#include <stdio.h>

typedef struct {double re, im;} cplx;

cplx csum (cplx a, cplx b) // Complex sum
{
    cplx sum;
    sum.re = a.re + b.re;
    sum.im = a.im + b.im;
    return sum;
}

cplx cdif (cplx a, cplx b) // Complex difference
{
    cplx difference;
    difference.re = a.re - b.re;
    difference.im = a.im - b.im;
    return difference;
}

cplx cprod (cplx a, cplx b) // Complex product
{
    cplx product;
    product.re = (a.re * b.re) - (a.im * b.im);
    product.im = (a.im * b.re) + (a.re * b.im);
    return product;
}

cplx cquo (cplx a, cplx b) // Complex quotient
{
    cplx quotient;
    quotient.re = ((a.re * b.re)+(a.im * b.im)) / ((b.re*b.re)+(b.im*b.im));
    quotient.im = ((a.im * b.re)-(a.re * b.im)) / ((b.re*b.re)+(b.im*b.im));
    return quotient;
}

int main(int argc, void** args)
{
    double j, k;
    cplx a={1,2}, b={-3,-4}, c = {12.3, 12.4};
    char exitflag=0;
    int menu=0;
    while(!exitflag)
    {
        
        printf("A = %.1lf%+.1lfi B = %.1lf%+.1lfi\n\n", a.re, a.im, b.re, b.im);
        puts("(1) vnos");
        puts("(2) vsota");
        puts("(3) razlika");
        puts("(4) produkt");
        puts("(5) kvocient");
        puts("(6) izhod");
        printf("Vnesi ukaz: ");
        scanf(" %d", &menu);
        switch(menu)
        {
            case 1:   
                      printf("Vnesi prvo vrednost: ");
                      scanf("%lf%lfi", &a.re, &a.im);
                      printf("Vnesi drugo vrednost: ");
                      scanf("%lf%lfi", &b.re, &b.im);
                      break;
            case 2: c = csum(a, b);
                      printf("Vsota je %f%+fi\n",c.re, c.im);
                      break;
            case 3: c = cdif(a, b);
                      printf("Razlika je %f%+fi\n",c.re, c.im);
                      break;
            case 4: c = cprod(a, b);
                      printf("Produkt je %f%+fi\n",c.re, c.im);
                      break;
            case 5: c = cquo(a, b);
                      printf("Kvocient je %f%+fi\n",c.re, c.im);
                      break;
            default: continue;
            case 6: exitflag++;
        }
        
    }
}