// My console graphic program lol
#include <iostream>
#include <ostream>
#include <string>
#include <chrono>
#include <cstdlib>

bool running = true;

struct {
  int off = 0;
  int lit = 1;
} pixel;

class Screen {
public:
  int x;
  int y;
    
  const int* screen[];
    
  void returnToStart() {
    for(int curX = 0; curX < x; curX++) {
      for(int curY = 0; curY < y; curY++) {
        std::cout << "\r\x1b[A";
      }
    }
  }
    
  void clear() {
    for(int curX = 0; curX < x; curX++) {
      for(int curY = 0; curY < y; curY++) {
        screen[(x*curY)+curX] = 0;
        std::cout << "[]";
      }
      std::cout << "\n";    
    }
  }
    
  void drawPixel(int locX, int locY, int state) {
    screen[(x*locY)+locX] = &state;
  }
    
  void drawRect(int locX, int locY) {}
    
  void blit() {
    returnToStart();
    for(int curX = 0; curX < x; curX++) {
      for(int curY = 0; curY < y; curY++) {
        if(screen[(x*curY)+curX] == 0) {
          std::cout << "[]";
        } else if(*screen[(x*curY)+curX] == 1) {
          std::cout << "  ";
        }
      }
      std::cout << "\n";    
    }
  }
    
  Screen(int setX, int setY) {
    x = setX;
    y = setY;
  }
};

int main() {
  int cycles = 0;
  while(running) {
    cycles++;
    Screen screen = Screen(40, 40);
    screen.clear();
    screen.drawPixel(5, 5, pixel.lit);
    screen.blit();
    if(cycles > 30) {
      break;
    }
  }
  return 0;
}

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
}