The iscntrl() function returns a non-zero if its argument is a control character. If there is no control character encountered, then zero is returned.
iscntrl() source code example:
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Posted in C Reference ctype.h Functions |
The function isalpha() returns a non-zero if its argument is a letter of the alphabet. If it is not a letter of the alphabet, then zero is returned.
isalpha() source code example:
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Posted in C Reference ctype.h Functions |
The function isalnum() returns a non-zero if its argument is a letter of the alphabet or a numeric digit. If it is not letter of the alphabet or a numeric digit, then zero is returned.
isalnum() source code example:
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Posted in C Reference ctype.h Functions |