CSE 3901 EXAM PREP QUESTIONS AND
ANSWERS 2026 STUDY GUIDE
◉ the project itself. Answer: github: what is a working tree?
◉ hidden directory (.git) in root directory of working tree
User never accesses .git directly
Store records project development history. Answer: github: what is a
store?
◉ DAG of commits
Each commit represents a complete snapshot of the entire project.
Answer: github: what is history?
◉ virtual snapshot stored in .git/index. Answer: github: what is an
index?
◉ a pointer to a commit. Answer: github: what is a branch?
,◉ git branch nameOfBranch. Answer: github: command to create a new
branch
◉ git checkout fix. Answer: github: change to branch titled 'fix'
◉ git add --all .
git commit. Answer: github: add and commit changes to local store
◉ http://web.cse.ohio-state.edu/~giles/3901/lectures/lecture02.pdf.
Answer: github: problem on slide 42 http://web.cse.ohio-
state.edu/~giles/3901/lectures/lecture02.pdf
◉ 0, 1, 2, 3, 4. Answer: ruby: what is the following range 0..4
◉ 0, 1, 2, 3. Answer: ruby: what is the following range 0...4
◉ Returns -1/0/1 if LHS is smaller/equal/larger than RHS. Answer:
ruby: what does the <=> operator do?
◉ -1. Answer: ruby: what does "cab" <=> "da" return?
◉ 1. Answer: ruby: what does "cab" <=> "ba" return?
,◉ i = 34, j = 35. Answer: i = 34
j = i # i and j are aliases
j = j + 1 # does this increment i too?
what is the value of i and j?
◉ prints 0 to 24. Answer: what does the following statement do?
i = 10
25.times { | i | puts i }
◉ "tania".length. Answer: ruby: write a statement that returns the length
of your name
◉ "exam".reverse. Answer: ruby: write a statement that reverses the
word "exam"
◉ puts "Tania".upcase. Answer: ruby: write a statement that prints
"Tania" in uppercase
◉ puts "Tania".downcase. Answer: ruby: write a statement that prints
"Tania" in lowercase
◉ puts "What is your first name?"
name = gets.chomp
, puts "Your first name is #{name.capitalize!}". Answer: ruby: write a
statement that asks for the users first name and prints the result in the
following format: Your first name is (name). The name should be
capitalized
◉ for i in 1..20
next if i % 2 != 0
puts i
end. Answer: ruby: write a for loop that prints all even numbers between
1 and 20
◉ num = 1
until num > 10
puts num
num += 1
end. Answer: ruby: write a looping using until that prints numbers 1 to
20
◉ Start of method
In the block
In the block
End of method. Answer: What does the following code output?
def call_block
ANSWERS 2026 STUDY GUIDE
◉ the project itself. Answer: github: what is a working tree?
◉ hidden directory (.git) in root directory of working tree
User never accesses .git directly
Store records project development history. Answer: github: what is a
store?
◉ DAG of commits
Each commit represents a complete snapshot of the entire project.
Answer: github: what is history?
◉ virtual snapshot stored in .git/index. Answer: github: what is an
index?
◉ a pointer to a commit. Answer: github: what is a branch?
,◉ git branch nameOfBranch. Answer: github: command to create a new
branch
◉ git checkout fix. Answer: github: change to branch titled 'fix'
◉ git add --all .
git commit. Answer: github: add and commit changes to local store
◉ http://web.cse.ohio-state.edu/~giles/3901/lectures/lecture02.pdf.
Answer: github: problem on slide 42 http://web.cse.ohio-
state.edu/~giles/3901/lectures/lecture02.pdf
◉ 0, 1, 2, 3, 4. Answer: ruby: what is the following range 0..4
◉ 0, 1, 2, 3. Answer: ruby: what is the following range 0...4
◉ Returns -1/0/1 if LHS is smaller/equal/larger than RHS. Answer:
ruby: what does the <=> operator do?
◉ -1. Answer: ruby: what does "cab" <=> "da" return?
◉ 1. Answer: ruby: what does "cab" <=> "ba" return?
,◉ i = 34, j = 35. Answer: i = 34
j = i # i and j are aliases
j = j + 1 # does this increment i too?
what is the value of i and j?
◉ prints 0 to 24. Answer: what does the following statement do?
i = 10
25.times { | i | puts i }
◉ "tania".length. Answer: ruby: write a statement that returns the length
of your name
◉ "exam".reverse. Answer: ruby: write a statement that reverses the
word "exam"
◉ puts "Tania".upcase. Answer: ruby: write a statement that prints
"Tania" in uppercase
◉ puts "Tania".downcase. Answer: ruby: write a statement that prints
"Tania" in lowercase
◉ puts "What is your first name?"
name = gets.chomp
, puts "Your first name is #{name.capitalize!}". Answer: ruby: write a
statement that asks for the users first name and prints the result in the
following format: Your first name is (name). The name should be
capitalized
◉ for i in 1..20
next if i % 2 != 0
puts i
end. Answer: ruby: write a for loop that prints all even numbers between
1 and 20
◉ num = 1
until num > 10
puts num
num += 1
end. Answer: ruby: write a looping using until that prints numbers 1 to
20
◉ Start of method
In the block
In the block
End of method. Answer: What does the following code output?
def call_block
