In c++ when we use return 0,and without return 0 show sqme result. Why??

Question

What is its use or difference??

Answer 1

A program will return a number to the operating system to tell it how the execution went. A 0 value means the execution went well, whereas a non-0 value means there was an error. For example if you run "ftp localhost" and you don't have a server, it might return a non-0 value to let the OS know it wasn't able to do what it wanted.

If your main() function doesn't return a value, the compiler may return 0 by default, but it's undefined behavior.

Answer 2

any easy way for this

Answer 3

Can you attach your code here?