Functions with 2d Arrays

I make lots of mistakes while conding.

#include<iostream>
using namespace std;
struct bef{
    double x;double y;
};
struct aft{
    double s;double t;
};

aft transfer(bef xy);
void show_result(aft st);

int main(){
    bef num_1;
    aft num_2;
    cin >> num_1.x >> num_1.y;
    num_2 =  transfer(num_1);
    show_result(num_2);

    return 0;
}

aft transfer(bef xy){
    //xy.x += 1;
    //xy.y -= 1;
    aft result;
    result.s = xy.x + 1;
    result.t = xy.y - 1;

    return result;
}
void show_result(aft st){
    cout << st.s;
    cout << " ";
    cout << st.t;
}