For this exercise you are to implement a virtually initialized array and test it for correctness.
As usual, your program will prompt for the name of an input file and the read and process the data contained in this file.
You will use three integer arrays, data[], forward[] and backward[] each containing 100 elements.
Your test data will consist of a file containing two parts:
1. A sequence of pairs: what, where. You are to store the value what in location where of the data array using virtual initialization. I.e. data[where] = what.
2. This sequence is terminated by the pair ‐1 ‐1
3. This is followed by a sequence of single integer values, probe. For each such value you are to test whether data[probe] has been initialized and print one of the following two messages: Position probe has not been initialized.
Position probe has been initialized to value data[probe].
4. This sequence is terminated by the value ‐1
A sample input file might contain:
42 7
93 9
11 4
‐1 ‐1
7
8
9
‐1
For which the output would be:
Position 7 has been initialized to value 42.
Position 8 has not been initialized.
Position 9 has been initialized to value 93.
As usual, do not use classes or STL.
Submit your program source as ex3.ext via moodle where ext is on of c, cpp, java or py.
When you are finished, test your program using the provided text file named “Ex3.txt” and show your code and the output to your lab tutor to receive your mark. Also, submit your file via unix (banshee) using the submit command below.
$ submit -u login -c CSCI203 –a ex3 filename
where ‘login' is your UNIX login ID and ‘filename’ is the name of your file.
