What is function in c program ?

Answer 1

A function is a group of statements that together perform a task. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions. ... A function declaration tells the compiler about a function's name, return type, and parameters.

https://www.tutorialspoint.com/cprogramming/c_functions.htm

https://www.javatpoint.com/functions-in-c

https://www.programiz.com/c-programming/c-functions-examples

Answer 2

function paintBrush(color){
Instructions
}

You can use a paint brush wherever you want to use with different colours.

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Answer 3

NEZ very nice a simplified answer. Well puts().