#include <stdio.h>
#include <malloc.h>


// define a structure
struct complexStruct
{
    double real;
    double imag;
} ;

// make a typedef
typedef struct complexStruct complex;

// function to create a new complex number
complex newComplex(double r, double i)
{   // get memory
    complex * z = calloc(1, sizeof(complex));
    z->real = r; // store parameters in memory
    z->imag = i;
    return *z; // return what is stored at z
}

// add two complex numbers
complex add(complex x, complex y)
{ // similar to newComplex
    complex * z = calloc(1, sizeof(complex));
    z->real = x.real+y.real;
    z->imag = x.imag+y.imag;
    return *z;
}

// output a complex number
void output(complex x)
{
    if (x.imag<0)
        printf("%f %fi\n",x.real,x.imag);
    else
        printf("%f +%fi\n", x.real, x.imag);

}

int main()
{
    complex num1 = newComplex(1,2); // num1 is 1+2i
    complex num2 = newComplex(3,4);

    complex num3 = add(num1, num2);
    output(num3); // 4 + 6i
    complex num4= newComplex(1,-4);
    complex num5= add(num1, num4);
    output(num5); // 2-2i

}