第八周实验报告4

在任务3的基础上拓展。分数类中的对象可以和整型数进行四则运算，且运算符合交换律。

例如：CFraction a(1,3),b; int i=2; 可以完成b=a+i;。同样，可以完成i+a, 45+a, a*27, 5/a等各种运算。

#include<iostream>#include<cmath>using namespace std;class CFraction{private:int nume;int deno;public:CFraction(int n=0, int d=1) : nume(n), deno(d){} CFraction operator + (CFraction &);    CFraction operator - (CFraction &);CFraction operator * (CFraction &);CFraction operator / (CFraction &);CFraction operator -();friend CFraction operator - (int &, CFraction &);friend CFraction operator + (int &, CFraction &);friend CFraction operator * (int &, CFraction &);friend CFraction operator / (int &, CFraction &);CFraction operator + (int &);    CFraction operator - (int &);CFraction operator * (int &);CFraction operator / (int &);void display();bool operator > (CFraction &);bool operator < (CFraction &);bool operator == (CFraction &);};CFraction CFraction::operator + (CFraction &a ){CFraction n;n.nume = a.deno * nume + a.nume * deno;n.deno = deno * a.deno ;return n;}CFraction CFraction::operator - (CFraction &a){CFraction n;n.nume = a.deno * nume - a.nume * deno;n.deno = deno * a.deno ;return n;}CFraction CFraction::operator / (CFraction &a){CFraction n;n.nume = nume * a.deno ;n.deno = deno * a.nume ;return n;}CFraction CFraction::operator * (CFraction &a){CFraction n;n.nume = nume * a.nume ;n.deno = deno * a.deno ;return n;}CFraction CFraction::operator -(){CFraction n;n.nume = -nume;n.deno = deno;return n;}CFraction operator - (int &i, CFraction &a){CFraction n;n.nume = (i * a.deno) - a.nume ;n.deno = a.deno ;return n;}CFraction operator + (int &i, CFraction &a){CFraction n;n.nume = (i * a.deno) + a.nume ;n.deno = a.deno ;return n;}CFraction operator * (int &i, CFraction &a){CFraction n;n.nume = i * a.nume ;n.deno = a.deno ;return n;}CFraction operator / (int &i, CFraction &a){CFraction n;n.nume = i * a.deno;n.deno = a.nume ;return n;}CFraction CFraction::operator + (int &i){CFraction n;n.nume = (i * deno) + nume ;n.deno = deno ;return n;}CFraction CFraction::operator - (int &i){CFraction n;n.nume = (i * deno) - nume ;n.deno = deno ;return n;}CFraction CFraction::operator * (int &i){CFraction n;n.nume = i * nume;n.deno = deno ;return n;}CFraction CFraction::operator / (int &i){CFraction n;n.nume = i * deno;n.deno = nume ;return n;}void CFraction::display(){int m, n, r, a, b;a = abs(nume);b = abs(deno);if( a > b){m = a;n = b;}else{m = b;n = a;}r = m % n;while( r != 0){m = n;n = r;r = m % n;}nume = nume / n;deno = deno / n;    if( deno == 1){cout << nume << endl;}else{ cout << nume << "/" << deno << endl;}}bool CFraction::operator > (CFraction &a){if( a.deno * nume > a.nume * deno){return true;}else{return false;}}bool CFraction::operator < (CFraction &a){if( a.deno * nume < a.nume * deno){return true;}else{return false;}}bool CFraction::operator == (CFraction &a){if( a.deno * nume < a.nume * deno){return true;}else{return false;}}int main(){CFraction c1(1,2), c2(1,3), c3;int i = 3;cout << "c1=";c1.display ();cout << "c2=";c2.display ();if( c1 > c2) cout << "c1>c2" << endl;if( c1 < c2) cout << "c1<c2" << endl;if( c1 == c2) cout << "c1=c2" << endl;    cout << "-c1 = ";c3 = -c1;c3.display ();cout << "c1+c2=";c3 = c1 + c2;c3.display ();cout << "c1-c2=";c3 = c1 - c2;c3.display ();cout << "c1*c2=";c3 = c1 * c2;c3.display ();cout << "c1/c2=";c3 = c1 / c2;c3.display ();cout << "3+c1=";c3 = i + c1;c3.display ();cout << "3-c1=";c3 = i - c1;c3.display ();    cout << "3*c1=";c3 = i * c1;c3.display ();    cout << "3/c1=";c3 = i / c1;c3.display ();cout << "c1+3=";c3 = c1 + i;c3.display ();cout << "c1-3=";c3 = c1 - i;c3.display ();    cout << "c1*3=";c3 = c1 * i;c3.display ();    cout << "c1/3=";c3 = c1 / i;c3.display ();system("pause");return 0;}