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my $var = "foo";
print 'Variable name is $var';   # prints: Variable name is $var
print "Variable is $var";         # prints: Variable is foo

my $var = 10;
print "There are $varapples";     # error: the compiler cannot know wh
+ere the variable name ends
...
print "There are ${var}apples";   # prints: there are 10apples. 
                                  # A space is missing, but the print 
+statement works, because the compiler can know 
                                  # where the variable name ends thank
+s to the curlies;