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You will implement two programs in this project that are closely related. The first program is called
ALU. This program accepts three arguments from the command line. Two arguments are numbers
while one argument is one of the operations from ‘+’, ‘-‘, ‘/’,’x’. Your main function should read
these arguments, if the number of arguments is not 3, then your program should return the value -9999
and exit. If number of arguments is 3, then your program should perform the operation between the
two numbers and return the result of the operation.
2. The second program is called CPU. This program will take 1 argument from the command line which
will be a filename. Your program should open this file and read mathematical operations from each
line. Each line of the file will have one number followed by an operation and then a second number. A
sample file is given below.
3 + 6
12 – 4
3 x 10
4 24
3. For each line in the file, your program should fork a child process, in the child process execute the
program ALU and pass it the three values that you read from this line as arguments. Once all lines
have been executed, you will wait for the child ALU processes to finish execution and read the return
values sent by these processes. You will output the result of the operations in a file called math.txt in
the following format
3 + 6 = 9
Page 2 of 2
12 – 4 = 8
3 x 10 = 30
4 24 = not enough arguments
Keep in mind that an operation might produce a floating point exception. For example the
following is not possible mathematically
6 / 0
For operations like this, your program should report the following in the math.txt file
6 / 0 = illegal operation
You should NOT check for the numbers to be zero. You should get the exit status from the “wait”
call and check if the program terminated due to an exception.

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  1. Given the following main program

    #main
    a = [5,2,9,6,3] doubleList(a) print a

    Implement the function named doubleList that takes one list argument and modifies the list so that each element in the list is doubled. The statement print(a) in the main program will then have to print [10,4,18,12,6]

  2. Given the following main program

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    Implement the function named reversedList that takes one list argument and returns a list that contains the elements in the list argument in reverse order. The statement print(b) in the main program will then have to print [3,6,9,2,5]. The statement print(a) must print the original list [5,2,9,6,3] unaffected. This means your function should not modify the list argument.

  3. Given the following main program

    #main
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  4. What is the return value of the functions doubleList, reversedList and reverseList in questions 1, 2, and 3 above?

  1. Given the following main program

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  3. Part A
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    Part B

    Give the following main program

page2image58001280 page2image58001664

#main
A = [5,2,9,6,3]
B = [2,4,3,9,7,1,6,5]
flag = isList1InList2(A, B) if flag:

print "The list", A, "is contained in the list", B else:

print "The list", A, "is not contained in the list", B

Implement the function named isList1InList2 that takes two list arguments and returns True if and only if each element of the first list argument are found in the second list argument; otherwise it returns False.

Remark: You are NOT allowed to use the in operator or any other built in function when you write this function. Instead, if you wish, you can use the function you wrote in Part A.

For the lists shown in the main program, your function must return True because each element of list A is found in list B.

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    b = [5,2,9,6,3]

    print isList1InList2(a,b)

  3. Given your function in question #7 above, what is the output of the following code:

    a=[]
    b=[]
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print isList1InList2(a,b)

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  2. Write a function named createRandomList that takes an integer argument n and returns a list with n elements. The elements must be random numbers in the range [0,100]

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  • sumOfElementsAtOddIndexes: returns the sum of the elements at odd indexes. Use a for loop or a while loop.

  • sumOfAllElements_A: returns the sum of all the elements in the list using the functionssumOfElementsAtEvenIndexes and sumOfElementsAtOddIndexes. Here you are NOT allowed to use any loop; instead make function calls as described.

  • sumOfEvenElements: returns the sum of the even integer elements in the list. Use a for loop or a while loop.

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17. Most data compression algorithms like winzip, gzip, lzip and etc are based on the frequency distribution of characters in a given string. Write a function named getFreqDistribution that takes a string argument and returns a LIST that has length 26 such that the first element of the list is the number of appearance of 'a' or 'A' in the string, the second element is number of appearance of 'b' or 'B', and so on so forth.

I'm studying python 2 and have a lot of troubles with solving these homework questions.

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