Complex

#include <stdio.h>
#include <stdlib.h>

typedef struct
{
    double x;
    double y;
}Complex;

void input(Complex *num)
{
    printf("Enter the real part ");
    scanf("%lf",&num->x);
    printf("Enter the imaginary part ");
    scanf("%lf",&num->y);
}

Complex add(Complex num1,Complex num2)
{
    Complex sum;
    sum.x = num1.x + num2.x;
    sum.y = num1.y + num2.y;
    return sum;
}

Complex subtract(Complex num1,Complex num2)
{
    Complex diff;
    diff.x = num1.x - num2.x;
    diff.y = num1.y - num2.y;
    return diff;
}

Complex multiply(Complex num1,Complex num2)
{
    Complex product;
    product.x = (num1.x*num2.x) - (num1.y*num2.y);
    product.y = (num1.x*num2.y) + (num2.x*num1.y);
    return product;
}

Complex divide(Complex num1,Complex num2)
{
    Complex div;
    div.x = ((num1.x*num2.x) + (num1.y*num2.y))/((num2.x*num2.x)+(num2.y*num2.y));
    div.y = ((num2.x*num1.y) - (num1.x*num2.y))/((num2.x*num2.x)+(num2.y*num2.y));
    return div;
}

void display(Complex num)
{
    printf("%.2lf+i%.2lf \n",num.x,num.y);
}

int main()
{
    Complex num1,num2;
    int choice;
    do
    {
        printf("Entering the first complex number \n");
        input(&num1);
        printf("Entering the second complex number \n");
        input(&num2);
        printf("Press 1 to add \n ");
        printf("Press 2 to subtract \n ");
        printf("Press 3 to multiply \n ");
        printf("Press 4 to divide \n ");
        printf("Press 5 to exit \n ");
        printf("Enter your choice [1-5] ");
        scanf("%d",&choice);
        switch(choice)
        {
            case 1:
                printf("The sum is ");
                display(add(num1,num2));
                break;
            case 2:
                printf("The difference is ");
                display(subtract(num1,num2));
                break;
            case 3:
                printf("The product is ");
                display(multiply(num1,num2));
                break;
            case 4:
                printf("The quotient is ");
                display(divide(num1,num2));
                break;
            case 5:
                break;
            default:
                printf("Bhag bc");
        }
    }
    while(choice!=5);
    return 0;
}