小学数学算数出题程序

程序调试运行过程：

 

①  开始的输入界面，可以选择计算的最大数值限制和题目个数。

②  题做对后，会有“√”号出现，表明评判完毕，题目做对。

③  题做错后，会有“×”号出现，表明评判完毕，题目做错。

④  除法运算，输入完商后，要求输入余数。

⑤  分数的运算。

⑥  做完规定的5道题后，会要求选择继续或退出。

 

我自认为自己做的这个小程序功能还是比较全面的，主要利用随机数的产生从而随机出题，函数较多，所以代码敲的可能有点多，有不足之处，还希望老师指正！

 

以下为程序源代码

#include "iostream"
#include "stdio.h"
#include "stdlib.h"
#include "math.h"
using namespace std;
int m,sum;
int com (int x,int y)                          //求最大公约数
{
    int p;
    if (y>x)
    {
        p=x;
        x=y;
        y=p;
    }
    while(x%y!=0)
    {
        p=x%y;
        x=y;
        y=p;
    }
    return y;
}
void add ()                                   //求加法
{
    int i,j,l;
    i=rand()%m;
    j=rand()%m;
    cout<<i<<" + "<<j<<" = ";
    cin>>l;
    if (l==i+j)
    {
        sum++;
        cout<<"               √"<<endl;
    }
    else
        cout<<"               ×"<<endl;
    return;
}
void sub ()                                  //求减法
{
    int i,j,l;
    i=rand()%m;
    j=rand()%(i+1);
    cout<<i<<" - "<<j<<" = ";
    cin>>l;
    if (l==i-j)
    {
        sum++;
        cout<<"               √"<<endl;
    }
    else
        cout<<"               ×"<<endl;
    return;
}
void mul ()                                  //求乘法
{
    int i,j,l;
    i=rand()%m;
    j=rand()%m;
    cout<<i<<" × "<<j<<" = ";
    cin>>l;
    if (l==i*j)
    {
        sum++; 
        cout<<"               √"<<endl;
    }
    else
        cout<<"               ×"<<endl;
    return;
}
void div ()                                 //求除法
{
    int i,j,l,o;
    i=rand()%m;
    j=rand()%i+1;
    cout<<i<<" ÷ "<<j<<" = ";
    cin>>l;
    cout<<"     余数 : ";
    cin>>o;
    if ((l==i/j)&&(o==i%j))
    {
        sum++;
        cout<<"               √"<<endl;
    }
    else
        cout<<"               ×"<<endl;
    return;
}
void fadd ()                                //求分数相加
{
    int i1,j1,i2,j2,i3,j3,l,o,a,b,c;
    char g;
    i1=rand()%m;
    j1=rand()%(m-1)+1;
    i2=rand()%m;
    j2=rand()%(m-1)+1;
    c=com(j1,i1);
    j1=j1/c;
    i1=i1/c;
    c=com(j2,i2);
    j2=j2/c;
    i2=i2/c;
    while (j1==1)
    {
        j1=rand()%(m-1)+1;
        c=com(j1,i1);
        j1=j1/c;
        i1=i1/c;
    }
    while (j2==1)
    {
        j2=rand()%(m-1)+1;
        c=com(j2,i2);
        j2=j2/c;
        i2=i2/c;
    }
    cout<<i1<<"/"<<j1<<" + "<<i2<<"/"<<j2<<" = ";
    cin>>l>>g>>o;
    j3=j1*j2;
    i3=i1*j2+i2*j1;
    a=i3;
    b=j3;
    c=com(a,b);
    if ((l==a/c)&&(o==b/c))
    {
        sum++;
        cout<<"               √"<<endl;
    }
    else
        cout<<"               ×"<<endl;
    return;
}
void fsub ()                                //求分数相减
{
    int i1,j1,i2,j2,i3,j3,l,o,a,b,c,p;
    char g;
    i1=rand()%m;
    j1=rand()%(m-1)+1;
    i2=rand()%m;
    j2=rand()%(m-1)+1;
    c=com(j1,i1);
    j1=j1/c;
    i1=i1/c;
    c=com(j2,i2);
    j2=j2/c;
    i2=i2/c;
    while (j1==1)
    {
        j1=rand()%(m-1)+1;
        c=com(j1,i1);
        j1=j1/c;
        i1=i1/c;
    }
    while (j2==1)
    {
        j2=rand()%(m-1)+1;
        c=com(j2,i2);
        j2=j2/c;
        i2=i2/c;
    }
    if (i1/j1<i2/j2)
    {
        p=j2;
        j2=j1;
        j1=p;
        p=i2;
        i2=i1;
        i1=p;
    }
    cout<<i1<<"/"<<j1<<" - "<<i2<<"/"<<j2<<" = ";
    cin>>l>>g>>o;
    j3=j1*j2;
    i3=i1*j2-i2*j1;
    a=i3;
    b=j3;
    c=com(a,b);
    if ((l==a/c)&&(o==b/c))
    {
        sum++;
        cout<<"               √"<<endl;
    }
    else
        cout<<"               ×"<<endl;
    return;
}
int main ()                                     //主函数
{
    int k,n,x;
    char c;
    cout<<"请输入题目允许的最大数(输入0退出) : ";
    cin>>m;
    if (m==0)
        return 0;
    m++;
    cout<<endl<<"请输入题目个数 : ";
    while (cin>>n!=0)
    {
        cout<<endl;
        x=n;
        sum=0;
        while (x--)
        {
            k=rand()%5;
            switch (k)                         //随机数随机选出类型
            {
                case 0:add();
                       break;
                case 1:sub();
                       break;
                case 2:mul();
                       break;
                case 3:div();
                       break;
                case 4:int t=rand()%2;
                    if (t=0)
                        fadd();
                    else if (t=1)
                        fsub();
                    break;
            }
        }
        cout<<endl<<"共做题目 "<<n<<" 道，其中做对 "<<sum<<" 道，做错 "<<n-sum<<" 道！"<<endl<<endl;
        cout<<"继续请按回车，退出请输入0 : ";
        c=getchar();
        c=getchar();
        if (c=='0')
            return 0;
        cout<<endl<<"请输入题目允许的最大数 : ";
        cin>>m;
         m++;
         cout<<endl<<"请输入题目个数 : ";
    }
    return 0;
}

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