5.10 When can I reuse the loop control variable i ?

A. Introduction

When writing multiple loops, sometimes the loop control variable i can be reused, sometime not. Have you figured out when it's okay and when it's not? This has to do with the scope of variables.

B. Watch(Slides)

C. Try:

E6.13 Write a program that prints all powers of 2 from 2^0 up to 2^20.