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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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