Why are keys important?
What will be an ideal response?
A key uniquely identifies an entity and is minimal. The first is so that one can talk
about an entity and others know which one exactly he is talking about. The second is for
convenience and efficiency of identifying an entity.
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Find the error(s) and show how to correct it (them) in each of the following.
a) File payables.txt referred to by ofstream object outPayable has not been opened. outPayable << account << company << amount << endl; b) The following statement should read a record from the file payables.txt. The if-stream object inPayable refers to this file, and istream object inReceivable refers to the file receivables.txt. inReceivable >> account >> company >> amount; c) The file tools.txt should be opened to add data to the file without discarding the current data. ofstream outTools( "tools.txt", ios::out );
Create suitable names for Boolean variables to be used as flags. The variables will be true for each of the following situations and false otherwise. State names in a positive way and avoid including the terms not or no as part of the name.
When there are no more data items available for processing
________ fields can use any aggregate function
Fill in the blank(s) with correct word
An AVL tree is a search tree in which the heights of the subtrees differ by no more than ____.
A. 0 B. 1 C. 2 D. 3