C Language Function Manual learning

Directory

1. Character test function

2. String manipulation functions

3. Memory management function

4. Date and Time function

5. Mathematical Functions

6. File Operation function

7. Process management functions

8. File Permission control function

9. Signal Processing function

10. Interface Processing function

11. Environment variable function

12. Terminal Control function

Summary: This happened to find the C language function manual, see his classification is very clear, it took a few hours to learn, specific functions can be clicked on the link to view, or find manuals, commonly used functions are I know have encountered the function, or used function.

1. Character test function

1.1 isxdigit () 1.2 isupper () 1.3 ispunct () 1.4 isspace () 1.5 isprint () 1.6 islower ()

1.7 isgraphis () 1.8 isdigit () 1.9 Iscntrl () 1.10 isascii () 1.11 isalpha () 1.12 isalnum ()

Common functions: Isupper () \isacii () \islower () \isalpha ()

2. String manipulation functions

2.1 strtok () 2.2 strstr () 2.3 strspn () 2.4 strrchr () 2.5 strpbrk () 2.6 strncpy ()

2.7 strncat () 2.8 strncasecmp () 2.9 strlen () 2.10 strdup () 2.11 STRCHR () 2.12 strcspn ()

2.13 strcpy () 2.14 strcoll () 2.15 strcmp () 2.16 strcat () 2.17 strcasecmp () 2.18 Rindex ()

2.19 Index () 2.20 toupper () 2.21 tolower () 2.22 toascii () 2.23 strtoul () 2.24 strtol ()

2.25 strtod () 2.26 gcvt () 2.27 atol () 2.28 atoi () 2.29 atof ()

Common functions: strcpy () \strncpy () \strcat () \strncat () \strlen () \STRCHR () \strcmp ()

ToUpper () \tolower ()

Atol () \atoi () \atof ()

3. Memory management function

3.1 memset () 3.2 memmove () 3.3 memcpy () 3.4 memcmp () 3.5 memchr () 3.6 memccpy ()

3.7 bzero () 3.8 bcopy () 3.9 bcmp () 3.10 munmap () 3.11 mmap () 3.12 malloc ()

3.13 getpagesize () 3.14 free () 3.15 calloc ()

Common functions: Memset () \memcpy () \memcmp () \bzero () \malloc () \calloc () \free ()

4. Date and Time functions

4.1 Time () 4.2 settimeofday () 4.3 mktime () 4.4 localtime ()

4.5 gmtime () 4.6 gettimeofday () 4.7 ctime () 4.8 asctime ()

Common functions: Time () \localtime () \gmtime () \asctime ()

5. Mathematical Functions

5.1 Tanh () 5.2 tan () 5.3 sqrt () 5.4 sinh () 5.5 sin () 5.6 pow ()

5.7 log10 () 5.8 log () 5.9 ldexp () 5.10 frexp () 5.11 exp () 5.12 cosh ()

5.13 cos () 5.14 ceil () 5.15 atan2 () 5.16 Atan () 5.17 ASIN () 5.18 ACOs () 5.19 ABS ()

Common functions: sqrt () \pow () \log () \exp () \abs ()

6. File Operation function

6.1 ungetc () 6.2 endgrent () 6.3 endpwent () 6.4 endutent () 6.5 fgetgrent () 6.6 fgetpwent ()

6.7 Getegid () 6.8 geteuid () 6.9 getgid () 6.10 getgrent () 6.11 Getgrgid () 6.12 Getgrnam ()

6.13 getgroups () 6.14 GETPW () 6.15 getpwent () 6.16 Getpwnam () 6.17 getpwuid () 6.18 Getuid ()

6.19 getutent () 6.20 getutid () 6.21 getutline () 6.22 initgroups () 6.23 pututline () 6.24 Seteuid ()

6.25 Setfsgid () 6.26 setfsuid () 6.27 setgid () 6.28 setgrent () 6.29 setgroups () 6.30 setpwent ()

6.31 setregid () 6.32 setreuid () 6.33 setuid () 6.34 setutent () 6.35 utmpname () 6.36 Close ()

6.37 creat () 6.38 dup () 6.39 dup2 () 6.40 fcntl () 6.41 flock () 6.42 Fsync ()

