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C - isalnum function

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Synopsis:

#include <stdio.h>

int isalnum(int c); 

Description:

The function returns nonzero if c is 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
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
o 1 2 3 4 5 6 7 8 9

Return Value

The function returns nonzero if c is alphanumeric otherwise this will return zero which will be equivalent to false.

Example

#include <stdio.h>

int main() {

  if( isalnum( ';' ) )
  {
     printf( "Character ; is not alphanumeric\n" );
  }
  if( isalnum( 'A' ) )
  {
     printf( "Character A is alphanumeric\n" );
  }
  return 0;
}

It will proiduce following result:

Character A is alphanumeric


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