You can just input two values, and then select the operation you want to do, you don't have to press the equal sign to get the result. When you press the digit, the current answer will be displayed directly at the top of screen!
You can use this application to calculate the operation of the two numbers, such as addition, subtraction, multiplication, dividsion, ratio, exchange rate and so on. Because it will automatically store the last operation, it is easy for you to use during travel. For example, you can input the exchange rate. The next time you turn it on, you can directly input the price for conversion, or press the switch button to change the position of the two digits to get the reverse answer.
If you mispress the digit, you can just press the delete button to delete the last digit, or press the C button to delete two numbers directly.