用c++编程四则运算考题。随机产生指定范围的数，显示每道的回答结果、得分及正确答案。

Question

每次10道，每道2分，要求：减法的结果为正，除法结果为整数。
用c++程序，特别急，谢谢

Answer 1

#include <iostream>
using namespace std;
#include <time.h>
#include <vector>

//定义表达式
struct Expression
{
int iFirst; //第一个操作数
int iSecond; //第二个操作数
char oper; //操作

int result; //结果

//初始化
Expression()
{
iFirst = 0;
iSecond = 0;
oper = 0;
result = 0;

}
};

//随机数的上下限
int low = 0,up = 0;

//vector，存储生成的表达式
vector<Expression> vector_Expression;

//生成该操作类的表达式的函数
void SetExpression(char oper);

int main()
{
cout<<"请输入随机数的下限和上限！"<<endl;
cin>>low>>up;
if (low > up)
{
cout<<"下限大于上限，已自动转换!"<<endl;

int temp = low;
low = up;
up = temp;
}

srand(time(NULL));

//随机生成十道题目
char operSymb[4] = {'+','-','*','/'};
char oper;
for (int i = 0; i < 10; ++i)
{
oper = operSymb[rand()%4];
SetExpression(oper);
}

cout<<"本次测试一共十道题目，请依次作答！"<<endl;

int Score = 0;
//迭代器依次访问vector数组元素
vector<Expression>::iterator iter = vector_Expression.begin();
for (iter; iter != vector_Expression.end(); ++iter)
{
cout<<iter->iFirst<<iter->oper<<iter->iSecond<<"=";
int result;
cin>>result;

if (result != iter->result)
cout<<"很遗憾回答错误，本题得分：0，正确答案为"<<iter->result<<endl;
else
{
cout<<"恭喜你回答正确，本题得分：10"<<endl;

Score += 10;
}

cout<<endl;
}

cout<<"测试结束，你总共得分为："<<Score<<endl;

}

void SetExpression(char oper)
{
int iFirst = 0;
int iSecond = 0;

//获取两个操作数
if (oper != '/')
{
//生成两数
iFirst = rand()%(up - low) + low;
iSecond = rand()%(up - low) + low;

if (oper == '-' && iFirst < iSecond)
{
int temp = iSecond;
iSecond = iFirst;
iFirst = temp;
}
}
else if (oper == '/')
{
//最大循环次数,防止死循环
int count = 0;
while (1)
{
count++;
if (count == 10000)
break;

iFirst = rand()%(up - low) + low;
iSecond = rand()%(up - low) + low;

if (iFirst < iSecond)
{
int temp = iSecond;
iSecond = iFirst;
iFirst = temp;
}

if (iSecond == 0)
continue;

if ((iFirst % iSecond == 0))
break;

}

//若到了循环上限，那么就重新赋予一个表达式
if (count == 10000)
{
char c[3] = {'+','-','*'};
SetExpression(c[rand()%3]);
return;
}

}

//构造表达式，并加入容器
Expression info;
info.iFirst = iFirst;
info.iSecond = iSecond;
info.oper = oper;
info.result = iFirst / iSecond;

if (oper == '+')
info.result = iFirst + iSecond;
else if (oper == '-')
info.result = iFirst - iSecond;
else if (oper == '*')
info.result = iFirst * iSecond;
else if (oper == '/')
info.result = iFirst / iSecond;

vector_Expression.push_back(info);
}

这只是一个控制台程序，很单一，如果觉得可以就拿去用吧！复制粘贴就可以运行了。