Why do we write return 0 at the end of a program?

The main function is generally supposed to return a value and after it returns something it finishes execution. The return 0 means success and returning a non-zero number means failure. Thus we “return 0” at the end of main function.

Why we should have return 0 in the main function?

Is return 0 the same as return?

When you write return you are actually returning void value and you are simply returning 0 when you write return 0. So, you generally use return 0 when return type is int and return when return type is void.

What is the difference between return 0 and return 1?

return 0: A return 0 means that the program will execute successfully and did what it was intended to do. return 1: A return 1 means that there is some error while executing the program and it is not performing what it was intended to do.

Why do we use return 1 in Java?

indexOf(int pos) – Returns the index within this string of the first occurrence of the specified character or -1 if the character does not occur. Your method has no return type, Provide a return type of int in your method. And return -1 means nothing in java, you are just returning a int value, thats it.

What happens if there is no return statement?

If no return statement appears in a function definition, control automatically returns to the calling function after the last statement of the called function is executed. In this case, the return value of the called function is undefined. If a return value isn’t required, declare the function to have void return type.

Is a return statement necessary?

For a function of return type void , a return statement is not strictly necessary. In other words, an implicit return takes place upon completion of the final statement, and control automatically returns to the calling function. If a return statement is used, it must not contain an expression.

What is the use of return statement in a function?

A return statement ends the execution of a function, and returns control to the calling function. Execution resumes in the calling function at the point immediately following the call. A return statement can return a value to the calling function.