Answer 1

I think you question is about the diffrence between a void function and a function that returns somthing.

void msg(String y){print somthing(y);}

/* ⬆Does not return anything ie theres no return statement in the method body to return a value but it will still print somthing to console when its called */

int msg(int i,int j){ do somthing then>; return new value;}

/*⬆This method has a return statment in the method body so this one does some stuff and then returns a new value*/

/* so basicly if it doesnt have the "return" keyword in the function(){body} it doesnt return anything ☺*/