This app is an app that can be calculated while looking at the formula.
Calculation along the laws of arithmetic
Unlike the input of a general computer, the calculation of the correct order of () is used and the priorities of the division and multiplication is possible.
If you make a mistake a formula, correction is possible by tapping the part of the formula.
The formula, or a division is used in programming the "slash /",
Multiplication of the "asterisk *" is also available.