Sample GL code

main.cpp

#include<GL/glew.h>
#include <GLFW/glfw3.h>
//for input and output
#include<iostream>
#include<stdlib.h>
#include<Windows.h>
#include<conio.h>
using namespace std;
#include<fstream>
#include<string>
#include<sstream>
int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;
        
    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "OpenGL", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }
    /* Make the window's context current */
    glfwMakeContextCurrent(window);

    int x = 1;

    while(x)
    {
        if (_kbhit())
        {
            switch (_getch())
            {
                case 's': 
                    x = 0; // closes the window if 's' is pressed
                    break;
            }
        }
    }

    glfwTerminate();
    return 0;
}