These notes provide a complete and easy explanation of functions in C++ designed especially for beginners and non-computing students. The material covers definition, syntax, function declaration, function calling, return types, and different types of user-defined functions with clear program examples and outputs.

Students will learn how to create and use functions such as sum, multiplication, square of a number, even/odd checking, and finding maximum numbers. These notes help build strong programming logic and are ideal for school, college, and beginner-level C++ learners who want to understand functions step-by-step with practical programs.