Thread: isdigit()

When I run this program:

Code:

#include <stdio.h>
#include <ctype.h>

int main(void)
{
  int c = 0;
  printf("Enter a digit between 0 - 9\n");
  fflush(stdout);
  c = getchar();
  printf("The value from isdigit: %d\n", isdigit(c));
  return 0;
}

I expect the output to be 'The value from isdigit: 0' for any non digit, and 'The value of isdigit: 1' for any digit. When it is a non digit entry I get 0 as I expected, but for a digit entry, I get 2048. Why is this so?

The values returned are nonzero if the character c falls
into the tested class, and a zero value if not.

Ah, I thought this was the case, but I wanted to be sure. Thanks Thantos

~/

you don't need the fflush(stdout); because you have the \n in the printf string, which automatically flushes the buffer right?(C Gurus correct me if I am wrong)