Struct add, sub, mul, div

//Bismillahir Rahman-ir Rahim
#include <bits/stdc++.h>
using namespace std;
typedef struct {
    int p;
    int q;
}rational;
int GCD(int a, int b){
     int temp;
     while(b != 0){
        temp = b;
        b = a % b;
        a = temp;
     }
     return a;
}

int LCM(int a, int b){
    int gcd = GCD(a, b);
    int lcm = a*b / gcd;
    return lcm;
}
void addition (rational *s1, rational *s2, rational *s3)
{
    s3 -> q = LCM(s1 -> q, s2 -> q);
    s3 -> p = (s1 -> p)*(s3 -> q / s1 -> q) + (s2 -> p)*(s3 -> q / s2 -> q);
}
void substraction (rational *s1, rational *s2, rational *s3)
{
    s3 -> q = LCM(s1 -> q, s2 -> q);
    s3 -> p = (s1 -> p)*(s3 -> q / s1 -> q) - (s2 -> p)*(s3 -> q / s2 -> q);
}
void multiply (rational *s1, rational *s2, rational *s3)
{
    s3 -> p = (s1 -> p)*(s2 -> p);
    s3 -> q = (s1 -> q)*(s2 -> q);
    int gcd = GCD(s3 -> p, s3 -> q);
    s3 -> p = (s3 -> p)/gcd;
    s3 -> q = (s3 -> q)/gcd;
}
void divide (rational *s1, rational *s2, rational *s3)
{
    s3 -> p = (s1 -> p)*(s2 -> q);
    s3 -> q = (s1 -> q)*(s2 -> p);
    int gcd = GCD(s3 -> p, s3 -> q);
    s3 -> p = (s3 -> p)/gcd;
    s3 -> q = (s3 -> q)/gcd;
}
int main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    rational r1, r2, r3;
    r1.p = 6;
    r1.q = 4;
    r2.p = 2;
    r2.q = 4;
    divide(&r1, &r2, &r3);
    cout << r3.p<<"/"<<r3.q << endl;

    return 0;
}