// Function definition
function greet(name)
  print("Hello, " + name)
end

greet("Alice")
greet("Bob")

// Function with return value
function add(x, y)
  return x + y
end

result = add(5, 3)
print(result)

// Conditional logic
function classify(score)
  if score >= 90 then
    return "A"
  elseif score >= 80 then
    return "B"
  elseif score >= 70 then
    return "C"
  else
    return "F"
  end
end

print(classify(95))
print(classify(85))
print(classify(75))
print(classify(60))