第9周项目5-方程类

来源：互联网发布：网络诈骗主题班会ppt 编辑：程序博客网时间：2024/06/04 14:34
#include <iostream>#include<stdlib.h>using namespace std;class CEquation{private:    double a;     // 未知数系数    double b;     // 常数项    char unknown; // 代表未知数的符号public:    CEquation(double aa=0,double bb=0);    friend istream &operator >> (istream &in,CEquation &e);    friend ostream &operator << (ostream &out,CEquation &e);    double Solve();    char getUnknown();};char CEquation::getUnknown(){    return unknown;}double CEquation::Solve(){    double n;    n=-b/a;    return n;}ostream &operator << (ostream &out,CEquation &e){    if(e.b>=0)        cout<<e.a<<e.unknown<<"+"<<e.b<<"=0";    else    {        double q;        q=-e.b;        cout<<e.a<<e.unknown<<"-"<<q<<"=0";    }    return out;}istream &operator >> (istream &in,CEquation &e){    char m;    int l;    cin>>e.a>>e.unknown>>e.b>>m>>l;    return in;}CEquation::CEquation(double aa,double bb){    a=aa;    b=bb;}int main(){    CEquation e;    cout<<"请输入方程(格式：ax-b=0，a、b为常数，x处是代表未知数的字母)：";    cin>>e;   //在两次测试中，分别输入3x-8=0和50s+180=0    cout<<"方程为："<<e;    cout<<"方程的解为："<<e.getUnknown()<<"="<<e.Solve()<<endl; //对两次测试，分别输出x=...和s=...    e.Solve();}
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