C++ Programming/Code/Standard C Library/Functions/isdigit

isdigit

Syntax

#include <cctype> int isdigit( int ch );

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

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 - isxdigit