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Network programming tutorial

C language islower() function: determine whether a character is a lowercase English letter

C language islower() function: Determine whether the character is a lowercase English letter Function name: islower header file: <ctype.h> Function prototype:  intislower(intch); Function:  Determine whether the character i

2024-11-13
C language isprint() function: determine whether a character is a printable character (including spaces)

C language isprint() function: Determine whether a character is a printable character (including spaces) Function name: isprint Header file: <ctype.h> Function prototype:  intisprint(intch); Function:   Determine whether a

2024-11-13
C language ispunct() function: determine whether a character is a punctuation mark

C language ispunct() function: Determine whether a character is a punctuation mark Function name: ispunct header file: <ctype.h> Function prototype:  intispunct(intch); Function:   Determine whether a character is a punctua

2024-11-13
C language isspace() function: determine whether a character is a blank character

C language isspace() function: Determine whether a character is a blank character Function name: isspace header file: <ctype.h> Function prototype:  intisspace(intch); Function:   Determine whether a character is a blank ch

2024-11-13
C language isupper() function: determine whether a character is an uppercase English letter

C language isupper() function: Determine whether the character is an uppercase English letter. Function name: isupper Header file: <ctype.h> Function prototype:  intisupper(intch); Function:  Determine whether the character

2024-11-13
C language toascii() function: Convert a character to ASCII

C language toascii() function: Convert a character to ASCII Function name: toascii header file: <ctype.h> Function prototype:  inttoascii(intch); Function: Convert a character to ASCII, which is actually eight bits Binary is the mos

2024-11-13
C language toupper() function: convert lowercase letters to uppercase letters

C language toupper() function: Convert lowercase letters to uppercase letters Function name: toupper Header file: <ctype.h> Function prototype:  inttouppper(intch); Function: Convert lowercase letters to uppercase letters, not lower

2024-11-13
C language_clear87() function: Get and clear the status word

C language _clear87() function: Get and clear the status word Function name: _clear87 Header file: <float.h> Function prototype:  unsignedint_clear87(void); Function: Get and clear the status word Parameters: No parameters are retur

2024-11-13
C language_control87() function: Get and set floating point control words

C language _control87() function: Get and set floating-point control words Function name: _control87 Header file: <float.h> Function prototype:  unsignedint_control87(unsignedintnew,unsigne...

2024-11-13
C language_status87() function: obtain floating point processor status value

C language _status87() function: Get the floating-point processor status value Function name: _status87 Header file: <float.h> Function prototype:  unsignedint_status87(void); Function: Get the floating-point processor status value

2024-11-13
C language access() function: determine file access permissions

C language access() function: Determine the access permission of the file Function name: access header file: <io.h> Function prototype: intaccess(constchar*file,intauth); Function: Determine the access permission of the file Parameters: cons

2024-11-13
C language chmod() function: used to change the file access method

C language chmod() function: used to change the file access method Function name: chmod header file: <io.h> Function prototype: intchmod(constchar*file,intauth); Function: used to change the file access method Parameters: constchar* fil…

2024-11-13
C language close() function: used to close the file opened by the open() function

C language close() function: used to close the file opened by the open() function Function name: close header file: <io.h> Function prototype: intclose(inthandle); Function: used to close the file opened by the open() function Opened file pa

2024-11-13
C language open() function: open a file

C language open() function: open a file Function name: open header file: <io.h> Function prototype: intopen(char*path,intaccess[,intauth]); Function: open a file Parameters: char*path Open……

2024-11-13
C language creat() function: Create a file with the specified file name

C language creat() function: Create a file with the specified file name. Function name: creat header file: <io.h> Function prototype: intcreat(constchar*file,intauth); Function: Create a file with the specified file name. Parameters: char* f

2024-11-13

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