D. Do the online reading: <a href="http://www.rose-hulman.edu/class/csse/csse120/VideoFiles/11.1-OverloadingThePlusSymbol/Handouts/OverloadingThePlusSymbol.pdf" target=newtab><b>Overloading the plus operator</b></a>, doing the next set of questions while you do so.
1. <code>11 + 22</code> evaluates to: (NOTE: write <code>error</code> if evaluating the expression generates an error.)
ANS. 33
2. <code>'11' + '22'</code> evaluates to: (NOTE: write <code>error</code> if evaluating the expression generates an error.)
ANS. '1122'
ANS. 1122
ANS. "1122"
3. <code>'11' + str(3 + 3) + '22'</code> evaluates to: (NOTE: write <code>error</code> if evaluating the expression generates an error.)
ANS. '11622'
ANS. "11622"
ANS. 11622
4. <code>'11' + 33</code> evaluates to: (NOTE: write <code>error</code> if evaluating the expression generates an error.)
ANS. error
ANS. ERROR
5. What does the following code snippet print: <pre> x = 1 <br> y = 2 <br> z = 3 <br> print(x, y, z)</pre>
a. <code>1, 2, 3</code>
b. <code>1 2 3</code>~
c. <code>6</code>
d. <code>123</code>
6. What does the following code snippet print: <pre> x = 1 <br> y = 2 <br> z = 3 <br> print(str(x) + str(y) + str(z))</pre>
a. <code>1, 2, 3</code>
b. <code>1 2 3</code>
c. <code>6</code>
d. <code>123</code>~
7. What does the following code snippet print: <pre> x = 1 <br> y = 2 <br> z = 3 <br> print(x + y + z)</pre>
a. <code>1, 2, 3</code>
b. <code>1 2 3</code>
c. <code>6</code>~
d. <code>123</code>
8. What does the following code snippet print: <pre> x = 1 <br> y = 2 <br> z = 3 <br> print(str(x + y) + str(z))</pre>
ANS. 33
9. Implement a function named <code>print_equation</code> that given two numbers <code>x</code> and <code>y</code>, prints an equation for the sum of them. For example, if <code>x</code> is <code>65</code> and <code>y</code> is <code>11</code>, the function would print <code>65+11=76</code>.
M. Line 1 -> def print_equation(x, y):
M. Line 2 -> print(str(x) + "+" + str(y) + "=" + str(x+y))
M. -> print(x, y, x+y)
M. -> print(x+++y+ = +x+y)
M. -> print("65+11=76")
D. Do the online reading: <a href="http://www.rose-hulman.edu/class/csse/csse120/VideoFiles/11.2-AccumulatingSequences/Handouts/AccumulatingSequences.pdf" target=newtab><b>Accumulating Sequences</b></a>, doing the next set of questions while you do so.
D. On a piece of paper (NOT here in Moodle), implement the following function, per its doc-string. You do NOT have to be completely correct, just try to get the main idea correct, with guidance from the reading. After you have made a reasonable try, turn to the next page in this Moodle quiz for a solution. <pre>def make_simple_list(m, n):<br> """<br> Returns the list [m, m+1, m+2, ... n],<br> where m and n are the given arguments.<br> For example, if m is 5 and n is 13,<br> then this function returns:<br> [5, 6, 7, 8, 9, 10, 11, 12, 13]<br> """</pre>
D. Here is a solution to the previous problem. Compare your solution to it. Bring any questions about this problem to class.<pre>def make_simple_list(m, n):<br> """ Same specification as on the previous item. """<br> seq = []<br> for k in range(m, n + 1):<br> seq = seq + [k]<br> return seq<br></pre>
1. Consider the following code. What should the missing statement be (that is, the statement marked ???).<pre>def make_list(n):<br> """<br> Returns the list [1, 2, 3, ... n],<br> where n is the given argument.<br> For example, if n is 5,<br> then this function returns:<br> [1, 2, 3, 4, 5]<br> """<br> seq = []<br> for k in range(n):<br> ???<br> return seq<br></pre>
a. <code> seq = seq[k]</code>
a. <code> seq = seq[k + 1 ]</code>
b. <code> seq = seq + k</code>
b. <code> seq = seq + k + 1</code>
c. <code> seq = seq[k] + [k]</code>
d. <code> seq[k] = seq[k] + [k]</code>
e. <code> seq = seq + [k + 1]</code>~
e. <code> seq = seq + seq[k]</code>
e. <code> seq = seq + seq[k + 1]</code>
2. What does the following code snippet print: (Note: If your answer includes any commas, put a SINGLE SPACE after each comma, to help out the automated grading. But no problem if you get the right answer except for spaces.) <pre> x = 0 <br> for k in range(5): <br> x = x + (2 * k) <br> print(x) </pre>
ANS. 20
2. What does the following code snippet print: (Note: If your answer includes any commas, put a SINGLE SPACE after each comma, to help out the automated grading. But no problem if you get the right answer except for spaces.) <pre> x = [] <br> for k in range(5): <br> x = x + [(2 * k)] <br> print(x) </pre>
ANS. [0, 2, 4, 6, 8]
2. What does the following code snippet print: (Hint: ignore the comma in the code, but ask in class why it is necessary.) (Note: If your answer includes any commas, put a SINGLE SPACE after each comma, to help out the automated grading. But no problem if you get the right answer except for spaces.) <pre> x = () <br> for k in range(5): <br> x = x + ((2 * k),) <br> print(x) </pre>
ANS. (0, 2, 4, 6, 8)
2. What does the following code snippet print: (Note: If your answer includes any commas, put a SINGLE SPACE after each comma, to help out the automated grading. But no problem if you get the right answer except for spaces.) <pre> x = '' <br> for k in range(5): <br> x = x + str(2 * k) <br> print(x) </pre>
ANS. 02468
ANS. '02468'
ANS. "02468"
D. In the above question, make sure that you understand why applying the built-in <code>str</code> function is necessary.
