【例4.8】定义复数Complex类,使用友元函数.doc

【例4.8】定义复数Complex类，使用友元函数，完成复数的加法、减法、乘法运算，以及对复数的输出。#includeclass Complexdouble real;double image;public:Complex(double r=0,double i=0)real=r; image=i;friend void inputcomplex(Complex &comp);friend Complex addcomplex(Complex c1,Complex c2); friend Complex subcomplex(Complex c1,Complex c2);friend Complex mulcomplex(Complex c1,Complex c2);friend void outputcomplex(Complex comp);void inputcomplex(Complex &comp)cincomp.realcomp.image;Complex addcomplex(Complex c1,Complex c2)Complex c;c.real=c1.real+c2.real;c.image=c1.image+c2.image;return c;Complex subcomplex(Complex c1,Complex c2)Complex c;c.real=c1.real-c2.real;c.image=c1.image-c2.image;return c;Complex mulcomplex(Complex c1,Complex c2)Complex c;c.real=c1.real*c2.real-c1.image*c2.image;c.image=c1.real*c2.image+c1.image*c2.real;return c;void outputcomplex(Complex comp)cout(comp.real,comp.image);void main()Complex c1,c2,result;cout请输入第一个复数的实部和虚部:endl;inputcomplex(c1);cout请输入第二个复数的实部和虚部:endl;inputcomplex(c2);result=addcomplex(c1,c2);outputcomplex(c1);cout+;outputcomplex(c2);cout=;outputcomplex(result);coutn-endl;result=subcomplex(c1,c2);outputcomplex(c1);cout-;outputcomplex(c2);cout=;outputcomplex(result);coutn-endl;result=mulcomplex(c1,c2);outputcomplex(c1);cout*;outputcomplex(c2);cout=;outputcomplex(result);coutendl;程序的运行结果为：请输入第一个复数的实部和虚部:1 2请输入第二个复数的实部和虚部:3 4(1,2)+(3,4)=(4,6)-(1,2)-(3,4)=(-2,-2)-(1,2)*(3,4)=(-5,10)说明：此例中，我们通过友元函数实现了复数的加法、减法、乘法运算，以及复数的输入和