When writing a program, it is often necessary to store data in memory in order to use the data or modify the value of the data. We usually use variables to store data, and using variables can reference the data stored in memory and process the data at any time as needed.
The concept of variables
In programming, the amount that allows its value to be changed is called a variable. A variable should have a name and occupy a certain storage location in memory. The variable name is represented by an identifier, which is actually a symbolic memory address. When the program is compiled and connected, the system assigns a symbolic address to each variable to save the value of the variable.
C language variable naming:
(1) i (commonly used n), int, integer, iSize
(2) n (commonly used s or sh), short, short integer type, nPort
(3) l, long, long integer type, lSum
(4) f, float, floating point type, fValue
(5) d, double, double precision floating point type, dValue
(6) u, unsigned
(7) ch (commonly used c), character type, chChar
(8) by, byte (unsigned character), byData
(9) b, Boolean, bIsTrue
(10) a (commonly used arr), Array, anNum[10]
(11) p, pointer, pFile
(12) fn, function, fnCallback
(13) sz, character ending with 0 String, szFileName
(14) s, string, sFileName
(15) g_, global variable, g_pFileLog
(16) s_, static variable, s_iCount
(17) e_, enumeration,
(18) t_, structure,
(19) u_, union,
(20) em , enumeration variable
(21) st (commonly used t), structure variable
(22) un, union variable
(23) _e, enumeration definition
(24)_t, structure definition
(25)_u, union definition
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