Module 1Functions & Control FlowLesson 10 of 1025 min

Module 1 Practice Lab

Capstone mini-lab: mini blotter combining variables, functions, formatting, and loops.

Lab goals

Wire together everything from Module 1 into a tiny blotter printer:

Store several trades as tuples (name, qty, price) in an array
Function trade_notional(qty, px)
Loop to print each line and a total

This is deliberately simple — no structs/Vec yet — so you feel fluent with basics before ownership.

Design sketch

trades: [("AAPL", 10, 190.0), ("MSFT", -5, 420.0), ...]
for each trade:
  print side from sign of qty
  print notional
sum absolute notionals or net cash

Stretch ideas (after you finish)

Flag any |qty| above a limit
Print running net notional after each line

Take your time — re-run often.

Challenge

Also compute net cash (sum of signed notionals) and print long vs short counts.

Tips

Array of tuples is fine for tiny labs
abs() on f64 for gross exposure style metrics
Next module: ownership will explain why String vs &str matters for symbols

Try it live

Module 1 Practice LabRust 2021

Loading editor…

Output

Press Run to compile and execute.