Replace all 0's with 1's Dry Run in PYTHON

Replace all 0's with 1's is an interactive PYTHON dry run visualizer from the Recursion programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Replace all 0's with 1's Program Code

def replace_zero(n):
    if n == 0:
        return 1
    if n < 10:
        return 1 if n == 0 else n
    last = n % 10
    if last == 0:
        last = 1
    return replace_zero(n // 10) * 10 + last

num = 1020450
print(f"Original: {num}")
print(f"After replacing 0 with 1: {replace_zero(num)}")

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