Compute ADC Voltage Scale

#include <iostream>
#include <cstdint>

using namespace std;

// TODO: Implement constexpr int32_t computeScale(int32_t maxAdc, int32_t maxVoltage_mV)
constexpr int32_t computeScale(int32_t maxAdc, int32_t maxVoltage_mV)
{
    // I want to computer microvolts per ADC count at compile time
    /*
        maxVoltage = 3300 mV
        maxADC = 4095

        y = mx + b
        y(x) = (3300 - 0)/(4095 - 0) * (x - 0) + ymin

        y(x) = (3300/4095) * x + 0

        y(x) = (3300/4095) * x

        y(x) = ((3300/4095) * (1000)) * x
    */

    int32_t maxVoltage_uV = maxVoltage_mV*1000;
    return maxVoltage_uV / maxAdc;
}

// TODO: Define constexpr int32_t SCALE_UV = ...
constexpr int32_t SCALE_UV = computeScale(4095, 3300);

int main() {
    int32_t x;
    if (!(cin >> x)) return 0;

    // TODO: Compute voltage_uv using SCALE_UV
    int32_t voltage_uV = x*SCALE_UV;
    // TODO: Print the result
    cout << voltage_uV;

    return 0;
}

Solving Approach