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MORE SOLVED PROGRAMS

                  Program 3: To swap the values of two variables without using third variable.
                  #include<iostream.h>

                  #include<conio.h>
                  void main()
                  {
                  clrscr();

                  int a, b;
                  a = 10;
                  b = 20;
                  cout<<”Values of a and b before swapping are “<<a<< “ and “ <<b<< “.\n”;
                  a = a + b;
                  b = a - b;

                  a = b - a;
                  cout<<”Values of a and b after swapping are “<<a<< “ and “ <<b<< “.”;
                  getch();
                  }

                  Preceding program shows the same output as Program 1.
                  Program 4: To calculate the area of a circle of radius 5 cm.

                  #include<iostream.h>
                  #include<conio.h>
                  void main()
                  {
                  clrscr();

                  int radius = 5;
                  float pi = 3.14, area = 0;
                  area = pi * radius * radius;
                  cout<<”Area of circle is: “<<area;
                  getch();
                  }
                     Recap




                          A character set refers to the letters, digits or special symbols that can be used to write programs
                         in C++ language.

                         Tokens are the smallest individual units of a C++ program.
                         Keywords are the reserved words which cannot be used as variable names as they carry a
                         special meaning for the compiler.
                         A data type specifies the type of value a variable can contain.



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