Category: Projects

Random numbers, Loops, Conditionals

number = rand(1..10)
attempts = 0

puts "Guess the number (1-10):"

loop do
  guess = gets.chomp.to_i
  attempts += 1

  if guess == number
puts "🎉 Correct! You guessed it in #{attempts} tries."
break
  elsif guess < number
puts "Too low! Try again."
  else
puts "Too high! Try again."
  end
end

Explanation:

• rand(1..10) generates random number.
• Keeps track of attempts.
• Gives hints (too low, too high).

File Handling, Loops

FILENAME = "notes.txt"

loop do
  puts "\n--- Notes App ---"
  puts "1. Write Note"
  puts "2. View Notes"
  puts "3. Exit"
  print "Choose option: "
  choice = gets.chomp.to_i

  case choice
  when 1
print "Enter your note: "
note = gets.chomp
File.open(FILENAME, "a") { |f| f.puts(note) }
puts "Note saved!"
  when 2
if File.exist?(FILENAME)
  puts "\nYour Notes:"
  puts File.read(FILENAME)
else
  puts "No notes found."
end
  when 3
puts "Goodbye!"
break
  else
puts "Invalid option."
  end
end

Explanation:

• "a" → appends to file without deleting old notes.
• File.read → reads all notes.
• Stores notes in notes.txt.

Concepts Used: Hashes, Loops, Conditionals

students = {}

loop do
  puts "\n--- Student Grade Manager ---"
  puts "1. Add Student"
  puts "2. View Students"
  puts "3. Exit"
  print "Choose option: "

  choice = gets.chomp.to_i

  case choice
  when 1
print "Enter student name: "
name = gets.chomp
print "Enter grade: "
grade = gets.chomp
students[name] = grade
puts "Student added!"
  when 2
puts "\nStudents List:"
students.each { |name, grade| puts "#{name} - #{grade}" }
  when 3
puts "Goodbye!"
break
  else
puts "Invalid choice!"
  end
end

Explanation:

• Uses a hash → { "Ali" => "A", "Sara" => "B" }.
• Allows adding and viewing students.

Concepts Used: Methods, Conditionals, Loops

def calculator
  puts "Enter first number:"
  a = gets.chomp.to_f

  puts "Enter second number:"
  b = gets.chomp.to_f

  puts "Choose operation (+, -, *, /):"
  op = gets.chomp

  result = case op
       when "+" then a + b
       when "-" then a - b
       when "*" then a * b
       when "/" then b != 0 ? a / b : "Error: Division by zero"
       else "Invalid operation"
       end
  puts "Result: #{result}"
end

calculator

Explanation:

• gets.chomp → reads user input.
• case ... when → chooses operation.
• Handles division by zero.

Concepts Used: Arrays, Loops, Methods, File Handling

tasks = []

loop do
  puts "\n--- To-Do List ---"
  puts "1. Add Task"
  puts "2. View Tasks"
  puts "3. Remove Task"
  puts "4. Exit"
  print "Choose option: "

  choice = gets.chomp.to_i

  case choice
  when 1
print "Enter task: "
task = gets.chomp
tasks << task
puts "Task added!"
  when 2
puts "\nYour Tasks:"
tasks.each_with_index { |t, i| puts "#{i+1}. #{t}" }
  when 3
print "Enter task number to remove: "
num = gets.chomp.to_i
if num > 0 && num <= tasks.length
  tasks.delete_at(num-1)
  puts "Task removed!"
else
  puts "Invalid task number."
end
  when 4
puts "Goodbye!"
break
  else
puts "Invalid choice!"
  end
end

Explanation:

• Stores tasks in an array.
• Uses loop do ... end for continuous menu.
• each_with_index → shows tasks with numbers.
• delete_at → removes task by index.