Constants:
Constants are of fixed values that do not change during the execution of a program. There are various types of constants. The types are illustrated in the following figure.
Integer constants:
An integer constant refers to a sequence of digits. There are three types of integer constants, namely, decimal integer, octal integer and hexadecimal integer.
Decimal integer consists of a set of digits from 0 to 9, preceded by an optional + or - sign.
Examples, 123 -321 0 64932
Ocial integer consists of a set of digits from 0 to 7, with a leading 0. Examples, 037 0 0437 0551
A sequence of digits preceded by 0x or 0X is considered as hexadecimal integer. They may also includes letters from A to F or from a to f. The letters represents the numbers from 10 to 15.
Examples, 0X2 0x9F 0Xbcd 0x
Real constants:
Real constants are used to represent quantities that are very continuously such as distances, temperature etc. These quantities are represented by numbers containing fractional parts. Examples, 0.00832 -0.75 33.337 Attachments area Single Character Constants:
A single character constants contains a single character enclosed within a pair of single quote marks. Example, '5'
'X'
';'
String Constants:
A string constants contains a string of characters enclosed within a pair of double quote marks. Example, "Hello"
"1987"
"?.....!"
Backslash character constants :
C supports some special backslash character constants that are used in output functions. For example
Constants are of fixed values that do not change during the execution of a program. There are various types of constants. The types are illustrated in the following figure.
Integer constants:
An integer constant refers to a sequence of digits. There are three types of integer constants, namely, decimal integer, octal integer and hexadecimal integer.
Decimal integer consists of a set of digits from 0 to 9, preceded by an optional + or - sign.
Examples, 123 -321 0 64932
Ocial integer consists of a set of digits from 0 to 7, with a leading 0. Examples, 037 0 0437 0551
A sequence of digits preceded by 0x or 0X is considered as hexadecimal integer. They may also includes letters from A to F or from a to f. The letters represents the numbers from 10 to 15.
Examples, 0X2 0x9F 0Xbcd 0x
Real constants:
Real constants are used to represent quantities that are very continuously such as distances, temperature etc. These quantities are represented by numbers containing fractional parts. Examples, 0.00832 -0.75 33.337 Attachments area Single Character Constants:
A single character constants contains a single character enclosed within a pair of single quote marks. Example, '5'
'X'
';'
String Constants:
A string constants contains a string of characters enclosed within a pair of double quote marks. Example, "Hello"
"1987"
"?.....!"
Backslash character constants :
C supports some special backslash character constants that are used in output functions. For example
Constants Meaning
'\a' audible alert (bell)
'\?' question mark
'\n' new line