Constant

In C programming language, a constant is a fixed value that cannot be changed during the execution of the program. Constants can be of different data types, such as integer, floating-point, character, or string. Here are some examples of different types of constants in C:

1 . Integer constants: These are used to represent integer values. Integer constants can be written in decimal (base 10), octal (base 8), or hexadecimal (base 16) format. For example

				
					int num = 10;           // decimal integer constant
int num2 = 012;         // octal integer constant (equivalent to decimal 10)
int num3 = 0xA;         // hexadecimal integer constant (equivalent to decimal 10)

Floating-point constants: These are used to represent real numbers with decimal places. Floating-point constants can be written in either decimal or exponential notation. For example:

				
					float pi = 3.14159;     // decimal floating-point constant
float num = 2.5e-3;     // exponential floating-point constant (equivalent to 0.0025)

Character constants: These are used to represent individual characters. Character constants are enclosed in single quotes. For example:

				
					char letter = 'a';      // character constant

String constants: These are used to represent a sequence of characters (i.e., a string). String constants are enclosed in double quotes. For example:

				
					char str[] = "Hello";   // string constant

Constants can be used in C programs to define fixed values that are used repeatedly throughout the program. By using constants, you can make your code more readable, maintainable, and flexible.

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Constant

Constant

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