Why is exit(0) giving me errors?

Question

So I've been following a tutorial and when I tried to compile the below code:

#include <glut.h>
#include <iostream>

void render(void);
void keyboard(unsigned char c, int x, int y);
void mouse(int button, int state, int x, int y);

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(640, 480);
    glutCreateWindow("Test GLUT App");

    glutDisplayFunc(render); // render
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);

    glutMainLoop(); // initialization finished. start rendering
}

void render(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_TRIANGLES);
    glColor3f(0.5, 0.2, 0.9);
    glVertex2f(-0.5, -0.5);
    glColor3f(0.1, 0.2, 0.5);
    glVertex2f(0.0, -0.5);
    glColor3f(0.3, 0.9, 0.7);
    glVertex2f(0.0, 0.5);
    glEnd();

    glutSwapBuffers();  
}

void keyboard(unsigned char c, int x, int y)
{
    if(c == 27)
    {
        exit(0);
    }
}

void mouse(int button, int state, int x, int y)
{
    if(button == GLUT_RIGHT_BUTTON)
    {
        exit(0);
    }
}

I get 3 errors out of nowhere:

Error 1 error C2381: 'exit' : redefinition; __declspec(noreturn) differs c:\program files (x86)\microsoft visual studio 10.0\vc\include\stdlib.h 353

Error 2 error C3861: 'exit': identifier not found ....main.cpp 45

Error 3 error C3861: 'exit': identifier not found ....main.cpp 53

Does anyone see why this error appears? Im using VS2010.

possible duplicate of [GLUT exit redefinition error](http://stackoverflow.com/questions/14402/glut-exit-redefinition-error) — RedX, Jul 23 '12 at 07:00

score 7 · Accepted Answer · edited May 23 '17 at 12:07

7

You need to #include <cstdlib>.

edit:

You are probably following a very known tutorial that provides a header file for you.

This will help you then GLUT exit redefinition error

edited May 23 '17 at 12:07

Community

1
1

answered Jul 23 '12 at 06:56

RedX

14,749
1
53
76

If GLUT is declarting `exit` in the global namespace, it's a bad sign with regards to the quality of the library. – James Kanze Jul 23 '12 at 07:31
@JamesKanze Bad or not it is (i think) the only one available out there that makes entry easy for beginners. – RedX Jul 23 '12 at 07:37
@RedX I don't see where it helps anyone. If the library needs `std::exit`, it should include ``. Defining `exit` in global namespace results in undefined behavior, and is _never_ correct. – James Kanze Jul 23 '12 at 07:51
@JamesKanze the library itself is not C++ only C because opengl is only C. So there is no options to define namespaces. But IMHO you are right. I have no idea why it defines an `exit` function. – RedX Jul 23 '12 at 08:17

score 2 · Answer 2 · answered Dec 18 '15 at 11:14

2

If your Visual Studio throws a build error saying IntelliSense did not identify 'exit' then you must include process.h

answered Dec 18 '15 at 11:14

flare111

21
1

score 0 · Answer 3 · answered Jul 23 '12 at 07:00

0

Try adding using namespace std to the top. I'm not sure if this will fix it but i had a similar error earlier and that fixed it. good luck.

answered Jul 23 '12 at 07:00

abk

301
2
4
16

score 0 · Answer 4 · answered Nov 26 '13 at 03:33

0

u need to declare header simple as work , works in my comp

#include <stdlib.h>
#include <cstdlib>
#include <glut.h>
#include <iostream>

answered Nov 26 '13 at 03:33

Jefferson X Masonic

583
2
12
27

Why is exit(0) giving me errors?

4 Answers4