LAB1_Task2

#include <iostream>

using namespace std;

int operation(int x, int y, int z);

int main()
{
    int x, y, z;

    cout << "\nInput x, y, z: " << endl;
    cin >> x >> y >> z;
    cout << endl;
    
    const int COMPARABLE = 20;
    const int TARGET = 120;
    
    int sum = x + y + z;
    
    int result = operation(sum, COMPARABLE, TARGET);

    cout << "\nResult of calculation: " << endl;

    cout << "sum of elements x, y, z is " << sum << ' ';
    if(!result)
        cout <<"and it's greater than/equals to " << COMPARABLE;
    else
        cout << "and it's less than " << COMPARABLE << " and " << result << " is left to reach " << TARGET;
    return 0;
}

int operation(int sum, int comparable, int target)
{
    if(sum >= comparable)
        return 0;
    return target - sum;
}