我们学的就是C++啊
可是 我们用的却是VC6.0啊
我以为VC就和C++一样
…………
现在在忙碌ing
很烦恼ing
……
整个世界都在转了

刚刚得到的新消息：老师说了连递归语句也不能用……
晕了……
还让人活吗
继续重来吧

#include <iostream.h>
#include <time.h>  //取当前时间作为随机数的种子
#incluee <stdlib.h>
void main()
{
  int select;
  cout<<"*************************************\n";
  cout<<"      小学生四则运算练习系统         \n";
  cout<<"              1--加法练习            \n";
  cout<<"              2--减法练习            \n";
  cout<<"              3--乘法练习            \n";
  cout<<"              4--除法练习            \n";
  cout<<"              0--退出                \n";
  cout<<"请选择（0--4）:";
  while(true)
  {
    cin>>select;
    switch(select)
    {
      case 1:
        addition();
        continue;
      case 2:
        subtract();
        continue;
      case 3:
        multiplication();
        continue;
      case 4:
        division();
        continue;
      case 0:
        break;
    }
  }
}

void  addition()
{
  int a,b,result,input,trycount; //被加数,加数,正确结果,输入的结果,测试次数
  trycount = 0;
  srand((unsigned int)time(NULL)); //初始化随机数种子
  a = rand() % 100 + 1; //被加数,1到100之间的一个整数
  b = rand() % 100 + 1; //加数,1到100之间的一个整数
  result = a + b;
  cout<<"请你输入"<<a<<"+"<<b<<"=?的结果\n";
  cin>>input;
  while(trycount <= 3)               //只能猜三次,控制循环
  {
    if(input == result)              //当答对时的判断
    {
      switch(trycount)
      {
        case 0:
          cout<<"正确，你真聪明!";
          break;
        case 1:
          cout<<"正确，继续保持!";
          break;
        case 2:
          cout<<"正确，加油!";
          break;
      }
    }
    else                             //当答错时的判断
    {
      trycount++;
      switch(trycount)
      {
        case 1:
          cout<<"不正确，再想一想，你还有两次机会。";
          cin>>input;
          continue;
        case 2:
          cout<<"不正确，不要着急，要把握住最后一次机会喔！";
          cin>>input;
          continue;
        case 3:
          cout<<"不正确，要加强练习喔！正确答案为"<<result;
          break;
      }
    }
  }

  char g;
  cout<<"是否继续练习(Y/N)";
  cin>>g;
  if('Y' == g || 'y' == g) addition(); //递归调用自己继续做题
  else return; //否则返回
}

我建议你把老师抽一顿，不识货的家伙该打

我小学的时候写过这玩意，当时是用的GWBasic（小霸王学习机上的玩意儿），那个上面压根儿就没有这么多控制语句，连switch和子程序都没有，子程序就是GOSUB和RETURN，连递归都不允许，面对这种东西只能满程序的goto，哈哈~~~~

再顺便说一下，现在再看这程序，可以写得很简单，用一个函数处理运算，一个函数处理算式生成，UI直接放主函数处理，菜单啥的用宏得了，主函数一个用getchar做循环条件的循环语句……加起来三十行应该能解决吧……

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

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

double main()
{
  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<<"            0--退出                  "<<endl;
  cout<<" 请选择 (0--4): "<<endl;
  char x;
  cin>>x;
  if (x=='1')
  {
      cout<<"您选择了加法练习: "<<endl;
      addition ( );
  }
  if (x=='2')
  {
      cout<<"您选择了减法练习:"<<endl;
      subtract ();
  }

  if (x=='3')
  {
      cout<<"您选择了乘法练习: "<<endl;
      multiplication ();
  }
  if (x=='4')
  {
      cout<<"您选择了除法练习:"<<endl;
      division ();
  }
  if (x=='0')
  {
      exit (1);
  }    
  else
  {
      cout<<"请选择 (0--4)"<<endl;
      return main();
  }
}


