E-CodeProjectile from a height (dialog, m or ft) — a TI-89 Titanium program
PROJ89 is a TI-89 BASIC program for the TI-89 Titanium. A dialog takes launch speed, angle in degrees and launch height, and a drop-down picks meters or feet (g = 9.80665 or 32.174); shows the time of flight, range, peak height and impact speed.
What it asks for and what it shows
It asks for 3 values at its prompts, after you pick option 1 from its menu. In the example below it shows TIME S, RANGE, PEAK, IMPACT V.
Example run
One of its oracle test cases: “20 m/s at 30° off a 15 m ledge”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Menu | option 1 |
| Input 1 | 20 |
| Input 2 | 30 |
| Input 3 | 15 |
| The screen shows | |
TIME S= | 3.044307479 |
RANGE= | 52.72895227 |
PEAK= | 20.09858106 |
IMPACT V= | 26.34766593 |
How it's checked
4 test cases, each checked against an independent method. Replayed key by key on a virtual TI-89 Titanium, they make 21 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-89 Titanium calculator and pick “Projectile from a height (dialog, m or ft)” (PROJ89).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.