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| 1 | isdigit() | atof() | getchar() | strcpy() | sqrt() |
| 2 | isalpha() | atoi() | gets() | strncpy() | exp() |
| 3 | isalnum() | atol() | putchar() | strcat() | log() |
| 4 | isxdigit() | strtod() | puts() | strncat() | log10() |
| 5 | islower() | strtol() | printf() | strcmp() | fabs() |
| 6 | isupper() | strtoul() | sprintf() | strncmp() | ceil() |
| 7 | tolower() | srand() | scanf() | strlen() | floor() |
| 8 | toupper() | rand() | sscanf() | strstr() | pow() |
| 9 | isspace() | fscanf() | strchr() | fmod() | |
| 10 | iscntrl() | fopen() | strtok() | sin() | |
| 11 | ispunct() | fclose() | strspn() | cos() | |
| 12 | isprint() | fseek() | strcspn() | tan() | |
| 13 | isgraph() | rewind() | strpbrk() | ||
| 14 | fread() | strerror() | |||
| 15 | fwrite() | memcpy() | |||
| 16 | sizeof() | memmove() | |||
| 17 | fgetc() | memcmp() | |||
| 18 | feof() | memchr() | |||
| 19 | fprintf() | memset() | |||
| <ctype.h> | <stdlib.h> | <stdio.h> | <string.h> | <math.h> | |
Other header files with built-in functions related to:
1. Error trapping and debugging:
<assert.h>, <signal.h>,
<errno.h>
2. system float and integral sizes and defs:
<float.h>, <limits.h>,
<stddef.h>
3. location and time formatting instructions:
<locale.h>, <time.h>;
4. variant function behavior:
<stdarg.h>, <setjmp.h>