## Quiz 1 Study Guide

You are responsible for all material needed for Lab 1, plus basic `for` loops from Week 2 (see below for examples). We will not be covering the accumulator pattern or indexing on this quiz. We will also not be testing you on Unix or `vim` information.

Study guides are not graded. You may work with other students on the questions, and ask questions about the guide during evening ninja help sessions, or with meetings with faculty and staff. We do not provide full solutions to the study guides.

### Terms

You should understand the following terms:

• syntax

• semantics

• algorithm

• program

• Python as a programming language

• computer

• variable

• assignment

• data types: `int`, `float`, `str`

### Python concepts and functions

You should be able to use the following Python concepts and functions:

• assignment using `=`

• basic arithmetic expressions using +, -, *, /

• reading in strings using `input()`

• `int()`, `str()`, `float()`, and type conversion

• `print()`

• `def main():`

• basic `for` loops

• string concatenation and string multiplication

• basic accumulator pattern

• string indexing

### Sample practice problems

1) Write a program to convert a certain number of gallons (entered by the user) to liters. There are 3.79 liters in a gallon.

``````$python gallons.py Gallons: 2 That's 7.58 liters.`````` 2a) What is the value and type for each of the following expressions? Try them in `python3` to check your answers. For example, the answer to the first one (`2 + 3`) would be value `5` and type `int`. • 2 + 3 • 2.0 + 3 • 5 - 2 * 3 • "123" • 2.0 • "Swat" + "CS" • 7 // 2 • 7 % 2 2b) What sequence of values does `range(6)` produce? 3) Write a program that takes a user’s hotel room rate and outputs the cost after adding the 10% city tourism fee. The program should then output the total bill. ``````$ python bill.py
Room rate: 100
Total nights: 3
-------------------
Tourism Fee: $30.0 Total:$ 330.0``````

4) Show the output from the following code fragments:

``````for i in range(4):
print(i)
print("--")``````
``````for x in range(6):
print("x =", x)
print("done!")``````
``````n = 6
ch = "a"
for i in range(1, n+1):
print(str(i) + " " + ch*i)``````
``````r = 0
n = 6
for i in range(n):
r = r * i
print(r)``````

5) Write a program that asks the user for their name and a number (`n`), then prints out their name `n` times.

``````\$ python name.py
name: cs21
n: 6

cs21
cs21
cs21
cs21
cs21
cs21``````