How to Calculate Logarithm Base 2 in C/C ?

Determining Logarithm Base 2 in C/C

In C/C , the logarithm functions log() and log10() are available for bases e (natural logarithm) and 10 (common logarithm), respectively. However, for base 2 (binary logarithm), you can utilize a simple mathematical formula:

log₂ (x) = log_y (x) / log_y (2)

where y can be any base (e.g., e or 10).

By applying this formula, you can easily calculate the binary logarithm of a given number x using the existing log() function to compute log_y (x). Specifically:

<code class="c">double log2(double x) {
    return log(x) / log(2);
}</code>

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