Table of Contents

isalnum
- cpp Sourcecode Example
  - output

isalnum

    int isalnum(int chr);

check if a character Alphanumeric

cpp Sourcecode Example

#include <iostream> /* including standard library */
#include <string>
#include <cctype>
 
using namespace std;
int main ()
{
  int i;
  string str="Test -!&%1";
  for (i=0; i <= 11;i++)
    {
     if ( isalnum(str[i]) != 0 )
      {
       cout << "Character " << i << " is alphanumeric" << endl;
      }
    }
  return 0;
}

output

  Character 0 is alphanumeric
  Character 1 is alphanumeric
  Character 2 is alphanumeric
  Character 3 is alphanumeric
  Character 9 is alphanumeric