Only by using 3 seven segment display(without using lcd display), similar to as shown in the picture, using Tinkercad, build a calculator. It should have 3 7-segment displays and a number pad. The system should start with a summation of 0. You don't have to display negative numbers. The user should be able to press numbers to enter upto 3 digit number. This number should be displayed on the 7 segments. If the user presses A, the number should be added to the current number, if user presses B, the number should be subtracted and the display should be emptied to accept another number. If user presses C at any time, current summation should be displayed. D should 0 the current summation.

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.