#include <iostream>
#include <cmath>
using namespace std;
/* function to check where does the point lie on the circles */
void check(int x,int y){
  int d1,d2;
  d1 = sqrt( pow( (x - 6), 2 ) + pow( (y + 5), 2 ) );  //distance from Circle 1
  d2 = sqrt( pow( (x - 12), 2 ) + pow( (y + 7), 2 ) ); //distance from Circle 2 
  if(d1<=3 && d2<=6) //if point lies inside both the circles
    cout<<"\nPoint lies within both circles.";
  else if((d1<=3 && d2>6)||(d1>3 && d2<=6)) //if the point lie inside one of the circle
    cout<<"\nPoint lies within ONLY ONE of the circles.";
  else //if the point lie outside both the circles
    cout<<"\nPoint lies outside both circles.";
}
int main() 
{
    int x,y;
    cout<<"Circle 1: center at ( 6 , -5 ) and radius: 3"<<endl;
    cout<<"Circle 2: center at ( 12 , -7 ) and radius: 5"<<endl;
    cout<<"Please enter the x-coordinate of the test point: "; //input x coordinate
    cin>>x;
    cout<<"\nPlease enter the y-coordinate of the test point: "; //input y coordinate
    cin>>y;
    check(x,y); //calling check() function
    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
}