What do you get if you do 1+2×3-4? Yes your are correct, the answer is 3. But what if you type it into your calculator? Some of you will still get 3, because your calculator is scientific. But some of you will instead get 5. Because you are using an standard calculator. This is a smart Scratch Cat. It is not limited to single-step expressions You can ask it any length of Elementary Arithmetic question! And it follows the order of operation! Wait a second what is "Elementary Arithmetic"? Well it's simply "+-×÷". And what is "Order of Operation"? I can't help on this. This is Grade 3 at least...BEDMAS okay? Alternatively, * and / to stand for × and ÷. * and / is mostly used on computers. Oh one more thing...There is no (), ^, ±, √, but decimals are okay. 1. Any *forbidden* characters will stop it from thinking, but it still don't refuse any incomplete problems. Please don't do it. 2. No spaces sorry...(Allow spaces would lead more errors like 3 5 = 3 5)(Check out @FloogleMan's comment down there...) 3. If it still errors even you followed the above rules, tell me that in the comments. 4. Do NOT touch that gray star unless you really like this project.. 5. Come on I did not say not touch that gray heart...If we break 5 likes I will **************** [EDIT LOG] Α First release, not interested...... Β @bumm543's comment kind of asked me to improve explanation so I did. Γ Revision including Edit Log, improve of sripts, and some EE (͡° ͜ʖ ͡°)