isdigit

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isdigit

Syntax:

  #include <ctype.h>
  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 );