#include <iostream>
#include <math.h>
using namespace std;

#define PI 3.14
//circle class
class Circle{
  private :
  double radius; /* Circle's radius */
  int x,y; /* Point x & y coordinate */ 
  /* getters and setters methods */
  public :
  int getX() { return x; }    /* Returns the x coordinate */
  int getY() { return y; }    /* Returns the y coordinate */
  int getRadius() { return radius; }    /* Returns the radius */
  void setX(int a) { x = a; }
  void setY(int b) { y = b; }
  void setRadius(double r) { radius = r; }
  Circle() /* Constructor with no arguments */
	{
		radius = 0.0;
		x = 0;
		y = 0;
	}
	Circle (double r) /* Constructor that  only takes the radius */
	{
		radius = r;
	}
	Circle (double r, int xx, int yy) /* takes the radius and location of the coordinates. */
	{
		radius = r;
		x = xx;
		y = yy;
	}
	double getArea(){ /* to get the area of the circle  */
	  return PI * (radius * radius);
	}
	bool collisionDetection(Circle c2){
	  int distX = x - c2.x;
	  int distY = y - c2.y;
	  //cout<<distX<<" "<<distY;
	  //cout<<c2.x<<" "<<c2.y;
	  double distance = sqrt( (distX*distX) + (distY*distY) );
	  if (distance <= radius)
      return true;
    else
      return false;
	}
};
int main() 
{
  Circle circle1(60,10,10);
	Circle circle2(10,40,50);

	cout << circle1.getArea() << endl;
	cout << circle2.getArea() << endl;
	
	cout << circle1.collisionDetection(circle2);
  
  return 0;
}
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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
}