#include <msoftcon.h> //for graphics functions
////////////////////////////////////////////////////////////////
class shape {
protected:
	int xCo, yCo; //coordinates of shape
	color fillcolor; //color
	fstyle fillstyle; //fill pattern
public: //no-arg constructor
	shape() : xCo(0), yCo(0), fillcolor(cWHITE),
		fillstyle(SOLID_FILL)
	{ } //4-arg constructor
	shape(int x, int y, color fc, fstyle fs) :
		xCo(x), yCo(y), fillcolor(fc), fillstyle(fs)
	{ }
	void draw() const //set color and fill style
	{
		set_color(fillcolor);
		set_fill_style(fillstyle);
	}
};
////////////////////////////////////////////////////////////////
class circle : public shape
{
private:
	int radius; //(xCo, yCo) is center
public:
	circle() : shape() //no-arg constr
	{ }
	//5-arg constructor
	circle(int x, int y, int r, color fc, fstyle fs)
		: shape(x, y, fc, fs), radius(r)
	{ }
	void draw() const //draw the circle
	{
		shape::draw();
		draw_circle(xCo, yCo, radius);
	}
};
////////////////////////////////////////////////////////////////
class rect : public shape
{
private:
	int width, height; //(xCo, yCo) is upper-left corner
public:
	rect() : shape(), height(0), width(0) //no-arg ctor
	{ } //6-arg ctor
	rect(int x, int y, int h, int w, color fc, fstyle fs) :
		shape(x, y, fc, fs), height(h), width(w) { }
	void draw() const //draw the rectangle
	{
		shape::draw();
		draw_rectangle(xCo, yCo, xCo + width, yCo + height);
		set_color(cWHITE); //draw diagonal
		draw_line(xCo, yCo, xCo + width, yCo + height);
	}
};
////////////////////////////////////////////////////////////////
class tria : public shape
{
private:
	int height; //(xCo, yCo) is tip of pyramid
public:
	tria() : shape(), height(0) //no-arg constructor
	{ } //5-arg constructor
	tria(int x, int y, int h, color fc, fstyle fs) :
		shape(x, y, fc, fs), height(h)
	{ }
	void draw() const //draw the triangle
	{
		shape::draw();
		draw_pyramid(xCo, yCo, height);
	}
};
////////////////////////////////////////////////////////////////
int main()
{
	init_graphics(); //initialize graphics system
	circle cir(40, 12, 5, cBLUE, X_FILL); //create circle
	rect rec(12, 7, 10, 15, cRED, SOLID_FILL); //create rectangle
	tria tri(60, 7, 11, cGREEN, MEDIUM_FILL); //create triangle
	cir.draw(); //draw all shapes
	rec.draw();
	tri.draw();
	set_cursor_pos(1, 25); //lower-left corner
	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
}