I would give 5 stars BUT...
The app doesn’t resume my calculation when I go back and forth changing between app (multitasking). It kinda like telling me to input new number but I already was halfway in my calculation. Example I input 35 x 5... (5 isnt complete and I had to switch app ie my bank account). After switching from my bank acc to pcalc, I cant resume 35 x 5 to 35 x 5.20 but instead telling me to put new inputs! Its so frustrating!