Constexpr ADC Temperature Table

#include <iostream>
using namespace std;

// Create constexpr lookup table here:
struct table{
    int data[6];
};

constexpr table lookup_table(){
    table t = {};
    int temp = -40;
    for (int i = 0; i < 5; i++) {
        t.data[i] = temp;
        temp += 30;
    }
    t.data[5] = 120;
    return t;
}

constexpr table crc_table = lookup_table();

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

    // Print the value from TEMP_TABLE based on idx
    cout << crc_table.data[idx];
    return 0;
}