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Functions | |
int | isalnum (int register __i0 c) |
int | isalpha (int register __i0 c) |
int | iscntrl (int register __i0 c) |
int | isdigit (int register __i0 c) |
int | isgraph (int register __i0 c) |
int | islower (int register __i0 c) |
int | isprint (int register __i0 c) |
int | ispunct (int register __i0 c) |
int | isspace (int register __i0 c) |
int | isupper (int register __i0 c) |
int | isxdigit (int register __i0 c) |
int register __i0 | tolower (int register __i0 c) |
int register __i0 | toupper (int register __i0 c) |
Definition in file ctype.h.
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return TRUE for alphanumerical. |
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return TRUE for alphabetic character. |
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return TRUE for control characters. |
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return TRUE for digits 0-9. |
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return TRUE for printable characters except space. |
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return TRUE for lowercase characters. |
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return TRUE for printable characters, including space. |
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return TRUE for printable characters that is not a space or alphanumeric. |
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return TRUE for white-space characters. |
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return TRUE for uppercase characters. |
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return TRUE for hexadecimal digits. |
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convert letter c to lower case if possible. |
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convert letter c to upper case if possible. |