Breathlessness Assessment 與 Calculator with History ++ 使用情況與統計

Powerful Calculator Features: 1. Addition, subtraction, multiplication and division functions 2. The algorithm of large numbers will display every digit completely 3. With the history record function, the calculation results will be saved and displayed, which is convenient for continuing calculations later 4. Enter the character-by-character rollback function 5. Conveniently clear the information on the screen