By 25/02/2014 5 Comments

Constants in C++

Constants are expressions with a fixed value.

Defined constants (#define)

You can define your own names for constants that you use very often without having to resort to memory- consuming variables, simply by using the #define preprocessor directive. Its format is:

#define identifier value

Code Snippet

#include <iostream>
using namespace std;

#define PI 3.14159
#define NEWLINE '\n'

void main ()
double radius=5.0;	// radius
double circle;

circle = 2 * PI * radius;
cout << circle;  cout << NEWLINE;


Declared constants (const)

With the const prefix you can declare constants with a specific type in the same way as you would do with a variable. Here is the Code Snippet for it.

const int width = 1000;
const char tabulator = '\t';

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