6.43 Lseek () 6.44 mkstemp () 6.45 open () 6.46 read () 6.47 sync () 6.48 write ()

6.49 Clearerr () 6.50 fclose () 6.51 fdopen () 6.52 feof () 6.53 fflush () 6.54 fgetc ()

6.55 fgets () 6.56 Fileno () 6.57 fopen () 6.58 FPUTC () 6.59 fputs () 6.60 fread () 6.61 freopen ()

6.62 fseek () 6.63 ftell () 6.64 fwrite () 6.65 getc () 6.66 getchar () 6.67 gets () 6.68 mktemp ()

6.69 putc () 6.70 putchar () 6.71 rewind () 6.72 setbuf () 6.73 setbuffer () 6.74 setlinebuf () 6.75 setvbuf ()

Common functions: Getgid () \getuid () \setgid () \setuid ()

Fcntl () \open () \close () \read () \write () \fseek ()

Gets () \puts () \getchar () \getchar ()

fopen () \fclose () \fputs () \fgets ()

7. Process management functions

7.1 atexit () 7.2 execl () 7.3 execlp () 7.4 execv () 7.5 execve () 7.6 execvp ()

7.7 exit () 7.8 vfork () 7.9 _exit () 7.10 getpgid () 7.11 getpgrp () 7.12 Getpid ()

7.13 Getppid () 7.14 getpriority () 7.15 Nice () 7.16 on_exit () 7.17 Setpgid ()

7.18 setpgrp () 7.19 setpriority () 7.20 system () 7.21 Wait () 7.22 waitpid ()

7.23 fprintf () 7.24 fscanf () 7.25 printf () 7.26 sacnf () 7.27 sprintf () 7.28 sscanf ()

7.29 vfprintf () 7.30 vfscanf () 7.31 vprintf () 7.32 vscanf () 7.33 vsprintf () 7.34 vsscanf ()

Common functions: Exit () \getpid () \getppid () \waipid () \setpid () \wait ()

fprintf () \FSANCF () \printf () \sacanf () \sprintf () \sacnaf ()

　　　　　　

8. File Permission control function

8.1 Access () 8.2 alphasort () 8.3 chdir () 8.4 chmod () 8.5 chown () 8.6 chroot ()

8.7 closedir () 8.8 fchdir () 8.9 fchmod () 8.10 fchmod () 8.11 Fchown () 8.12 Fstat ()

8.13 ftruncate () 8.14 getcwd () 8.15 link () 8.16 lstat () 8.17 opendir () 8.18 Readdir ()

8.19 Readlink () 8.20 remove () 8.21 rename () 8.22 rewinddir () 8.23 seekdir () 8.24 stat ()

8.25 symlink () 8.26 telldir () 8.27 truncate () 8.28 umask () 8.29 unlink () 8.30 utime () 8.31 utimes ()

Common functions: ChDir () \chmod () \closedir () \opendir () \readdir () \seekdir ()

9. Signal Processing function

9.1 Alarm () 9.2 kill () 9.3 sigaction () 9.4 pause () 9.5 sigaddset () 9.6 sigdelset ()

9.7 sigemptyset () 9.8 sigfillset () 9.9 sigismember () 9.10 signal () 9.11 sigpending ()

9.12 Sigprocmask () 9.13 sleep () 9.14 ferror () 9.15 perror () 9.16 strerror ()

9.17 Mkfifo () 9.18 pclose () 9.19 Popen ()

Common functions: Kill () \pause () \sleep () \perror () \strerror ()

10. Interface Processing function

10.1 Accept () 10.2 bind () 10.3 Connect () 10.4 endprotoent () 10.5 endservent () 1

0.6 getsockopt () 10.7 getsockopt () 10.8 htonl () 10.9 htons () 10.10 inet_addr ()

10.11 Inet_aton () 10.12 Inet_ntoa () 10.13 Listen () 10.14 Ntohl () 10.15 Ntohs ()

10.16 recv () 10.17 recvfrom () 10.18 recvmsg () 10.19 send () 10.20 sendmsg ()

10.21 sendto () 10.22 setservent () 10.23 setprotoent () 10.24 setsockopt () 10.25 shutdown () 10.26 socket ()

11. Environment variable function

11.1 getenv () 11.2 putenv ()

12. Terminal Control function

12.1 getopt () 12.2 isatty () 12.3 Select () 12.4 ttyname ()

C Language Function Manual learning