所以呢，有偿服务是最好的解决方法……

看到你们的话，我知道，首先我不是个好学生，也许我拿到我想要的东西就不在回来了，昨天有个人加我，和我说了一大通的话，害的我拿到了你们发的代码，却不敢用，如果我用了，那就意味着我和你们所说 的一样了，现在我在机房，自己做着…… 现在还是在做加法，昨天就已经做出来了，现在还在做，是自己做的，但还是要谢谢给我帮助的人，其次，我想学好C++，我承认我已经学了将近一年了吧，我几乎什么也没学到，好吧  ，就说我什么也没学到，可我有什么办法，现在在学校没人管，自己就不是自己了，偶尔拿来书看看，很简单嘛，就丢一边了，现在在实训，才知道，自己狗屁都不知道。最后，我是昨天才发现这个个网站的 ，我想说，以前我不知道，现在我知道了这个地方，这有我需要的东西，有我要学习 的东西，我回经常来看，虽然我不是个好学生

咳咳，还不错……
LZ加油，我C++也就只学了一年而已就会了~~~
（虽然真正理解C++是在两年以后……）

有点好奇，是谁有那么闲的功夫说服你的？

她的网名叫--紫影雪   貌似还是 个MM

所以，不要过早对一个人下结论。

我觉得LZ这孩子就不错。

学习要主动，不要应付
如果是为了作业，那还是先拜拜

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

double addition ();
double subtract ();
double multiplication ();
double division ();

int main ()
{
    char shuzi;
    xuanze:
    {
        cout<<"***************************************************"<<endl;
        cout<<endl;
        cout<<"                 小学四则运算练习系统              "<<endl;
        cout<<endl;
        cout<<"***************************************************"<<endl;
        cout<<endl;
        cout<<"                     1--加法练习                   "<<endl;
        cout<<"                     2--减法练习                   "<<endl;
        cout<<"                     3--乘法练习                   "<<endl;
        cout<<"                     4--除法练习                   "<<endl;
        cout<<endl;
        cout<<"                     0--退出                       "<<endl;
        cout<<"请选择（0--4）：                                   "<<endl;
        cin>>shuzi;
        switch (shuzi)
        {
            case '1':
                cout<<"你选择了加法练习"<<endl;
                addition ();
                if('n'||'N')
                    goto xuanze;
                break;
            case '2':
                cout<<"你选择了减法练习"<<endl;
                subtract ();
                if('n'||'N')
                    goto xuanze;
                break;
            case '3':
                cout<<"你选择了乘法练习 "<<endl;
                multiplication ();
                if('n'||'N')
                    goto xuanze;
                break;
            case '4':
                cout<<"你选择了除法练习 "<<endl;
                division ();
                if('n'||'N')
                    goto xuanze;
                break;
            case '0':
                cout<<"按任意键退出"<<endl;
                break;
            default:
            {
                goto xuanze;
            }
        }

    }
    return 0;
}

double addition ()
{
    int n,a,b,s;
    wenti:
    {
        time(NULL);
        srand(time(NULL));
        a=rand()%100;
        b=rand()%100;
        s=a+b;
        cout<<a<<"+"<<b<<"=?"<<endl;
        cin>>n;
        if(n==s)
        {
            cout<<"正确，你真聪明！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"结果不对,你再想想,你还有两次机会!"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，继续保持！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，加油！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，要加强练习喔！"<<" "<<"正确答案为："<<s<< endl;
                cout<<endl;
                goto xunwen;
            }
        }
        xunwen:
        {
            char ch;
            cout<<"是否繼續？是Y/否N"<<endl;
            cin>>ch;
            if (ch=='n' || ch=='N')
            {
                return s;
            }
            else
            {
                if (ch=='y' || ch=='Y')
                {
                    goto wenti;
                }
                else
                {
                    goto xunwen;
                }
            }
        }
    }
}

double subtract ()
{
    int n,a,b,s;
    wenti:
    {
        time(NULL);
        srand(time(NULL));
        a=rand()%100;
        b=rand()%100;
        s=a-b;
        cout<<a<<"-"<<b<<"=?"<<endl;
        cin>>n;
        if(n==s)
        {
            cout<<"正确，你真聪明！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"结果不对,你再想想,你还有两次机会!"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，继续保持！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，加油！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，要加强练习喔！"<<" "<<"正确答案为："<<s<< endl;
                cout<<endl;
                goto xunwen;
            }
        }
        xunwen:
        {
            char ch;
            cout<<"是否繼續？是Y/否N"<<endl;
            cin>>ch;
            if (ch=='n' || ch=='N')
            {
                return s;
            }
            else
            {
                if (ch=='y' || ch=='Y')
                {
                    goto wenti;
                }
                else
                {
                    goto xunwen;
                }
            }
        }
    }
}

double multiplication ()
{
    int n,a,b,s;
    wenti:
    {
        time(NULL);
        srand(time(NULL));
        a=rand()%100;
        b=rand()%100;
        s=a*b;
        cout<<a<<"*"<<b<<"=?"<<endl;
        cin>>n;
        if(n==s)
        {
            cout<<"正确，你真聪明！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"结果不对,你再想想,你还有两次机会!"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，继续保持！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，加油！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，要加强练习喔！"<<" "<<"正确答案为："<<s<< endl;
                cout<<endl;
                goto xunwen;
            }
        }
        xunwen:
        {
            char ch;
            cout<<"是否繼續？是Y/否N"<<endl;
            cin>>ch;
            if (ch=='n' || ch=='N')
            {
                return s;
            }
            else
            {
                if (ch=='y' || ch=='Y')
                {
                    goto wenti;
                }
                else
                {
                    goto xunwen;
                }
            }
        }
    }
}

double division ()
{
    double n,a,b,s;
    wenti:
    {
        time(NULL);
        srand(time(NULL));
        a=rand()%100;
        b=rand()%100;
        s=a/b;
        cout<<a<<"/"<<b<<"=?"<<endl;
        cin>>n;
        if(n==s)
        {
            cout<<"正确，你真聪明！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"结果不对,你再想想,你还有两次机会!"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，继续保持！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            }
        }
        cin>>n;
        if(n==s)
        {
            cout<<"正确，加油！"<<endl;
            goto xunwen;
        }
        else
        {
            if(n!=s)
            {
                cout<<"不正确，要加强练习喔！"<<" "<<"正确答案为："<<s<< endl;
                cout<<endl;
                goto xunwen;
            }
        }
        xunwen:
        {
            char ch;
            cout<<"是否繼續？是Y/否N"<<endl;
            cin>>ch;
            if (ch=='n' || ch=='N')
            {
                return s;
            }
            else
            {
                if (ch=='y' || ch=='Y')
                {
                    goto wenti;
                }
                else
                {
                    goto xunwen;
                }
            }
        }
    }
}
   就是这样了
可是
可是
……
老师竟然说不能用……
！·#￥%……
没天理啊  说是可读性太差，我没容易吗，
又要从来，忙了一个下午想来想去还是 goto语句好用啊 ……
哎……  
烦恼了

LZ似乎连C++和VC++还没分清....