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  1. or download this
    #!/usr/bin/perl
use strict;
while ( my $number != 10 ) {
        printf("Please, the number 10: ");
        $number = <STDIN>;
}
  2. or download this
    #!/usr/bin/perl
use strict;
...
        printf("Please, the number 10: ");
        $number = <STDIN>;
}
  3. or download this
    #!/usr/bin/perl
use strict;
...
        printf("Please, the number 10: ");
        $number = <STDIN>;
}