#include <GL/glut.h>

// Initialization function
void init() {
    glClearColor(0.5f, 0.8f, 1.0f, 1.0f); // Background color (sky blue)
    glEnable(GL_DEPTH_TEST); // Enable depth testing
}

// Display function
void display() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();

    // Camera settings
    gluLookAt(0.0, 5.0, 10.0,  // Eye position
              0.0, 0.0, 0.0,   // Look-at point
              0.0, 1.0, 0.0);  // Up direction

    // Draw a simple chair
    glPushMatrix();
    glTranslatef(-3.0, 0.0, 0.0);
    drawChair();
    glPopMatrix();

    // Draw a simple table
    glPushMatrix();
    glTranslatef(3.0, 0.0, 0.0);
    drawTable();
    glPopMatrix();

    // Swap buffers
    glutSwapBuffers();
}

// Simple chair drawing function
void drawChair() {
    glPushMatrix();
    glColor3f(0.4f, 0.2f, 0.1f);
    glScalef(1.0f, 0.1f, 1.0f);
    glutSolidCube(2.0f); // Seat
    glPopMatrix();

    glPushMatrix();
    glColor3f(0.4f, 0.2f, 0.1f);
    glTranslatef(0.0f, 1.0f, -0.9f);
    glScalef(1.0f, 2.0f, 0.1f);
    glutSolidCube(2.0f); // Backrest
    glPopMatrix();
}

// Simple table drawing function
void drawTable() {
    glPushMatrix();
    glColor3f(0.6f, 0.3f, 0.0f);
    glScalef(3.0f, 0.1f, 2.0f);
    glutSolidCube(2.0f); // Tabletop
    glPopMatrix();

    glPushMatrix();
    glColor3f(0.6f, 0.3f, 0.0f);
    glTranslatef(2.8f, -1.0f, 1.8f);
    glScalef(0.1f, 2.0f, 0.1f);
    glutSolidCube(2.0f); // Table leg
    glPopMatrix();

    glPushMatrix();
    glColor3f(0.6f, 0.3f, 0.0f);
    glTranslatef(-2.8f, -1.0f, 1.8f);
    glScalef(0.1f, 2.0f, 0.1f);
    glutSolidCube(2.0f); // Table leg
    glPopMatrix();

    glPushMatrix();
    glColor3f(0.6f, 0.3f, 0.0f);
    glTranslatef(2.8f, -1.0f, -1.8f);
    glScalef(0.1f, 2.0f, 0.1f);
    glutSolidCube(2.0f); // Table leg
    glPopMatrix();

    glPushMatrix();
    glColor3f(0.6f, 0.3f, 0.0f);
    glTranslatef(-2.8f, -1.0f, -1.8f);
    glScalef(0.1f, 2.0f, 0.1f);
    glutSolidCube(2.0f); // Table leg
    glPopMatrix();
}

// Reshape function
void reshape(int w, int h) {
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0, (double)w / (double)h, 1.0, 100.0);
    glMatrixMode(GL_MODELVIEW);
}

// Main function
int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(800, 600);
    glutCreateWindow("OpenGL Environment");

    init();

    glutDisplayFunc(display);
    glutReshapeFunc(reshape);

    glutMainLoop();
    return 0;
}
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C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}