Digit Checker in C

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" ) ;

}