算法训练 P1103

水，注意好输入输出就可以

#include <iostream>
#include <iomanip>

using namespace std;

void jia(double x,double y,double z,double w)
{
        cout<<fixed<<setprecision(2)<<x+z<<'+'<<y+w<<'i'<<endl;
}
void jian(double x,double y,double z,double w)
{
        cout<<fixed<<setprecision(2)<<x-z<<'+'<<y-w<<'i'<<endl;
}
void cheng(double x,double y,double z,double w)
{
        cout<<fixed<<setprecision(2)<<x*z-y*w<<'+'<<y*z+x*w<<'i'<<endl;
}
void chu(double x,double y,double z,double w)
{
        cout<<fixed<<setprecision(2)<<(x*z+y*w)/(z*z+w*w)<<'+'<<(y*z-x*w)/(z*z+w*w)<<'i'<<endl;
}

int main()
{
    char a;
    double x,y,z,w;

    while(cin>>a>>x>>y>>z>>w)
    {
            if(a=='+')
                jia(x,y,z,w);
            else if(a=='-')
                jian(x,y,z,w);
            else if(a=='*')
                cheng(x,y,z,w);
            else if(a=='/')
                chu(x,y,z,w);
    }

    return 0;
}