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Posted on 2011-10-05 22:03 hoshelly 阅读(1279) 评论(1) 编辑 收藏 引用 所属分类: C++
小累，国庆假期过去一大半，C++这时候才把递归和函数这一块知识点慢慢地啃完了，结束之前，今晚自己写了一个小程序，实现四则运算，适合小学生使用。 程序说明： 1）允许用户选择一种类型的算术问题来学习，输入1表示加法，2表示减法，3表示乘法，4表示除法，5表示四种混合运算； 2）由于程序代码中反复无穷递归，所以该程序的运算会不断进行下去，退出请自动关闭程序； 源代码如下：
 #include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int Mul(int,int);
int Plus(int,int);
int Sub(int,int);
float Div(float,float);
int main()
   {
 int a=0,b=0;
int i;
srand(time(0));
cout<<"What do you want to study?(1-Plus,2-Sub,3-Mul，4-division，5-all the above)"<<endl;
cin>>i
switch(i)
  {
case 1:Plus(a,b);break;
case 2:Sub(a,b);break;
case 3:Mul(a,b);break;
case 4:Div(a,b);break;
case 5:switch(1+rand()%4)
{
case 1:Plus(a,b);break;
case 2:Sub(a,b);break;
case 3:Mul(a,b);break;
case 4:Div(a,b);break;
default:break;
 }break;
default:break;
}
return 0;
 }
float Div(float x,float y)
{
float m1, m;
int k;
k=1+rand()%4;
int a1;
cout<<"Please choose the level of this game(1 or 2):"<<endl;
cin>>a1;
srand(time(0));
if(a1==1)
{
x=1+rand()%9;
y=1+rand()%9;
}
if(a1==2)
{
x=1+rand()%99;
y=1+rand()%99;
}
m=x/y;
cout<<x<<"/"<<y<<"=?"<<endl;
cin>>m1;
if(m1==m)
{
switch(k)
{
case 1:cout<<"Very good!"<<endl;break;
case 2:cout<<"Excellent!"<<endl;break;
case 3:cout<<"Nice work!"<<endl;break;
case 4:cout<<"Keep up the good work!"<<endl;break;
default:break;
}
Div(x,y);
}
else
{
switch(k)
{
case 1:cout<<"Sorry,your answer is wrong!"<<endl;break;
case 2:cout<<"Wrong.Try once again!"<<endl;break;
case 3:cout<<"Don't give up!"<<endl;break;
case 4:cout<<"No.Keep trying."<<endl;break;
default:break;
}
Div(x,y);
}
return 0;
}
int Sub(int x,int y)
{
int m1, m,k;
k=1+rand()%4;
int a1;
cout<<"Please choose the level of this game(1 or 2):"<<endl;
cin>>a1;
srand(time(0));
if(a1==1)
{
x=1+rand()%9;
y=1+rand()%9;
}
if(a1==2)
{
x=1+rand()%99;
y=1+rand()%99;
}
m=x-y;
cout<<x<<"-"<<y<<"=?"<<endl;
cin>>m1;
if(m1==m)
{
switch(k)
{
case 1:cout<<"Very good!"<<endl;break;
case 2:cout<<"Excellent!"<<endl;break;
case 3:cout<<"Nice work!"<<endl;break;
case 4:cout<<"Keep up the good work!"<<endl;break;
default:break;
}
Sub(x,y);
}
else
{
switch(k)
{
case 1:cout<<"Sorry,your answer is wrong!"<<endl;break;
case 2:cout<<"Wrong.Try once again!"<<endl;break;
case 3:cout<<"Don't give up!"<<endl;break;
case 4:cout<<"No.Keep trying."<<endl;break;
default:break;
}
Sub(x,y);
}
return 0;
}
int Plus(int x,int y)
{
int m1, m,k;
k=1+rand()%4;
int a1;
cout<<"Please choose the level of this game(1 or 2):"<<endl;
cin>>a1;
srand(time(0));
if(a1==1)
{
x=1+rand()%9;
y=1+rand()%9;
}
if(a1==2)
{
x=1+rand()%99;
y=1+rand()%99;
}
m=x+y;
cout<<x<<"+"<<y<<"=?"<<endl;
cin>>m1;
if(m1==m)
{
switch(k)
{
case 1:cout<<"Very good!"<<endl;break;
case 2:cout<<"Excellent!"<<endl;break;
case 3:cout<<"Nice work!"<<endl;break;
case 4:cout<<"Keep up the good work!"<<endl;break;
default:break;
}
Plus(x,y);
}
else
{
switch(k)
{
case 1:cout<<"Sorry,your answer is wrong!"<<endl;break;
case 2:cout<<"Wrong.Try once again!"<<endl;break;
case 3:cout<<"Don't give up!"<<endl;break;
case 4:cout<<"No.Keep trying."<<endl;break;
default:break;
}
Plus(x,y);
}
return 0;
}
int Mul(int x,int y)
{
int m1, m,k;
k=1+rand()%4;
int a1;
cout<<"Please choose the level of this game(1 or 2):"<<endl;
cin>>a1;
srand(time(0));
if(a1==1)
{
x=1+rand()%9;
y=1+rand()%9;
}
if(a1==2)
{
x=1+rand()%99;
y=1+rand()%99;
}
m=x*y;
cout<<x<<"*"<<y<<"=?"<<endl;
cin>>m1;
if(m1==m)
{
switch(k)
{
case 1:cout<<"Very good!"<<endl;break;
case 2:cout<<"Excellent!"<<endl;break;
case 3:cout<<"Nice work!"<<endl;break;
case 4:cout<<"Keep up the good work!"<<endl;break;
default:break;
}
Mul(x,y);
}
else
{
switch(k)
{
case 1:cout<<"Sorry,your answer is wrong!"<<endl;break;
case 2:cout<<"Wrong.Try once again!"<<endl;break;
case 3:cout<<"Don't give up!"<<endl;break;
case 4:cout<<"No.Keep trying."<<endl;break;
default:break;
}
Mul(x,y);
}
return 0;
}
小程序的压缩版下载地址： http://ishare.iask.sina.com.cn/f/19626833.html
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# re: 实现四则运算的小程序源代码 回复 更多评论
2011-12-15 18:46 by
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