c language constant definition rules

C language constant definition rules

Definition of constants: A constant refers to a quantity whose value cannot be changed while the program is running.

Constants in C language can be divided into direct constants and symbolic constants.

Direct constants refer to a form expressed directly with specific data. Direct constants are divided into integer constants, real constants, character constants and string constants;

Symbolic constants are Refers to a constant defined using a C language identifier.

Integer constants are integer constants, including decimal numbers, octal numbers and hexadecimal numbers. For example: 10, 012, 0x0A

Real type constants are also called floating point constants. For example: 3.14, 1.2E-4

Character constants must be enclosed in single quotes. For example: 'M', '\n'

String constants should be enclosed in double quotes. For example: "abc", "a"

Symbolic constants can be represented by macro definitions or by the const keyword. For example: #define PI 3.14 const float PI = 3.14

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