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c:ctype.h:isalnum

Table of Contents

isalnum

    int isalnum(int chr);

check if a character Alphanumeric

C Sourcecode Example

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
#include <ctype.h>
 
int main ()
{
  int i;
  char string[11]="Test -!&%1";
  for (i=0; i <= 11;i++)
    {
     if ( isalnum(string[i]) != 0 )
      {
       printf("Character %i is alphanumeric\n",i);
      }
    }
  return 0;
}

output

  user@host:~$ ./isalnum 
  Character 0 is alphanumeric
  Character 1 is alphanumeric
  Character 2 is alphanumeric
  Character 3 is alphanumeric
  Character 9 is alphanumeric
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c/ctype.h/isalnum.txt · Last modified: 2013/01/22 22:02 (external edit)

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