isdigit()

Syntax:

#include <ctype.h>
int isdigit( int ch );



Description:
The function isdigit() returns non-zero if its argument is a digit between 0 and 9. Otherwise, zero is returned.

Example:

char c;
scanf( "%c", &c );
if( isdigit(c) )
  printf( "You entered the digit %c\n", c );



Related Topics:
isalnum(), isalpha(), iscntrl(), isgraph(), isprint(), ispunct(), isspace()

Nick Smith avatar

Nick Smith