Hello,<br /><br />I should define a data structure for environments. i.e., a map from strings to boolean values and among the operations on the data structure there should be a way to <br />_create an empty environment, <br />_add a variable and give it a value<br /><br />I really did not understand how to create an environment.<br />If someone has any idea plz help?<br /><br />what is an empty environment mean? <br /><br />Thanks for your all help<br /><br /><br />Sedef
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