#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;
}