请问怎么把计算结果－0改为0？

void Complex::display() {

cout << "(" << real << "," << imag << "i)" << endl;

}

这里你判断一下real是否等于0，如果等于0，直接cout << "(0," << imag << "i)" << endl;

#include <iostream>

#include <iomanip>

using namespace std;
class Complex {
public:
	Complex(double x = 0, double y = 0) :real(x), imag(y) {}
	friend Complex operator * (Complex& c1, Complex& c2);
	friend Complex operator / (Complex& c1, Complex& c2);
	Complex operator + (Complex& c2);
	Complex operator - (Complex& c2);
	void display();
private:
	double real;
	double imag;
};
Complex operator * (Complex& c1, Complex& c2) {
	return Complex(c1.real * c2.real - c1.imag * c2.imag, c1.real * c2.imag + c1.imag * c2.real);
}
Complex operator / (Complex& c1, Complex& c2) {
	Complex c;
	c.real = (c1.real * c2.real + c1.imag * c2.imag) / (c2.real * c2.real + c2.imag * c2.imag);
	c.imag = (c1.imag * c2.real - c1.real * c2.imag) / (c2.real * c2.real + c2.imag * c2.imag);
	return c;
}
Complex  Complex ::operator + (Complex& c2) {
	return Complex(real + c2.real, imag + c2.imag);
}
Complex  Complex ::operator - (Complex& c2) {
	return Complex(real - c2.real, imag - c2.imag);
}

void Complex::display() {
	cout << "(" << real << "," << imag << "i)" << endl;
}

int main()

{
	


	double real, imag;
	cout << "first number:" << endl;
	cout << "real part:" << endl;
	cout << "image part:" << endl;
	cout << "second number:" << endl;
	cout << "real part:" << endl;
	cout << "image part:" << endl;

	cin >> real >> imag;

	Complex c1(real, imag);
	

	cin >> real >> imag;

	Complex c2(real, imag);

	Complex c3 = c1 + c2;
	Complex c4 = c1 - c2;
	Complex c5 = c1 * c2;
	Complex c6 = c1 / c2;

	

	cout << "c1+c2="; c3.display();
	cout << "c1-c2="; c4.display();
	cout << "c1*c2="; c5.display();
	cout <<setiosflags(ios::fixed) << setprecision(2) <<"c1/c2="; c6.display();

	return 0;

}