Constexpr ADC Temperature Table

#include <iostream>
using namespace std;

// Compile-time temperature lookup table
constexpr int TEMP_TABLE[6] = { -40, -10, 20, 50, 80, 120 };

int main() {
    int idx;
    cin >> idx;

    cout << TEMP_TABLE[idx];

    return 0;
}

Solving Approach