This is a very simple calculator written for/in RobotCarol, a program/language used to teach basic programming concepts to children. It was mainly written as a fun challenge in remembrance of a binary calculator I wrote in RobotCarol back in highschool, but I think it also shows quite well how much is possible even in a very simple language (RobotCarol is turing complete after all, at least if you had an infinite world).
- Load the
world.kdwworld or run thebuild_world.kdpprogram in an empty world (width >= 47, height >= 17 and block height must be 10) - Write the two input numbers into the input fields in the world. The left side of the example world shows how the numbers should be written.
- Modify the arithmetic operator in the world to the operation you want to perform (
+for adding,-for subtracting,xfor multiplication,:for division) - Run the
calc.kdpprogram
If there is a remainder after a division, it will be written on the right of the output number.
The actual calculation is performed in the top right. The first two rows are inputs for an addition. The next row is the carry line and the 4th line is the result.
The other red line further down is a register for saving and moving values around.
All operations are emulated using addition. Subtraction is just addition of the inverted value plus a carry. Multiplication is just repeated addition and division is repeated subtraction.
All the code in this repository is in the public domain. Or if you prefer, you may also use it under the MIT license or CC0 license.