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C - isdigit function

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Synopsis:

#include <stdio.h>

int isdigit(int c); 

Description:

The function returns nonzero if c is any of:

0 1 2 3 4 5 6 7 8 9

Return Value

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

Example

#include <stdio.h>

int main() {

  if( isdigit( '9' ) )
  {
     printf( "Character 9 is a digit\n" );
  }
  if( isdigit( 'A' ) )
  {
     printf( "Character A is digit\n" );
  }
  return 0;
}

It will proiduce following result:

Character 9 is a digit


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