C Constants are like a variable, except their value never changes during execution once defined. This tutorial describes C Constants.
C Constant is the most fundamental and essential part of the C programming language. Constants in C are the fixed values used in a program, and their value remains the same during the entire program execution.
Constants are also called literals.
Constants can be any of the data types.
It is considered best practice to define constants using only upper-case names
Syntax:
const type constant_name;
const
keyword defines a constant in C.
Example:
#include<stdio.h>
void main()
{
const int SIDE = 10;
int area;
area = SIDE*SIDE;
printf("The area of the square with side: %d is: %d sq. units", SIDE, area);
}
Program Output:
Putting const either before or after the type is possible.
int const SIDE = 10;
or
const int SIDE = 10;
Constants are categorized into two basic types, each of which has subtypes/categories. These are:
It refers to a sequence of digits. Integers are of three types viz:
Example:
15, -265, 0, 99818, +25, 045, 0X6
The numbers containing fractional parts like 99.25 are called real or floating points constant.
It simply contains a single character enclosed within ' and ' (a pair of the single quote). It is to be noted that the character '8' is not the same as 8. Character constants have specific integer values known as ASCII (American Standard Code for Information Interchange).
Example:
'X', '5', ';'
These are a sequence of characters enclosed in double quotes, and they may include letters, digits, special characters, and blank spaces. Note that "G" and 'G' are different - because "G" represents a string as it is enclosed within a pair of double quotes, whereas 'G' means a single character.
Example:
"Hello!", "2015", "2+1"
C supports some character constants having a backslash in front of it. The lists of backslash characters have a specific meaning known to the compiler. They are also termed "Escape Sequences".
Example:
\t
is used to give a tab \n
is used to give a new line
Contstants | MEANING |
---|---|
\a | beep sound |
\b | backspace |
\f | form feed |
\n | new line |
\r | carriage return |
\t | horizontal tab |
\v | vertical tab |
\' | single quote |
\" | double quote |
\\ | backslash |
\0 | null |
The DevOps seminar will help you to learn DevOps from scracth to deep knowledge of various DevOps tools such as fallowing List.
  Kubernetes.