The Greatest Common Divisor (GCD), also known as the Highest Common Factor (HCF), is an essential mathematical concept. It represents the largest number that can divide two or more integers without leaving a remainder. One of the most elegant ways to compute the GCD is by using recursion in the C programming language. This method leverages the divide-and-conquer principle to achieve simplicity and efficiency.

https://docs.vultr.com/clang/examples/find-g-c-d-using-recursion