#Command-Line Entry (Mini Tutorial)

#Why it exists

• print a value
• call a library function
• verify a small idea without editing tests

#How to run it

moon run cmd/main

#What to edit

• cmd/main/main.mbt contains fn main.
• Keep it small. Real algorithms and documentation live in modules/.

#Example: call a library function

1. Add the package to cmd/main/moon.pkg:

{
  "import": [
    "bobzhang/loop_invariants_data_structures/avl_tree"
  ]
}

2. Call it in cmd/main/main.mbt:

///|
fn main {
  let sorted = @avl_tree.avl_sorted([3L, 1L, 4L, 1L][:])
  println("sorted = \{sorted}")
}

3. Run:

moon run cmd/main

#Example output

sorted = [1, 1, 3, 4]

#Notes and best practices

• Keep demos tiny and focused.
• Avoid heavy computations or long output here.
• Use tests (moon test) for real verification.
• Remove temporary imports when you are done.