In this blog post, you will learn how to write a C program to trim leading and trailing white spaces from a string. How to remove both leading and trailing white space characters in a string using loop in C programming. Also, logic to delete all leading and trailing white space characters from a given […]

The isspace function in C programming checks whether the argument passed is a white-space character or not. The standard white-space characters are the following: space (‘ ‘ ), form feed (‘\f’ ), new-line (‘\n’ ), carriage return (‘\r’ ), horizontal tab (‘\t’ ), and vertical tab (‘\v’).   List of all standard white-space characters in C programming

The isupper function in C programming checks whether the argument passed is an uppercase letter or not. In the “C” locale uppercase letters are any of: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z. It is declared

The iscntrl function in C programming checks whether the argument passed is a control character or not. In the default, “C” locale, the control characters are the characters with the codes 0x00-0x1F and 0x7F. It is declared in ctype.h and takes one argument in the form of integer and returns the value of type int.

The isdigit function in C programming checks whether the argument passed is a decimal digit character or not. The decimal digits are any of:  0 1 2 3 4 5 6 7 8 9. It is declared in ctype.h  and takes one argument in the form of integer and returns the value of type int.

The isalpha function in C programming checks whether the argument passed is an alphabetic character (a to z and A-Z) or not. It is declared in ctype.h and takes one argument. The isalpha function tests for any character for which isupper or islower is true, or any character that is one of a locale-specific set

The isalnum function in C programming checks whether the argument passed is an alphanumeric character (alphabet or number) or not. It is declared in ctype.h and takes one argument. The isalnum function tests for any character for which isalpha or isdigit is true.   Syntax of isalnum function in C: //Syntax of isalnum int isalnum(int