How to draw triangle in c programming language using openGL utilities like glut and glew

Triangle in openGL

code:

	//necessary header
	#include<stdlib.h>
	#include<math.h>
	#include<Windows.h>
	//Opengl utilities
	#include <GL\glew.h>
	#include<GL/GLU.h>
	#include<GL/GL.h>
	#include <GL\freeglut.h>
	//function
	void render(void) {
	//clear
	glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);
	//reset
	glLoadIdentity();
	//each pixel size
	glPointSize(100.0);
	//draw things
	glBegin(GL_TRIANGLES);
	glColor3f(1,0,0);
	glVertex2f(-0.5, -0.5);
	glColor3f(0,1,0);
	glVertex2f(0.5, -0.5);
	glColor3f(0,0,1);
	glVertex2f(0, 0.5);
	glEnd();
	//display for swaping buffer yield smooth animation
	glutSwapBuffers();
	}
	void initBackground() {
	glClearColor(0.0, 0.0, 0.0, 1);
	glColor3f(1.0, 1.0, 1.0);
	}
	void keyboard( unsigned char c, int x, int y) {
	if (c == 'a') {
	exit(0);
	}
	}
	void mouse(int buttom, int state, int x, int y) {
	if (buttom == GLUT_RIGHT_BUTTON) {
	exit(0);
	}
	}
	//main function
	int main( int argc, char* argv[]) {
	//openGL initialization code (optional)
	glutInit(&argc, argv);
	//Specify the display mode -RBG or color index, single or double buffer
	glutInitDisplayMode(GLUT_DEPTH | GLUT_RGBA | GLUT_DOUBLE);
	//Creating window named "Triangle in openGL"
	//with starting point (100,100)
	//with screen resolution 640*480
	glutInitWindowPosition(100,100);
	glutInitWindowSize(640, 480);
	glutCreateWindow("Triangle in openGL");
	//Register the call back functions
	glutDisplayFunc(render);
	glutKeyboardFunc(keyboard);
	glutMouseFunc(mouse);
	//for changing background properties
	initBackground();
	//Program goes into infinite loop waiting for events
	glutMainLoop();
	return 0;
	}

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