C + + variable naming conventions

Variable naming rules are designed to enhance the readability and ease of maintenance of your code. The following are the variable naming conventions that C + + must follow:

1. variable names can only be letters (A-Z , A-Z ) and Numbers (0-9 ) or underline (_ ) composition.

2. The first letter must start with a letter or an underscore.

3. cannot use C + + keyword to name variables to avoid conflicts.

4. variable names are case-sensitive.

variable naming rules:

First, use the shortest character to represent the most accurate meaning.

Second, use a variable prefix.

1. Prefix of integer type

int nId;  int prefix: nshort sId;  Short prefix: sunsigned int unId  //unsigned int prefix: Unlong lId;  Long prefix: l

2. Floating-point prefix

float Fvalue;  Float prefix: fdouble dvalue;  Double prefix: D

3. Prefix of character type

char Chchar;  Char prefix: CH

4. String prefix

char szpath;  Char string prefix: szstring strpath;  String string prefix: strcstring strpath;  MFC CString class prefix: str

5. Boolean prefix

BOOL Bisok;  BOOL type prefix: Bbool bisok;  MFC BOOL Prefix: b

6. Pointer type prefix

char *   Ppath;  Pointer prefix: P

7. Array prefix

int arrnnum;  Array prefix: arrcstring arrstrname;  Array prefix + type prefix + Name

8. Structure Prefix

STUDENT Txiaozhang;  struct Prefix: t

9. Enumeration prefix

Enum Emweek;  Enumeration prefix: EM

10, byte prefix

BYTE Byip;  BYTE prefix: by

11, the prefix of the word

DWORD Dwmsgid;  Double word prefix: Dwword wmsgid;  Word prefix: w

12. Character pointer prefix

LPCTSTR Ptszname;  TCHAR type is ptszlpcstr pszname;  Pcszlpstr Pszname;  Psz

13. STL Container Prefix

Vector Vecvalue;  Vector container prefix: VEC

14. RECT Rectangle structure Prefix

RECT Rcchild;  Rccrect rcchild/  //RC

15. Handle Prefix

HWND Hwnddlg;  Hhbrush HBr;  Hhpen Hpen;  Hhbitmap Hbmpback;  H

16. Windows Color Prefix

COLORREF Crfont;  Cr

17. Windows DC Prefix

CDC dcclient;  dc

Third, the member variables of the M_ class are at the beginning, followed by a variable, the variable is also prefixed.

CString M_strname;  M_ start + type prefix + Name

Four, defines a variable that, in order to simplify, can use only prefixes without affecting the meaning of the variable.

RECT RC;

Five, The global variables are all g_ at the beginning, followed by a variable, the variable is also prefixed.

int g_id;  G

Six, define the structure to ensure C and C + + compatible, with typedef statement, and the struct type is all uppercase to T_ starting with the pointer form to Pt_ start.

typedef struct TAG Tstudent{int   nId; CString  StrName;} Student,*pstudent; STUDENT   Txiaozhang;  Complete definition of struct body

Seven, A variable is made up of multiple words, and the first letter of each word is capitalized.

int Nstudentid; CString Strstudentname;

Eight, define a class with a C or T as the class name prefix.

Class Cmylistctrl;class Tmylistctrl;

Nine, MFC Control-bound value category or control class category, you need to m_ begins and prefixes.

CEdit M_edt_strvalue;  Edit Bound control category CListBox M_lb_nname;  Listboxclistctrl M_lc_name;  Listctrl; CComboBox M_cb_name;  /combobox

10. Control ID simplify and indicate the type and meaning of the control as much as possible.

Button   Idc_bnt_name; Edit  Idc_edt_name; ListBox  Idc_lb_name; Listctrl  Idc_lc_name; ComboBox  Idc_cb_name;

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C + + variable naming conventions