C++ hello world class program

#include

#include

class message

{

public:

void display()

{

cout << "hello world\n";

}

};

int main()

{

message c;

c.display();

return 0;

}

C++ addition program using class

#include

#include

class mathematics

  int x, y;

public:

  void input()

    cout << "input two inetegers\n";

    cin >> x >> y;

  void add()

    cout << "result = " << x + y;

};

int main()

   mathematics m;

   m.input();

   m.add();

   return 0;

C++ program to reverse a number

#include

 #include

class operations

  long c;

public:

  void inputnumber()

    cout << "input a number\n";

    cin >> c;

  long reversenumber()

    long invert = 0;

    while (c != 0)

      invert = invert * 10;

      invert = invert + c%10;

      c = c/10;

    return invert;

};

int main()

  long result;

  operations t;

  t.inputnumber();

  result = t.reversenumber();

  cout << "number obtained on reversal = " << result;

  return 0;

#include

#include

int main()

   int n, status = 1, num = 3, count, c;

   cout << "enter the number of prime numbers to print\n";

   cin >> n;

   if ( n >= 1 )

      cout << "first " << n <<" prime numbers are :-" << endl;

      cout << 2 << endl;

   for ( count = 2 ; count <=n ;  )

      for ( c = 2 ; c <= (int)sqrt(num) ; c++ )

         if ( num%c == 0 )

            status = 0;

            break;

      if ( status != 0 )

         cout << num << endl;

         count++;

      status = 1;

      num++;

   return 0;

#include

#include

main()

   int n, c, first = 0, second = 1, next;

   cout << "enter the number of terms of fibonacci series you want" << endl;

   cin >> n;

   cout << "first " << n << " terms of fibonacci series are :- " << endl;

   for ( c = 0 ; c < n ; c++ )

      if ( c <= 1 )

         next = c;

      else

         next = first + second;

         first = second;

         second = next;

      cout << next << endl;

   return 0;

#include

#include

main()

   int first[20], second[20], c, n;

   cout << "enter the number of elements in the array ";

   cin >> n;

   cout << "enter elements of first array " << endl;

   for ( c = 0 ; c < n ; c++ )

      cin >> first[c];

   cout << "enter elements of second array " << endl;

   for ( c = 0 ; c < n ; c++ )

      cin >> second[c];

   cout << "sum of elements of two arrays " << endl;

   for ( c = 0 ; c < n ; c++ )

      cout << first[c] + second[c] << endl;

   return 0;

#include

#include

main()

   int m, n, c, d, first[10][10], second[10][10], sum[10][10];

   cout << "enter the number of rows and columns of matrix ";

   cin >> m >> n;

   cout << "enter the elements of first matrix\n";

   for (  c = 0 ; c < m ; c++ )

      for ( d = 0 ; d < n ; d++ )

         cin >> first[c][d];

   cout << "enter the elements of second matrix\n";

   for ( c = 0 ; c < m ;c++ )

      for ( d = 0 ; d < n ; d++ )

            cin >> second[c][d];

   for ( c = 0 ; c < m ; c++ )

      for ( d = 0 ; d < n ; d++ )

         sum[c][d] = first[c][d] + second[c][d];

   cout << "sum of entered matrices:-\n";

   for ( c = 0 ; c < m ; c++ )

      for ( d = 0 ; d < n ; d++ )

         cout << sum[c][d] << "\t";

      cout << endl;

   return 0;

#include

#include

 main()

   int n, max, num, c;

   cout << "enter the number of random numbers you want ";

   cin >> n;

   cout << "enter the maximum value of random number ";

   cin >> max;

   cout << "random numbers from 0 to " << max << " are :-" << endl;

   for ( c = 1 ; c <= n ; c++ )

      num = random(max);

      cout << num << endl;

   return 0;

#include

#include

class programming

   private:

      int variable;

   public:

      void input_value()

         cout << "in function input_value, enter an integer\n";

         cin >> variable;

      void output_value()

         cout << "variable entered is ";

         cout << variable << "\n";

};

main()

   programming object;

   object.input_value();

   object.output_value();

   return 0;

#include

#include

          class game

private:

  int goals;

public:

  game()

    goals = 0;

  int getgoals()

    return goals;

  void incrementgoal()

    goals++;

};

int main()

  game football;

  cout << "number of goals when game is started = " << football.getgoals() <

  football.incrementgoal();

  football.incrementgoal();

  cout << "number of goals a little later = " << football.getgoals() << endl;

  return 0;

#include

       #include

long add(long, long);

float add(float, float);

int main()

   long a, b, x;

   float c, d, y;

   cout << "enter two integers\n";

   cin >> a >> b;

   x = add(a, b);

   cout << "sum of integers: " << x << endl;

   cout << "enter two floating point numbers\n";

   cin >> c >> d;

   y = add(c, d);

   cout << "sum of floats: " << y << endl;

   return 0;

long add(long x, long y)

   long sum;

   sum = x + y;

   return sum;

float add(float x, float y)

   float sum;

   sum = x + y;

   return sum;

#include

#include

int main()

   int n, *pointer, c;

   cout << "enter an integer\n";

   cin >> n;

   pointer = new int[n];

   cout << "enter " << n << " integers\n";

   for ( c = 0 ; c < n ; c++ )

      cin >> pointer[c];

   cout << "elements entered by you are\n";

   for ( c = 0 ; c < n ; c++ )

      cout << pointer[c] << endl;

   delete[] pointer;

   return 0;

#include

#include

class programming

public:

  void output();

};

void programming::output()

  cout << "function defined outside the class.\n";

int main()

  programming x;

  x.output();

  return 0;