Programming in C Theory and Lab EST 102 for KTU 2019 Scheme- Dr Binu V P

Character Processing (<ctype.h>) The <ctype.h> header file declares several functions for testing characters. For each function, the argument is an int whose value must be EOF or representable as an unsigned char , and the return value is an integer.   Functions   int isalnum(int c); Returns a nonzero integer if the character passed to it is an alphanumeric ASCII character. Otherwise, isalnum returns 0.   int isalpha(int c); Returns a nonzero integer if the character passed to it is an alphabetic ASCII character. Otherwise, isalpha returns 0.   int iscntrl(int c); Returns a nonzero integer if the character passed to it is an ASCII DEL character (177 octal, 0x7F hex) or any nonprinting ASCII character (a code less than 40 octal, 0x20 hex). Otherwise, iscntrl returns 0.   int isdigit(int c); Returns a nonzero integer if the character passed to it is a decimal digit character (0 to 9). Otherwise, isdigit returns 0.   int isgraph(int c); Returns a nonzero integer