CSCI 110

Given the function definition:
	def Mystery( someVal):
		answer = 0
		if  someVal > 2.0:
			answer =  3.0 * someVal
		else:
			answer =  0.0
		return answer

x = Mystery(2.5);

Answer: x = 7.5

Problem 2:
Consider the following program:

	def Demo( theList, answer):
		theList[0] = theList[0]*2
		answer = theList[0] + 3.5

	myList = [20]
	myResult = 4.8
	Demo(myList, myResult)
	print myList
	print myResult

Answer:  
[40]
4.8

Problem 3: a)Write a function,

	def sumOfIntegers( n ):

def sumOfIntegers(n):
	answer = 0
	for i in range(1, n+1):
		answer = answer + i
	return answer

b) Write a Python statement to compute the sum of integers from 1 to 100 using the above function and store the answer in the variable, hundredSum.

Answer:

hundredSum = sumOfIntegers(100)

4) What is the output of the following program?

	#program: review.py
	import sys
	def reverse(word, n):
		if n < 0:
			print
		else:
			sys.stdout.write(word[n])
			reverse(word, n-1)
	myWord = "back"
	reverse(myWord, len(myWord) -1)

Answer: kcab

5) a) Write a class, Student, that has three properties, gradYear, name and gpa.
The class should hava a constructor function that sets the values of these properties when the object is created.
The class should have a function, printInfo( ), that prints out the values of the students name, graduation year and GPA.

Answer:

class Student:
    def __init__(self, my_name, graduationYear, my_gpa):
        self.name = my_name
        self.gradYear = graduationYear
        self.gpa = my_gpa
    def printInfo(self):
        print self.name
        print self. gradYear
        print self.gpa

Answer:

aStudent = Student("Jane Doe", 2010, 2.75)
aStudent.printInfo( )

Problem 6: a) Convert to binary
237 = 11101101
45 = 00101101
63 = 00111111

b) Convert to hexadecimal
237 = ED
45 = 2D
63 = 3F

Problem 7: Convert to signed magnitude, 1's complement, and 2's complement:

Decimal	Signed magnitude	1's complement	2's complement
22	00010110	00010110	00010110
-31	10011111	11100000	11100001
-22	10010110	11101001	11101010
49	00110001	00110001	00110001

Problem 8: Add the following two binary numbers:

Binary	Decimal
01110001	113
+ 00011100	+ 28
= 10001101	= 141

Problem 9: draw a circuit that computes the truth table:

a	b	c
0	0	0
0	1	1
1	0	1
1	1	0

There are several possible solutions. The simplest uses an exclusive or (XOR) gate.

Another possible solution uses AND and OR gates and Inverters.

Problem 10: Write an expression for the output of the given circuit. Draw the truth table: