Understanding Function Data Handling

Modular Programming • A function is a named collection of statements that performs a specific task. ▪We have created a function named main in all the programs we have written. ▪We have learned to use library functions like pow, sqrt, cos, acos, rand, getline and others. mess with your original data, and that's by design. When you pass a

variable into a function, you're usually just sending a copy. The function can

do whatever it wants to that copy, but your original variable remains untouched and safe.

It’s like giving someone a photocopy; they can’t change your original document. But what if you

want the function to change your data? You can pass it "by reference." This gives the function

direct access to the original variable, not a copy. Any changes it makes are permanent.

This is super useful for functions that need to return multiple values.