C LANGUAGE: STANDARD LIBRARY FUNCTIONS - CTYPE.H
CHARACTER TESTING FUNCTIONS
| isalnum() | Test for Alphanumeric |
| isalpha() | Test for Alphabetic |
| iscntrl() | Test for Control Character |
| isdigit() | Test for Digit |
| isgraph() | Test for Graphical Character (does not include a space) |
| islower() | Test for Lowercase Letter |
| isprint() | Test for Printing Character (does include a space) |
| ispunct() | Test for Punctuation Character |
| isspace() | Test for White-Space Character |
| isupper() | Test for Uppercase Letter |
| isxdigit() | Test for Hexadecimal Digit |
CHARACTER CASE-MAPPING FUNCTIONS
| tolower() | Convert to Lowercase |
| toupper() | Convert to Uppercase |
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