复数 题解:
#include<bits/stdc++.h>
using namespace std;
int main(){
// a+bi c+di
double a,b,c,d;
char x;
cin >> a >> b >> c >> d >> x;
if(x == '+') printf("%.1f %.1f\n",a + c, b + d);
if(x == '*') printf("%.1f %.1f\n",a * c - b * d, a * d + b * c);
return 0;
}
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