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2013-10 2013-09 2013-08

C library function - isalnum()

September 6, 2013 Posted by: GPA Views: 726 0 comments

Problem

C library function - isalnum(). Write simple application using this function.

Solution

This function checks if the passed character is a digit or a letter. For using this function you must include <ctype.h> library.

Declaration:

int isalnum(int value); 

where value is the character to be checked. 

This function returns 1 (true), if input value is a digit or a letter and 0 (false) otherwise.

Example:

   


 
#include
<stdio.h>
#include <ctype.h>
int main(int argc, char *argv[])
{
     int value;
     printf("Enter some value: ");//promt user to enter some value
     scanf("%c",&value);//read from keyboard
     //call function isalnum and show result
   if(isalnum(value)) {
     printf("This value is alphanumeric\n");
   } else {
 printf("This value is not alphanumeric\n");
   }
system("PAUSE");
  return 0;
}

Output

c library function - isalnum

Download this example

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