A simple program in C to check if the given character by the user is a digit or not.
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Program Listing
digit.c
#define ISDIGIT(y) ( y >= 48 && y <= 57 )
main( )
{
char ch ;
printf ( "Enter any digit " ) ;
scanf ( "%c", &ch ) ;
if ( ISDIGIT ( ch ) )
printf ( "\nYou entered a digit" ) ;
else
printf ( "\nIllegal input" ) ;
}
