Conversion between decibel and linear scales

main.cpp

#include <stdio.h>
#include <math.h>

static double ConvertDecibelsToLinear(double dB)
{
    if(dB <= -60.0)
    {
        return 0.0;
    }
    return pow(10.0, dB/20.0);
}

static double ConvertLinearToDecibels(double linear)
{
    if(linear <= 0.0)
    {
        return -60.0;
    }
    return 20.0 * log10(linear);
}

int main(int argc, char* argv[])
{
    printf("-6dB in linear is %.2f\n", ConvertDecibelsToLinear(-6.0));
    printf("0.25 in decibels is %.2f\n", ConvertLinearToDecibels(0.25));
    return 0;
}