D. Watch the video: <a href="http://www.rose-hulman.edu/class/csse/csse120/VideoFiles/11.3-PatternsForIteratingThroughSequences/Video/PatternsForIteratingThroughSequences/PatternsForIteratingThroughSequences.mp4" target=newtab><b>Sequences</b></a>, doing the next set of questions while you do so.
D. For the next set of questions, consider the following three function definitions:<pre>def foo1(seq):<br> total = 0<br> for k in range(len(seq) // 2):<br> total = total + seq[1 + (2 * k)]<br> return total<br><br><br>def foo2(seq):<br> total = 0<br> for k in range(1, len(seq), 2):<br> total = total + seq[k]<br> return total<br><br><br>def foo3(seq):<br> total = 0<br> m = 1<br> for _ in range(len(seq) // 2):<br> total = total + seq[m]<br> m = m + 2<br> return total<br></pre>
1. To what number does <code>foo1([3])</code> evaluate?
a. 0~
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo1([3, 6])</code> evaluate?
a. 0
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6~
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo1([3, 6, 1, 4, 9, 5])</code> evaluate?
a. 0
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15~
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo2([3])</code> evaluate?
a. 0~
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo2([3, 6])</code> evaluate?
a. 0
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6~
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo2([3, 6, 1, 4, 9, 5])</code> evaluate?
a. 0
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15~
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo3([3])</code> evaluate?
a. 0~
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo3([3, 6])</code> evaluate?
a. 0
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6~
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
1. To what number does <code>foo3([3, 6, 1, 4, 9, 5])</code> evaluate?
a. 0
b. 1
c. 2
d. 3
e. 4
f. 5
g. 6
h. 7
i. 8
j. 9
k. 10
l. 11
m. 12
n. 13
o. 14
p. 15~
q. 16
r. 17
r. 18
r. 19
r. 20
r. 24
r. 33
r. 38
D. For the next set of questions, consider the following two attempts at a function that <strong>returns the first negative item in the sequence of numbers, or <code>None</code> if the sequence contains no negative numbers.</strong> One function is correct and the other is wrong. <pre>def find1(numbers):<br> for k in range(len(numbers)):<br> if numbers[k] < 0:<br> return numbers[k]<br> else:<br> return None<br><br><br>def find2(numbers):<br> for k in range(len(numbers)):<br> if numbers[k] < 0:<br> return numbers[k]<br> return None<br></pre>
1. What gets returned by the function call <code>find1( [-3, 6, 1, 4, 9, 5] )</code>?
ANS. -3
1. What gets returned by the function call <code>find2( [-3, 6, 1, 4, 9, 5] )</code>?
ANS. -3
1. What gets returned by the function call <code>find1( [3, 6, 1, 4, 9, 5] )</code>?
ANS. None
1. What gets returned by the function call <code>find2( [3, 6, 1, 4, 9, 5] )</code>?
ANS. None
1. What gets returned by the function call <code>find1( [3, -6, 1, 4, 9, 5] )</code>?
ANS. None
1. What gets returned by the function call <code>find2( [3, -6, 1, 4, 9, 5] )</code>?
ANS. -6
1. Which attempt is correct?
a. <code>find1</code>
b. <code>find2</code>~
D. IMPORTANT: Be sure that you understand the previous problem and its answer! Bring questions to class!