A Level Computer Science Home Tutors in DHA Islamabad for Cambridge Students

Both repetition tools can solve the same problems. Loops repeat a block with an explicit counter or condition. Recursion solves a problem by calling the same function on a smaller instance until a base case stops the chain.

Factorial example

Loop: multiply 1 × 2 × … × n in a running product.
Recursion: n! = n × (n − 1)!, with 0! = 1 as the base case.

Recursion is natural for tree structures and divide-and-conquer. Loops are often clearer for simple counting. Deep recursion without a base case overflows the call stack.

A Level Computer Science support in DHA Islamabad can require one loop version and one recursive version of the same small problem.