double addition ()
{
    double a,b,c,s;
    srand (time(NULL));
    a=rand ()%100;
    b=rand ()%100;
    cout<<a<<"+"<<b<<"="<<endl;
    s=a+b;
    cout<<"请输入计算结果:"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确，你真聪明!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return addition ();
    }
    else cout<<"不正确,再想一想,你还有两次机会!"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,继续保持!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return addition ();
    }
    else cout<<"不正确，不要着急，要把握住最后一次机会喔"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,加油!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return addition ();
    }
    else cout<<"不正确,要加强练习喔!正确的答案为:"<<s<<endl;
    cout<<"是否要继续练习? (Y/N)"<<endl;
    char z;
    cin>>z;
    if (z=='n'||z=='N')
    {
        return main ();
    }
    else
        return addition ();
}
double subtract ()
{
    double a,b,c,s;
    srand (time(NULL));
    a=rand ()%100;
    b=rand ()%100;
    cout<<a<<"-"<<b<<"="<<endl;
    s=a-b;
    cout<<"请输入计算结果:"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确，你真聪明!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return subtract ();
    }
    else cout<<"不正确,再想一想,你还有两次机会!"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,继续保持!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return subtract ();
    }
    else cout<<"不正确，不要着急，要把握住最后一次机会喔"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,加油!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return subtract ();
    }
    else cout<<"不正确,要加强练习喔!正确的答案为:"<<s<<endl;
    cout<<"是否要继续练习? (Y/N)"<<endl;
    char z;
    cin>>z;
    if (z=='n'||z=='N')
    {
        return main ();
    }
    else
        return subtract ();
}

double multiplication ()
{
    double a,b,c,s;
    srand (time(NULL));
    a=rand ()%100;
    b=rand ()%100;
    cout<<a<<"*"<<b<<"="<<endl;
    s=a*b;
    cout<<"请输入计算结果:"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确，你真聪明!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return multiplication ();
    }
    else cout<<"不正确,再想一想,你还有两次机会!"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,继续保持!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
 
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return multiplication ();
    }
    else cout<<"不正确，不要着急，要把握住最后一次机会喔"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,加油!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return multiplication ();
    }
    else cout<<"不正确,要加强练习喔!正确的答案为:"<<s<<endl;
    cout<<"是否要继续练习? (Y/N)"<<endl;
    char z;
    cin>>z;

    if (z=='n'||z=='N')
    {
        return main ();
    }
    else
        return multiplication ();
}


double division ()
{
    double a,b,c,s;
    cout<<"你选择了除法练习(结果四舍五入,保留两位小数)"<<endl;
    do
    {
        srand (time(NULL));
        a=rand ()%100;
        b=rand ()%100;
    }
    while (b==0);
    cout<<a<<"/"<<b<<"="<<endl;
    s=a/b;
 
    cout<<"请输入计算结果:"<<endl;
    s=int(s*100.0+0.5)/100.00;
    cin>>c;
    if (s==c)
    {
        cout<<"正确，你真聪明!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return division ();
    }
    else cout<<"不正确,再想一想,你还有两次机会!"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,继续保持!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return division ();
    }
    else cout<<"不正确，不要着急，要把握住最后一次机会喔"<<endl;
    cin>>c;
    if (s==c)
    {
        cout<<"正确,加油!"<<endl;
        cout<<"是否要继续练习? (Y/N)"<<endl;
        char z;
        cin>>z;
        if (z=='n'||z=='N')
        {
            return main ();
        }
        else
            return division ();
    }
    else cout<<"不正确,要加强练习喔!正确的答案为:"<<s<<endl;
    cout<<"是否要继续练习? (Y/N)"<<endl;
    char z;
    cin>>z;
    if (z=='n'||z=='N')
    {
        return main ();
    }
    else
        return division ();
}




长是长了点  但水平有限
有地方什么能改进的  有什么要提问的
有什么地方有错的  
请大家多多指导啊
谢谢大家的 支持
努力  努力……

代码冗余太大


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你看你的程序里面重复的地方
可以用函数/宏来“归纳”出来吗？
这样代码会短一些