Constants

In contrast to the variable whose contents can change during the execution of the program while the contents of the constants can not be changed.
Constants are fixed values ​​that are similar to variable declaration, its value only course that can not be changed.

There are two ways to declare the constants:
- After the declaration header file using # define
- In the function by using the const

/ / declare constant

# include <iostream>
# include <conio.h>
# define phi 3:14
# define r1 3
# define r2 10.7
# define kar 'A'
# define the text "Examples of constant declarations"
# define x true
main () {
   / / calling constants
   court <<text <<"\ n";
   court <<kar <<"\ n";
   court <<x <<"\ n";
   court <<pi <<"\ n";
   court <<r1 <<"\ n";
   court <<r2 <<"\ n";
getch ();}