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Program 1: To swap the values of two variables using third variable.

                  #include<iostream.h>
                  #include<conio.h>

                  void main()
                  {
                      clrscr();

                      int a, b, temp;
                      a = 10;
                      b = 20;

                       cout<<"Values of a and b before swapping are "<<a<< " and " <<b<<
                        ".\n";
                      temp = a;
                      a = b;

                      b = temp;
                       cout<<"Values of a and b after swapping are "<<a<< " and " <<b<<
                        ".\n";
                      getch();
                  }

                  The output of the above program is displayed as follows:

                                    DOSBox 0.74, Cpu speed: max 100% cycles, Frameskip 0, program:   TC
                                 Values of a and b before swapping are 10 and 20.
                                 Values of a and b after swapping are 20 and 10.


                  Constants

                  A constant is a fixed value which does not change its contents during the program execution. In
                  C++, constants can be divided as follows:
                      Integer Constants: An integer constant is a numeric value without any fractions. For example:
                      10, -45, 35, 56, etc.

                      Floating-Point Constants: Any real number in which a fraction is denoted by a decimal
                      symbol. For example: 345.64, -867.22, 0.8763, etc.
                      String Constants: A string value is a collection of one or more characters written in single or
                      double quotes. For example: 'A', "Hello", "Welcome to C++", etc.
                  Delimiters

                  C++ allows some special characters in its coding called delimiters or punctuators. These are:

                  { } ( ) , ; =
                      Braces { }: These are used to specify the start and end of a block of code like main( ) function.
                      Parentheses ( ): These are used with function names to enclose parameters.


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