complex

/*
 Author: 曹北健(37509)
 Result: AC Submission_id: 5279941
 Created at: Sun Mar 26 2023 10:10:23 GMT+0800 (China Standard Time)
 Problem: 6714  Time: 4 Memory: 2096
*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#pragma warning(disable:4996)
int equal_f64(double x, double y){
    return fabs(x - y) < 1e-8;
}
int isint(double x){
    return (fabs(round(x) - x)) < 1e-8;
}
int main(){
    double a1, b1, a2, b2, e1, e2;
    char input[256] = { 0 },op;
    while(fgets(input, 255, stdin)){
        sscanf(input, "(%lf%lfi)%c(%lf%lfi)", &a1, &b1, &op, &a2, &b2);
        switch(op){
        case '+':
            e1 = a1 + a2;
            e2 = b1 + b2;
            break;
        case '-':
            e1 = a1 - a2;
            e2 = b1 - b2;
            break;
        case '*':
            e1 = a1 * a2 - b1 * b2;
            e2 = a1 * b2 + a2 * b1;
            break;
        case '/':
            e1 = (a1 * a2 + b1 * b2) / (a2 * a2 + b2 * b2);
            e2 = (b1 * a2 - a1 * b2) / (a2 * a2 + b2 * b2);
        default:
            break;
        }
        if(equal_f64(e1, 0.) && equal_f64(e2, 0.)){
            puts("0");
        }
        else if(equal_f64(e1, 0.)){//imag
            if(equal_f64(e2, 1.)){
                puts("i");
            }
            else if(equal_f64(e2, -1.)){
                puts("-i");
            }
            else if(isint(e2)){
                printf("%.0fi\n", e2);
            }
            else{
                printf("%.2fi\n", e2);
            }
        }
        else if(equal_f64(e2,0.)){//nonzero real
            if(isint(e1)){
                printf("%.0f\n", e1);
            }
            else{
                printf("%.2f\n", e1);
            }
        }
        else{//complex
            if(isint(e1)){
                printf("%.0f", e1);
            }
            else{
                printf("%.2f", e1);
            }
            if(equal_f64(e2, 1.)){
                puts("+i");
            }
            else if(equal_f64(e2, -1.)){
                puts("-i");
            }
            else if(isint(e2)){
                printf("%+.0fi\n", e2);
            }
            else{
                printf("%+.2fi\n", e2);
            }
        }
    }
    return 0;
}