Designing this app based on easy and clearly concept. The purpose is that users can use it easily anytime and anywhere.
During the process of using other calculator apps, If you press the wrong key and you have to back to square one. If you are persecuted by this problem, you can try to use this app. when you press the wrong key, you can delete or edit the wrong item anytime and you also can check the item you have inputted before. it is easy and convenient,isnt it?