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ctype.h Christine S. Wolfe Ohio University Lancaster 2008-Aug-01 This lesson introduces the library functions included in ctype.h: Vocabulary: ctype.h isalnum() isalpha() iscntrl() isdigit() isgraph() islower() isprint() ispunct() isspace() isupper() isxdigit() tolower() toupper()

C Primer Plus®, Third Edition by Stephen Prata. Publisher: Sams Pub Date: September 28, 1998 Print ISBN-10: Table 7.1. ctype.h character-testing functions. NameTrue If Argument Is isalnum()Alphanumeric (alphabetic or numeric) isalpha()Alphabetic iscntrl()A control character, such as Ctrl+B isdigit()A digit isgraph()Any printing character other than a space islower()A lowercase character isprint()A printing character ispunct()A punctuation character (any printing character other than a space or an alphanumeric character) isspace()A whitespace character: space, newline, formfeed, carriage return, vertical tab, horizontal tab, or, possibly, other implementation-defined characters isupper()An uppercase character isxdigit()A hexadecimal-digit character Table 7.2. ctype.h character-mapping functions. NameAction tolower()If the argument is an uppercase character, returns the lowercase version; otherwise, just returns the original argument toupper()If the argument is a lowercase character, returns the uppercase version; otherwise, just returns the original argument The ctype.h header file includes several useful functions. The argument for these functions is a single char.

Before these functions can be used in a program, the ctype.h library must be included. #include int main() { char Response; printf("Please enter your selection: "); fflush(stdin); scanf("\n%c", &Response); if ( toupper(Response) == 'Q') { return 0; } }

isalnum() isalpha() iscntrl() isdigit() isgraph() islower() isprint() ispunct() isspace() isupper() isxdigit() The ctype functions that begin with "is" are boolean. That means they return either TRUE or FALSE, the logical values.

Given that the user entered 'A' as Response, what is the value of each of these expressions? isalnum(Response) isalpha(Response) iscntrl(Response) isdigit(Response) isgraph(Response) islower(Response) isprint(Response) ispunct(Response) isspace(Response) isupper(Response) isxdigit(Response) Click for answer True False True False True False True Click for answer

Given that the user entered '6' as Response, what is the value of each of these expressions? isalnum(Response) isalpha(Response) iscntrl(Response) isdigit(Response) isgraph(Response) islower(Response) isprint(Response) ispunct(Response) isspace(Response) isupper(Response) isxdigit(Response) Click for answer True False True False True False True Click for answer

tolower() toupper() The ctype functions that begin with "to" return a char value. They do NOT change the value of the argument itself. For example: Letter1 = toupper(Letter2); BEFOREAFTER Letter1Letter2Letter1Letter2 hHh GGG 666 ;;;

The argument for the ctype.h library functions MUST BE A char!!! Given the declarations below, the following statements are syntactically incorrect: int NumIn = 345; char Name[20] = "hal"; char Proper[20]; if (isDigit(NumIn)) Proper = toupper(Name); Please don't look at this slide for too long - I don't to plant these ideas in your head if they weren't already there!!!