Nineth Week item Five-My equation class

Design a one-dimensional equation class to find the solution of the equation such as ax+b=0.
For example: When input 3x-8=0, the solution of the output equation is x=2.66667;
Again such as: when input 5s+18=0, the solution of the output equation is s=-3.6;
The reference interface is as follows:

The reference code is:

Class cequation{private:double A;     Unknown coefficient double b;     Constant term char unknown; Symbol public:cequation representing unknown (double aa=0,double bb=0); friend IStream &operator >> (IStream &in,cequation & amp;e); friend Ostream &operator << (ostream &out,cequation &e);d ouble Solve (); Char Getunknown ();}; int main () {cequation e;cout<< "Please enter the equation (format: ax-b=0,a, B is constant, X is the letter representing the unknown):";cin>>e;   In two Tests, the equations for the input 3x-8=0 and 50s+180=0cout<< are: "The solution of the <<e;cout<<" equation is: "<<e.getunknown () <<" = " <<e.solve () <<endl; Two Tests, respectively output x= ... and S=...e.solve ();}

Code

/* Copyright (c) 2015, Yantai University School of Computer * All rights reserved. * File name: Test.cpp * Author: Lenkidong * Completion Date: May 8, 2015 * version number: v1.0*/#include "iostream" using namespace Std;class Cequation{pri     Vate:double A;     Unknown coefficient double b; Constant term char unknown;    Symbol public:cequation representing unknown (double aa=0,double bb=0);    Friend IStream &operator >> (IStream &in,cequation &e);    Friend Ostream &operator << (ostream &out,cequation &e);    Double Solve (); Char Getunknown ();}; Cequation::cequation (Double aa,double BB): A (AA), B (BB) {}//input equation istream &operator >> (IStream &in,    Cequation &e) {char ch1,ch2,ch3,ch4;        while (1) {cin>>e.a>>ch1>>ch2>>e.b>>ch3>>ch4; if (ch1>= ' a ' && ch1<= ' z ') if ((ch2== ' + ' | | ch2== '-') && ch3== ' = ' && ch4== ' 0 ') Bre        Ak    cout<< "The input equation format does not conform to the specification, please re-enter \ n";    } if (ch2== '-') e.b=-e.b;    E.unknown=ch1; return in;} // Output Equation ostream &operator << (ostream &out,cequation &e) {cout<<e.a<<e.unknown;    if (e.b>=0) cout<< "+";    cout<<e.b<< "=0" <<endl; return out;}    Solve double cequation::solve () {double x; if (a==0) {if (b==0) cout<< "Any real number is the solution of the equation.        "<<endl; else cout<< "equation has no solution.        "<<endl;    return 0;    } x=-b/a; return x;} Char Cequation::getunknown () {return unknown;}    int main () {cequation E;    cout<< "Please enter the equation (format: ax-b=0,a, B is constant, X is the letter representing the unknown):";   cin>>e;    In two Tests, input 3x-8=0 and 50s+180=0 cout<< "equation as:" <<e; The solution of the cout<< "equation is:" <<e.getunknown () << "=" <<e.solve () <<endl; Two Tests, respectively output x= ... and s= ... e.solve ();}

Operation Result:

Learning experience:

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Nineth Week item Five-My equation class