The Assignment That Never Happens

1#include <iostream>
2#include <stdexcept>
3 
4int halve(int value) {
5    if (value % 2 != 0) {
6        throw std::invalid_argument("odd number");
7    }
8    return value / 2;
9}
10 
11int main() {
12    int result = -1;
13    try {
14        result = halve(10);
15        std::cout << "result is " << result << "\n";
16        result = halve(7);
17        std::cout << "result is " << result << "\n";
18    } catch (const std::invalid_argument& e) {
19        std::cout << "error: " << e.what() << "\n";
20    }
21    std::cout << "final result " << result << "\n";
22    return 0;
23}