Why add a return statement for the main function in C important?

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What should main() return in C and C++? 19 answers

Why is adding a return statement for the main() function in C important if the programs I make runs the same without it?

Is there a disadvantage in my programs if I omitted the return statement in the main() function?

It is by convention that you tell the operating system if your program exited successfully(returning 0), or if there was an error(for example, by returning an error code).

To remain more standards compliant, use return EXIT_SUCCESS or return EXIT_FAILURE.

Use return vs return 0 for the main function in c

In my book on C, the author usually formats main() like this: main() { /* Some code */ return; } But sometimes, he formats main() like this: main() { /* Some code */ return 0; } What's the difference? Does it matter?C standard says that (draft n1570)

Why does Rust have no return value in the main function and how to return a value anyway?

In Rust the main function is defined like this: fn main() { } This function does not allow for a return value though. Why would a language not allow for a return value and is there a way to return something anyway? Would I be able to safely use the C

Why is_a_? Returns false for the Hash class?

Why is_a? returns false for a Hash class? Example: value = {"x" => 3, "y" => 2} puts value.class puts value.is_a?(Hash) Output: Hash false Im using Ruby 1.9.2 UPDATED: full source of my class: class LatLng include Mongoid::Fields

How can we use the function return value in the main function in if other condition in c. I do not want to use printing in my Isprime_function file

File - Isprime_function.c #include <stdio.h> #include "all_header.h" int isprime(int input) { int i, stop = 0; if(input >= 1) { for(i=2; i<=input/2; i++) { if(input%i==0) { stop = 1; break; } } if(stop==0 && input!=1) { print

Is it possible to use an append function in a return statement for the purposes of a recursive Python procedure?

Is it possible to use an append function in a return statement? If I say: def test_func(n): a=[1,2,3] a.append(n) return a print test_func(6) I get: [1,2,3,6] But if I say: def test_func(n): a=[1,2,3] return a.append(n) print test_func(6) I get: None

Why the main name for the main () function

Why the function name main() is retained in many languages like C, C++, Java? Why not any other names for that function? Is there any common structure for all these 3 main() (in C, C++, Java)There are a lot of silly and not very respectful answers he

Why DateTime.TryParse () returns true for the culture & ldquo; in-NZ & rdquo; when MMddyyyy is past?

I have the following code: DateTime.TryParse("06-28-2012", new System.Globalization.CultureInfo("en-NZ"), System.Globalization.DateTimeStyles.AssumeLocal, out date); I'm not sure why this is returning true since if I go into my Regiona

return statement in the void function in C

In the following program, Why compiler does not gives any error or warning? cc -Wall -pedantic my_program.c code here: #include <stdio.h> void f() { return; // return statement in void function } int main() { f(); return 0; } I have compiled the pro

What is the correct return type for the C function that returns different data types

I was once asked to write a function which will return a pointer to some data in the memory upon some successful condition else it should return "-1". In this case, what would be the correct return type. If I only had to return the data then I w

How do I get a return value for the javascript function after .load ()?

So yesterday I discovered the possibility of calling another function after a load. Now, I am trying to get a php variable that is generated from the loaded page. Here is the code -- I think I'm just missing a few lines or so. function compute(id) {

Require.js - sets the return value for the callback function

This question already has an answer here: Unable to call functions with Require.js 2 answers It seems like require calls are executed asynchronously, allowing program flow to continue around them. This is problematic when I'm trying to use a value se

can not understand the return statement in the isEmpty function of the stack implementation

I have isEmpty() function in my stack. And it looks something like below. bool Mystack<T>::isEmpty() const //function 1 { if(top==-1) return true; else return false; } I saw a couple of online code for isEmpty(), which I could not understand. Below

Is it possible in Common Lisp to disable the return values for the specified functions?

I would like to know whether or not it's possible to disable return values for specified functions. I am using compiler SBCL. I am asking this, because it takes a while to print the return value, and I don't even need it. Any ideas? OK, it does the j

Why am I becoming wrong for the isclass function?

I'm using the following code to determine whether the input parameter is a class or a variable: class Trajectory(): ... print inspect.isclass( Trajectory() ) where the Trajectory is a class, but when I'm calling this function I'm receiving false. Why

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