What is the use of return()

Answer 1

here is a short tutorial about functions in c language. this also covers the return statement:
https://www.sololearn.com/learn/C/2929/?ref=app

Answer 2

https://docs.microsoft.com/en-us/cpp/c-language/return-statement-c#:~:text=A%20return%20statement%20ends%20the,value%20to%20the%20calling%20function

Answer 3

Hope this helps