C++ - For Loop

Overview

Estimated time: 25–35 minutes

Iterate with classic for and range-based for loops. Learn indices vs iterators and nesting.

Learning Objectives

• Write counting loops and iterate ranges.
• Use range-based for for container traversal.

Prerequisites

• C++ - Switch

Counting loop

for (int i=0;i<5;++i) { /*...*/ }

Range-based for

#include 
for (int x : std::vector{1,2,3}) { /*...*/ }

Common Pitfalls

• Modifying a container while iterating can invalidate iterators.