C++ Examples

Write a C++ Program to print a welcome text in a separate line.

Singleton C++ example

#include <iostream>
using namespace std;

class a1 {
   static a1 *i;
   
   // Variable declaration
  
   int x;
  
   // Private constructor 
   
   a1() {
      x = 5;
    }

   public:
   static a1 *getInstance() {
      if (!i)
      i = new a1;
      return i;
   }
    int getData() {
     
      return this -> x;
   }

   void setData(int x) {
      this -> x = x;
     
   }
};
   //Initialize pointer to NULL

a1 *a1::i = NULL;

int main(){
   a1 *obj1 = obj1->getInstance();
   cout << obj1->getData() << endl;
   obj1->setData(400);
   cout << obj1->getData() << endl;
   return 0;
}

Output

5
400