#include<iostream>
using namespace std;
class Complex
{
    double real;
    double image;
public:
    Complex(double r = 0, double i = 0)
    {
        real = r; image = i;
    }
    friend void inputcomplex(Complex &comp1, Complex &comp2);
    friend Complex addcomplex(Complex c1, Complex c2);
    friend void outputcomplex(Complex comp);
};
void inputcomplex(Complex &comp1, Complex &comp2)
{
    char op, ab,p;
    cin >> comp1.real >> op >> comp1.image >>  p>> p >>comp2.real >> ab >> comp2.image >> p;
    if (op == '-',ab=='-') comp1.image = -comp1.image; comp2.image = -comp2.image;

 
}
Complex addcomplex(Complex c1, Complex c2)
{
    Complex c;
    c.real = c1.real + c2.real;
    c.image = c1.image + c2.image;
    return c;
}
void outputcomplex(Complex comp)
{
    cout << comp.real << ((comp.image >= 0) ? "+" : "") << comp.image << "i";
}
int main()
{
    Complex c1, c2, result;
    inputcomplex(c1, c2);
    result = addcomplex(c1, c2);
    outputcomplex(result);
    cout << endl;

}

提交上去之后是：



这个程序存在一个如果我虚部等于1，那么就会变成这样的问题：


我该如何修改？

这什么玩意儿，你得换本书了。你不会是跟谭浩强学的吧，他连C都一窍不通。

if (op == '-',ab=='-') comp1.image = -comp1.image; comp2.image = -comp2.image;
多看看吧

最重要的是，你连题目网站都不肯贴？！