Constant in C++

•  Constants are also like normal variables. But, only difference is, their values can not be modified by the program once they are defined.

• Constants refer to fixed values. They are also called as literals

• Constants may be belonging to any of the data type.

• Or

• Constants are values that are hard-coded into a program, and which do not chnage value. E.g. "3.14159".

•  

1. Integer constants

1. Real or Floating point constants

1. Octal & Hexadecimal constants

1. Character constants

1. String constants

1. Backslash character constants

S.no	Constant type	data type	Example
1	Integer constants	int unsigned int long int long long int	53, 762, -478 etc 5000u, 1000U etc 483,647 2,147,483,680
2	Real or Floating point constants	float doule	10.456789 600.123456789
3	Octal constant	int	013          /* starts with 0  */
4	Hexadecimal constant	int	0×90        /* starts with 0x */
5	character constants	char	‘A’   ,   ‘B’,     ‘C’
6	string constants	char	“ABCD”   ,   “Hai”