C Tutorial ctype.h
Standard Library Functions
stdio.h
ctype.h

string.h
stdlib.h
 

 

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ctype.h includes macros for doing simple tests and operations on characters

 

isalpha(ch)      // ch is an upper or lower case letter

 

islower(ch), isupper(ch)  // same as above, but upper/lower specific isspace(ch)                 // ch is a whitepace character such as tab, space, newline, etc. isdigit(ch)      // digit such as '0'..'9'

toupper(ch), tolower(ch)  // Return the lower or upper case version of a alphabetic character, otherwise pass it through unchanged.

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