Created
November 28, 2012 15:37
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| #!/usr/bin/perl | |
| use strict; | |
| #Because of the way that Perl does in the | |
| my %coins = ( "Quarter" , 25, | |
| "Dime" , 10, | |
| "Nickel", 5 ); | |
| #print out all the values | |
| print("Here are all the values in the hash\n"); | |
| while (my ($key, $value) = each(%coins)){ | |
| print("key = $key\n"); | |
| } | |
| #start a while loop that dies on the first iteration. This will cause th internal | |
| #marker that perl keeps to stay where it was when the loop died. | |
| eval{ | |
| while (my ($key, $value) = each(%coins)){ | |
| die("This will cause the next while loop to start where this one left off"); | |
| } | |
| } or do { | |
| print "$@\n"; | |
| }; | |
| print("All But first value, because last loop died: \n"); | |
| #because the first while died, this one will start with the 2nd key in the hash and | |
| #print out all but the first value. | |
| while (my ($key, $value) = each(%coins)){ | |
| print("key = $key\n"); | |
| } | |
| print("\nillustrate that nested while loops on the same hash are infintie.\n"); | |
| my $counter = 0; | |
| while (my ($key, $value) = each(%coins)){ | |
| if($counter > 10){ | |
| die("The counter reached 10 and never should because there is only 3 items in the hash"); | |
| } | |
| while (my ($key, $value) = each(%coins)){ | |
| print(" inner key = $key\n"); | |
| } | |
| print("outer key = $key\n"); | |
| $counter += 1; | |
| } | |
| 1; | |
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