复数类（包括运算符重载）

#include"fushu.h" fushu::fushu() { real= 0 ; imag= 0 ; } fushu::fushu( double _real, double _imag) { real=_real; imag=_imag; } fushu operator+(const fushu & p,const fushu & q) { fushu m=fushu(p.real+q.real,p.imag+q.real); return m; } fushu operator-(const fushu & p,const fushu & q) { fushu m=fushu(p.real-q.real,p.imag-q.imag); return m; } fushu operator*(const fushu & p,const fushu & q) { fushu m=fushu(p.real*q.real-p.imag*q.imag,p.real*q.imag+q.real*p.imag); return m; } fushu operator/(const fushu & p,const fushu & q) { fushu m=fushu((p.real*q.real+p.imag*q.imag)/(p.real*p.real+q.imag*q.imag),(p.real*q.imag-q.real*p.imag)/(p.real*p.real+q.imag*q.imag)); return m; } ostream & operator<<(ostream & o, const fushu & p) { if ( p.imag==0 ) o<<p.real<<endl ; else if(p.real==0) o<<p.imag<<"i\n"; else o<<p.real<<"+("<<p.imag<<"i)\n" ; return o ; } void operator>>(istream & i, fushu &p) { cout<<"Enter a plural: "<<endl; cout<<"Real:" ; i>>p.real ; cout<<"Imag:" ; i>>p.imag ; cout<<"The plural is " <<p.real <<"+" <<p.imag <<"i\n" ; }