#!/usr/bin/perl
use strict;
use warnings;
use diagnostics;
use feature 'say';
use feature "switch";

my $input = 0;
my $play_again = 0;
srand;

while ()
{
  my $random_integer1=int(rand(100));   #generate a random integer from 0 to 99
  my $random_integer2=int(rand(100));   #generate a random integer from 0 to 99

  if ($random_integer1 > $random_integer2){
    print "What is $random_integer1 - $random_integer2 = ";
    $input = <STDIN>;
    if ($input == $random_integer1 - $random_integer2){
      print "Well done.! you are corect.\n\n";
    }else{
      print "Sorry you're wrong, have another go.\n\n";
    }
  }else{
    print "What is $random_integer1 + $random_integer2 = ";
    $input = <STDIN>;
    if ($input == $random_integer1 + $random_integer2){
      print "Well done.! you are corect.\n\n";
    }else{
      print "Sorry you're wrong, have another go.\n\n";
    }
  }
}