1. The University of Texas – Pan American
CSCI/CMPE 4341 Topic: Programming in Python Chapter 4: Control Structures (Part 2) – Exercises
Xiang Lian
The University of Texas – Pan American
Edinburg, TX 78539
This set of slides is revised from lecture slides of Prof. John Abraham. -- Xiang Lian

2. Objectives In this chapter, you will do some exercises about:
basic control structures in Python

3. Multiple Choices
Typically, ______ statements are used for counter-controlled repetition.
A. for B. while C. repetition D. until
Typically, ______ statements are used for sentinel-controlled repetition.
The _________statement, when executed in a repetition statement, skips the remaining statements in the loop body and proceeds with the next iteration of the loop.
A. break B. exit C. continue D. return
The _____operator can be used to ensure that two conditions are both true before choosing a certain path of execution
A. and B. && C. or D. ||
An infinite loop occurs when the loop-continuation condition in a while statement______.
A. never becomes true B. never becomes false C. is false D. is true for finite times

4. Multiple Choices (cont'd)
What is the range of function call range(1, 10)?
A. [0, 10] B. [0, 10) C. [1, 10] D. [1, 10)
What is the value of the expression of 4/5*2+2**(1+2)?
A B C D. 8.4
What is the value of 5/4, 5//4, and 5%4?
A. 1, 1.25, 1 B. 1.25, 1, 4 C. 1, 1, 1 D. 1.25, 1, 1
Which of the following is the appropriate for statement for varying the control variable over the following sequence of values: 5, 10, 15, 20, 25?
A. for i in range(25): B. for i in range (5, 25):
C. for i in range(5, 25, 5): D. for i in range(25, 5, -5):

5. True/False Statements
The exponentiation operator ** associates left to right.
Function call range (4, 7) returns the sequence 4 to 7, inclusive.
Sentinel-controlled repetition uses a counter variable to control the number of times a set of instructions executes.
String format specifier "%5d" outputs integer with right alignment by default.
The expression ((x>y) and (a<b)) is True if either (x>y) is True or (a<b) is True.
An expression containing the or operator is True if either or both of its operands are True.
The and operator has a higher precedence than the or operator.

6. What Does the Code Do? for i in range(1, 11): for j in range (1, 11):
print end = "");
print ("");

7. Debug Errors
counter=1
For i in range (1, 10)
counter++

8. Write a Program
Use nested for statement to write a Python program to display the triangle of asterisks. Use the following statements:
print ("*", end="") # displays asterisks one at a time
print ("") # the cursor goes to a new line
print (" ", end="") # inserts a space *
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
* * * * * * * * * *
* * * * * * * * * *
* * * * * * * * *
* * * * * * * *
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* * *
* * * * * * * * * *
* * * * * * * * *
* * * * * * * *
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* * * *
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
* * * * * * * * * *

9. Write a Program (cont'd)
Use nested for statement to write a program to display a rectangle. Use the following statements:
print ("+", end="")
print ("-", end="")
print ("|", end="")
print ("")
print (" ", end="")
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