Comment by j45

In high school my teachers were ok with me writing an app based on the formula sheets on my TI.

Some other students had complained, but the teacher knew I wrote the app and it required me to understand the math and risk my grades if I was wrong.

One teacher in specific said anyone was welcome to learn to program their calculator as long as they wrote it themselves and no two apps should look the same. I remember giving the teacher my app.

I was surprised and thought I might have to delete the app.