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Network programming tutorial

C language srand() function: initialize the random number generator

C language srand() function: Initialize the generator of random numbers Function name: srand header file: <stdlib.h> Function prototype: voidsrand(unsignedseed); Function: Used to initialize the generator of random numbers Parameters: unsign

2024-11-16
C language rand() function: used to generate random numbers

C language rand() function: used to generate random numbers Function name: rand header file: <stdlib.h> Function prototype: intrand(void); Function: used to generate random numbers Parameters: No parameters Return value: Return the generated

2024-11-16
C language qsort() function: used to quickly sort records from small to large

C language qsort() function: used to quickly sort records from small to large Function name: qsort header file: <stdlib.h> Function prototype: void*qsort(void*district,size_tn,size_tm, &nb……

2024-11-16
C language putenv() function: used to change or add the contents of environment variables

C language putenv() function: used to change or add the content of environment variables Function name: putenv header file: <stdlib.h> Function prototype: void*putenv(char*name); Function: used to change or add environment variables Content

2024-11-16
C language malloc() function: used to allocate heap memory of a specified size

C language malloc() function: used to allocate heap memory of a specified size Function name: malloc header file: <stdlib.h> Function prototype: void*malloc(unsignedsize); Function: used to allocate a heap memory of a specified size Paramete

2024-11-16
C language realloc() function: used to reallocate the heap memory space of a specified size

C language realloc() function: used to reallocate heap memory space of a specified size Function name: realloc Header file: <stdlib.h> Function prototype: void*realloc(void*p,unsignedsize); Function: used to reallocate Specify the size of th

2024-11-16
strtod(): Convert string to floating point number

strtod(): Convert a string to a floating point number Function name: strtod header file: <stdlib.h> Function prototype: doublestrtod(char*s,char**ptr); Function: Used to convert a string to a floating point number Parameters: char*s&a……

2024-11-16
C language strtod() function: convert string to floating point number

C language strtod() function: Convert a string to a floating point number Function name: strtod header file: <stdlib.h> Function prototype: doublestrtod(char*s,char**ptr); Function: Used to convert a string For floating point parameters: cha

2024-11-16
C language strtol() function: convert string into long integer

C language strtol() function: convert a string into a long integer Function name: strtol header file: <stdlib.h> Function prototype: longstrtol(char*s,char**ptr,inradix); Function: used to convert Convert string to long integer parameter: c.

2024-11-16
C language swap() function: swap bytes from source and destination areas

C language swab() function: exchange bytes from source and target areas Function name: swab header file: <stdlib.h> Function prototype: voidswab(char*from,char*to,intn); Function: From source and target Area exchange byte parameters: char*fr

2024-11-16
C language system() function: Issue a DOS command

C language system() function: issue a DOS command Function name: system header file: <stdlib.h> Function prototype: intsystem(char*command); Function: used to issue a DOS command Parameters: char*command&……

2024-11-16
C language strcmp() function: compare the size of two strings

C language strcmp() function: Compare the size of two strings Function name: strcmp Header file:<string.h>Function prototype: intstrcmp(constchar*str1,constchar*st……

2024-11-16
C language raise() function: sends a signal to the executing program

C language raise() function: Send a signal to the executing program Function name: raise Header file: <stdio.h> Function prototype: intraise(intsig); Function: Send a signal to the executing program Parameters: To send Signal name return val

2024-11-16
C language strcpy() function: copies a string to another string array

C language strcpy() function: copy a string to another string array Function name: strcpy Header file:<string.h>Function prototype: char*strcpy(char*destin,constchar*sou… …

2024-11-16
C language strcat() function: concatenate a string after the target string

C language strcat() function: Splice a string after the target string Function name:   strcat header file: <string.h> Function:   Splice a string after the target string Function prototype : char*st……

2024-11-16

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