cpp-exception-handling.cpp

// C++ > Debugging > Cpp exception handling
// Handle possible exceptions in a correct way.
//
// https://www.hackerrank.com/challenges/cpp-exception-handling/problem
//

#include <iostream>
#include <stdexcept>

using namespace std;

int largest_proper_divisor(int n) {
    if (n == 0) {
        throw invalid_argument("largest proper divisor is not defined for n=0");
    }
    if (n == 1) {
        throw invalid_argument("largest proper divisor is not defined for n=1");
    }
    for (int i = n/2; i >= 1; --i) {
        if (n % i == 0) {
            return i;
        }
    }
    return -1; // will never happen
}
// (skeliton_head) ----------------------------------------------------------------------

void process_input(int n)
{
    try
    {
        int d = largest_proper_divisor(n);
        cout << "result=" << d << endl;
    }
    catch (exception &e)
    {
        cout << e.what() << endl;
    }
    cout << "returning control flow to caller" << endl;
}

// (skeliton_tail) ----------------------------------------------------------------------
int main() {
    int n;
    cin >> n;
    process_input(n);
    return 0;
}