求救--VC++基本程序代码

虽然不懂C但是比我们版块太差了,既然要收费,俺晕
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打下酱油......
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我用的一直是C++啊^
你们写的是C啊
I服了U……
还有更正下：我自己些的代码从这没拿走任何代码……
我只是来看看有什么地方可以借鉴的，可是貌似  还没有什么我现在可以借鉴的
#include <iostream.h>
#include <time.h>
#include <stdlib.h>
double addition();
double subtract();
double multiplication();
double division();
int main()
{
    int n;
    cout<<"******************************"<<endl;
    cout<<"    小学生四则运算练习系统    "<<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<<"请选择（0--4）：";
    cin>>n;
    if(n==1)
    {
        cout<<"加法练习";
        addition();
    }
    else if(n==2)
    {
        cout<<"减法练习";
        subtract();
    }
    else if(n==3)
    {
        cout<<"乘法练习";
        multiplication();
    }
    else if(n==4)
    {
        cout<<"除法练习";
        division();
    }
    else if(n==0)
    {
        cout<<"退出";
        return 0;
    }
    else
    {
        cout<<"输入错误，请重新选择"<<endl;
        return main();
    }

}
double addition()
{
    int a,b,s,k;
    char m;
    srand(time(NULL));
    a=rand()%100;
    b=rand()%100;
    cout<<a<<"+"<<b<<"="<<endl;
    s=a+b;
    cout<<"请输入结果：";
    cin>>k;
    if(k==s)
        cout<<"正确，你真聪明！";
    else
    {
        cout<<"不正确，再想一想，你还有两次机会。"<<endl;
        cin>>k;
        if(k==s)
            cout<<"正确，继续保持！";
        else
        {
            cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            cin>>k;
            if(k==s)
                cout<<"正确，加油！";
            else
            {
                cout<<"不正确，要加强练习喔！正确答案为:"<<s<<endl;
            }
        }
    }
    cout<<"是否继续练习？（Y/N）";
    cin>>m;
    if(m=='n'||m=='N')
        return main();
    else
        return addition();
}
double subtract()
{
    int a,b,s,k;
    char m;
    srand(time(NULL));
    a=rand()%100;
    b=rand()%100;
    cout<<a<<"-"<<b<<"="<<endl;
    s=a-b;
    cout<<"请输入结果：";
    cin>>k;
    if(k==s)
        cout<<"正确，你真聪明！";
    else
    {
        cout<<"不正确，再想一想，你还有两次机会。"<<endl;
        cin>>k;
        if(k==s)
            cout<<"正确，继续保持！";
        else
        {
            cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            cin>>k;
            if(k==s)
                cout<<"正确，加油！";
            else
            {
                cout<<"不正确，要加强练习喔！正确答案为:"<<s<<endl;
            }
        }
    }
    cout<<"是否继续练习？（Y/N）";
    cin>>m;
    if(m=='n'||m=='N')
        return main();
    else
        return subtract();
}
double multiplication()
{
    int a,b,s,k;
    char m;
    srand(time(NULL));
    a=rand()%100;
    b=rand()%100;
    cout<<a<<"*"<<b<<"="<<endl;
    s=a*b;
    cout<<"请输入结果：";
    cin>>k;
    if(k==s)
        cout<<"正确，你真聪明！";
    else
    {
        cout<<"不正确，再想一想，你还有两次机会。"<<endl;
        cin>>k;
        if(k==s)
            cout<<"正确，继续保持！";
        else
        {
            cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            cin>>k;
            if(k==s)
                cout<<"正确，加油！";
            else
            {
                cout<<"不正确，要加强练习喔！正确答案为:"<<s<<endl;
            }
        }
    }
    cout<<"是否继续练习？（Y/N）";
    cin>>m;
    if(m=='n'||m=='N')
        return main();
    else
        return multiplication();
}
double division()
{
    double a,b,s,k;
    char m;
    srand(time(NULL));
    a=rand()%100;
    b=rand()%100;
    cout<<a<<"/"<<b<<"="<<endl;
    s=a/b;
    cout<<"请输入结果：";
    cin>>k;
    if(k==s)
        cout<<"正确，你真聪明！";
    else
    {
        cout<<"不正确，再想一想，你还有两次机会。"<<endl;
        cin>>k;
        if(k==s)
            cout<<"正确，继续保持！";
        else
        {
            cout<<"不正确，不要着急，要把握住最后一次机会喔！"<<endl;
            cin>>k;
            if(k==s)
                cout<<"正确，加油！";
            else
            {
                cout<<"不正确，要加强练习喔！正确答案为:"<<int((s+0.005)*100)/100.00<<endl;
            }
        }
    }
    cout<<"是否继续练习？（Y/N）";
    cin>>m;
    if(m=='n'||m=='N')
        return main();
    else
        return division();
}

你们自己看看吧   什么不是拿你们的代码
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时间有限，什么地方可以改进的，麻烦指出下，谢谢……
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我怎么没看到有C++的影子.

现在啥年代了,还用#include<iostream.h>

还有你的main( )函数设计的非常糟糕.
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