c

1.  Program

#include

#include

void main()

{

   cout << "Hello World";

   return 0;

getch();

}

Output

            Hello World

2.  Program

#include 

#include

            extern int a, b;

extern int c;

extern float f;

void main ()

{

                        int a, b;

            int c;

            float f;

            a = 10;

            b = 20;

            c = a + b;

             cout << c << endl ;

            f = 70.0/3.0;

            cout << f << endl ;

            return 0;

getch();

}

Output

30

23.3333

3. Program

            #include 

            #include

            int g;

            int main ()

            {

    int a, b;

  a = 10;

  b = 20;

  g = a + b;

  cout << g;

  return 0;

getch(); 

}

Output

                        g:30

4. Program

#include 

#include

int g = 20;

void main ()

{

  int g = 10;

  cout << g;

        return 0;

  getch();

}

Output

               10

5. Program

#include 

#include

void main()

{

            const int  LENGTH = 10;

            const int  WIDTH  = 5;

            const char NEWLINE = '\n';

            int area;  

             area = LENGTH * WIDTH;

            cout << area;

             cout << NEWLINE;

             return 0;

   getch();

}

Output

                    50