GCD (Greatest Common Divisor) is the largest positive integer that divides two numbers without leaving a remainder. For example, the GCD of 18 and 24 is 6.

Why is finding GCD important in programming?

GCD is crucial in simplifying fractions, modular arithmetic, cryptographic algorithms, and solving mathematical problems efficiently in number theory.

Can GCD be calculated for negative numbers?

Yes, GCD can be calculated for negative numbers. However, it is always returned as a positive integer.

How does Euclid’s algorithm work for finding GCD?

Euclid’s algorithm repeatedly replaces the larger number with the remainder of dividing the larger number by the smaller one until the remainder is 0. The last non-zero divisor is the GCD.