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C++ 编程 计算机

1、 整数、实数的加、减、乘、除

2、分数的计算。将分数定义为两个整数之比,如:1/2,3/4,24/48,64/2等;分数也可以是负数,如-1/2,15/-24;分数运算结果要是最简化的,如:4/-8,应表示成等价的-1/2。

3、复数的计算

答案:#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;

class Complex//复数
{
public:
 Complex(double ,double );//有参数构造
 Complex():real(0),image(0){}//无参数构造
 ~Complex(){}//析构

 void print();//显示

 Complex operator + (Complex );//重载 + 号
 Complex operator - (Complex );//重载 - 号
 Complex operator * (Complex );//重载 * 号
 Complex operator / (Complex );//重载 / 号

private:
 double real;
 double image;
};

struct Fraction//分数
{
 int denominator;//分母
 int molecular;//分子
};

double add_integer(double a,double b,char c)//实数计算
{
 switch(c)
 {
 case '+':return a+b;break;
 case '-':return a-b;break;
 case '*':return a*b;break;
 case '/':return a/b;break;
 default:return 0;break;
 }
}

int change(int a,int b)//求最大公约数,用以简化分数
{
 int n;
 int r=1;
 if(a>b) n=b;
 else n=a;
 for(int i=1;i<=n;i++)
 {
  if((a%i==0)&&(b%i==0)) r=i;
 }
 return r;
}

Fraction get_fraction(string str)//从一个字符串中提取分子和分母
{
 Fraction F;
 string str_temp="";
 int n=str.find('/');//找到 / 号的位置
 int i=0;
 for(;i<n;i++)
 {
  str_temp+=str[i];
 }
 F.molecular=atoi(str_temp.c_str());//获取分子
 str_temp="";
 for(i=n+1;i<str.length();i++)
 {
  str_temp+=str[i];
 }
 F.denominator=atoi(str_temp.c_str());//获取分母
 return F;
}

Fraction add_fraction(Fraction a,Fraction b,char c)//分数运算
{
 Fraction F;
 switch(c)
 {
 case '+':
  {
   F.molecular=a.molecular+b.molecular;
   break;
  }
 case '-':
  {
   F.molecular=a.molecular-b.molecular;
   break;
  }
 case '*':
  {
   F.denominator=a.denominator*b.denominator;
   F.molecular=a.molecular*b.molecular;
   break;
  }
 case '/':
  {
   F.denominator=a.denominator*b.molecular;
   F.molecular=a.molecular*b.denominator;
   break;
  }
 }

 F.denominator=F.denominator/change(F.denominator,F.molecular);//简化分母
 F.molecular=F.molecular/change(F.denominator,F.molecular);//简化分子

 return F;
}

Complex::Complex(double real,double image)//构造
{
 this->real=real;
 this->image=image;
}

void Complex::print()//显示
{
 if(image==0) cout<<real;
 else cout<<"("<<real<<","<<image<<"i)";
}

Complex Complex::operator + (Complex a)//重载 + 号
{
 Complex c;
 c.real=a.real+this->real;
 c.image=a.image+this->image;
 return c;
}

Complex Complex::operator - (Complex a)//重载 - 号
{
 Complex c;
 c.real=this->real-a.real;
 c.image=this->image-a.image;
 return c;
}

Complex Complex::operator * (Complex i)//重载 * 号
{
 Complex r;
 double a,b,c,d;

 a=this->real;
 b=this->image;
 c=i.real;
 d=i.image;

 r.real=a*c-b*d;
 r.image=b*c+a*d;

 return r;
}

Complex Complex::operator / (Complex i)//重载 / 号
{
 Complex r;
 double a,b,c,d;

 a=this->real;
 b=this->image;
 c=i.real;
 d=i.image;

 r.real=(a*c+b*d)/(c*c+d*d);
 r.image=(b*c-a*d)/(c*c+d*d);

 return r;
}

Complex add_complex(Complex c1,Complex c2,char c)
{
 switch(c)
 {
 case '+':return c1+c2;break;
 case '-':return c1-c2;break;
 case '*':return c1*c2;break;
 case '/':return c1/c2;break;
 default:return c1;break;
 }
}

int main()
{
 string str_choose;
 while(true)
 {
  cout<<endl;
  cout<<endl;
  cout<<"******************"<<endl;
  cout<<"计算实数,请输入1"<<endl;
  cout<<"计算分数,请输入2"<<endl;
  cout<<"计算复数,请输入3"<<endl;
  cout<<"退出,请输入4"<<endl;
  cout<<"******************"<<endl;
  cout<<endl;
  cout<<endl;

  cin>>str_choose;

  if(str_choose=="1")
  {
   double a,b;
   char c;

   cout<<"请输入第一个数:";
   cin>>a;
   cout<<"请输入第二个数:";
   cin>>b;
   cout<<"请输入要执行的运算(+、-、*、/):";
   cin>>c;

   cin.clear();
   cin.sync();

   cout<<a<<c<<b<<"="<<add_integer(a,b,c)<<endl;
  }
  else if(str_choose=="2")
  {
   Fraction F1,F2,F;
   string str_fraction1,str_fraction2;
   char c;

   cout<<"请输入第一个分数:";
   cin>>str_fraction1;
   cout<<"请输入第二个分数:";
   cin>>str_fraction2;
   cout<<"请输入要执行的运算(+、-、*、/):";
   cin>>c;

   cin.clear();
   cin.sync();

   F1=get_fraction(str_fraction1);
   F2=get_fraction(str_fraction2);

   F=add_fraction(F1,F2,c);

   cout<<str_fraction1<<" "<<c<<" "<<str_fraction2<<" = "<<F.molecular<<"/"<<F.denominator<<endl;
  }
  else if(str_choose=="3")
  {
   double a,b,c,d;
   char ch;

   cout<<"请输入第一个复数的实部:"<<endl;
   cin>>a;
   cout<<"请输入第一个复数的虚部:"<<endl;
   cin>>b;
   cout<<"请输入第二个复数的实部:"<<endl;
   cin>>c;
   cout<<"请输入第二个复数的虚部:"<<endl;
   cin>>d;
   cout<<"请输入要执行的运算(+、-、*、/):";
   cin>>ch;

   cin.clear();
   cin.sync();

   Complex c1(a,b);
   Complex c2(c,d);

   Complex c3;
   
   c3=add_complex(c1,c2,ch);

   c1.print();
   cout<<" "<<ch<<" ";
   c2.print();
   cout<<" = ";
   c3.print();
   cout<<endl;
  }
  else if(str_choose=="4")
  {
   cout<<"谢谢使用,再见!!"<<endl;
   break;
  }
  else cout<<"您的输入有误!!"<<endl;
 }
 return 0;
}

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