News About
CPP Learning:
Facts about CPP
CPP Development cycle and tools
Quick & dirty into CPP
CPP Namespace
CPP Variables and Constants
CPP Variables types
CPP Defining Variables
CPP Keywords
CPP Typedef
CPP Characters and Integers
CPP Constants
CPP Statements and Expressions
CPP Arrays
CPP Program flow
CPP conditions
CPP if and else
CPP switch
CPP while loop
CPP do .. while loop
CPP for loop
CPP Functions
CPP Functions
CPP Function Prototyping
CPP Function Variable Scope.
CPP Function Default Parameters
CPP Function Overloading
CPP Inline Function
CPP Functions call itself
CPP Pointers to Functions
CPP Pointers to Class Methods
CPP Friend Functions and Classes
CPP Objects and Classes
CPP Objects
CPP Classes and Member Types
CPP Methods
CPP Advance Methods
CPP pointers and the free store
CPP Understanding Pointers
CPP Using the Free Store
CPP Accessing Class Members
CPP this Pointer
CPP Arrays and the Free Store
CPP Methods using Pointers
CPP Pointers and const Modifier
CPP Advance Pointers
CPP Class Members as pointers
CPP Dangerous Pointers Handling
CPP Object References
CPP Create and Use References
CPP Methods using References
CPP References and const Modifier
CPP Dangerous Reference Handling
CPP Overloading
CPP Overloading Methods
CPP Overloading Constructors
CPP Overloading operators
CPP Inheritance
CPP Access Specifiers
CPP Constructor Calling Sequence
CPP Override and Hiding Methods
CPP Aggregation and Delegation
CPP Polymorphism
CPP Polymorphism and Virtual Methods
CPP Polymorphism and Constructors
CPP Virtuality and Casting Down
CPP Polymophism and Abstract Class
CPP Polymophism and Multiple Inheritance
CPP Other stuff
CPP Templates
CPP Errors and Exceptions
CPP Preprocessor commands
Review w3processing.com on alexa.com

CPP Constants

Working with Constants in C++

  1. A Literal Constant is a value typed directly into your program wherever it is needed.
    It is for example:
    int age = 39; // the number 39 cannot be changed
  2. A Symbolic Constant is a constant that is represented by a name, just as a variable is represented.
    For example:
    #define membersInEachGroup 12;
members = groups * membersInEachGroup;
    Alternative:
    const unsigned short int membersInEachGroup = 12;
members = groups * membersOnEachGroup;
    The last one is typed an in many cases better to use then the first symbolic constant.
  3. A Enumerated Constant enable you to create new types and then to define variables of those types whose values are restricted to a set of possible values.
    For example:
    Source code Result 
    #include <iostream>
int main() {
  enum Months { jan, feb, mars, april, may, june,
    july, aug, sep, oct, nov, dec  };

  Months thisMonth= april;

  if (thisMonth == dec ||
    thisMonth == jan ||
    thisMonth == feb)
    std::cout << "I is Winter season!\n";
  else  if (thisMonth == mars ||
    thisMonth == april ||
    thisMonth == may )
    std::cout << "I is Spring season!\n";
  else  if (thisMonth == june ||
    thisMonth == july ||
    thisMonth == aug )
    std::cout << "I is Summer season!\n";
  else
    std::cout << "I is Autumn season!\n";
  return 0;
}
    		 
    I is Spring season!

    You can download this example here (needed tools can be found in the right menu on this page).

Prev. in menu Next in menu
Prev. in menu Next in menu
© 2010 by Finnesand Data. All rights reserved.
This site aims to provide FREE programming training and technics.
Finnesand Data as site owner gives no warranty for the correctness in the pages or source codes.
The risk of using this web-site pages or any program codes from this website is entirely at the individual user.