What are the ways to replace the use of recursive calls in a program?

Recursive calls can be replaced with the following methods:

1. Iterative approach — use loops (for, while) instead of recursion. This often reduces memory usage and avoids stack overflow.

Example: calculating factorial iteratively instead of recursively.

# Recursive
# def factorial(n):
#     if n == 0:
#         return 1
#     else:
#         return n * factorial(n-1)

# Iterative

def factorial(n):
    result = 1
    for i in range(2, n+1):
        result *= i
    return result

2. Using a stack or custom data structure — simulate recursion with an explicit stack.

3. Tail recursion — if the language supports tail recursion optimization, rewrite the function so that the recursive call is the last operation.

4. Dynamic programming — store intermediate results to avoid repeated calls.

The choice of method depends on the problem and memory and time constraints.