#!/usr/local/bin/perl -w

    print "Enter the first number : ";
    my $num1 = <STDIN>; chomp $num1;
    print "Enter the second number: ";
    my $num2 = <STDIN>; chomp $num2;
    print "Enter the third number : ";
    my $num3 = <STDIN>; chomp $num3;

    # A*B-C
    my $answer = $num1 * $num2 - $num3;
    print "$num1 * $num2 - $num3 = $answer \n";

    # (A*B)-C
    $answer = ($num1 * $num2) - $num3;
    print "($num1 * $num2) - $num3 = $answer \n";

    # A*(B-C)
    $answer = $num1 * ($num2 - $num3);
    print "$num1 * ($num2 - $num3) = $answer \n";