);
if(r == (a + b))
{
printf(" 恭喜你答对了!");
right++;
}
else
{
printf(" 答错了，再接再励! %d + %d = %d",a, b, a + b);
wrong++;
}
break;
case 1 : /*减法*/
printf(" %d - %d = ", a,b);
scanf("%d", &r);
if(r == (a - b))
{
printf(" 恭喜你答对了!");
right++;
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