https://github.com/bfontaine/jcalc
toy stack-based calculator
https://github.com/bfontaine/jcalc
experimental gui java
Last synced: over 1 year ago
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toy stack-based calculator
- Host: GitHub
- URL: https://github.com/bfontaine/jcalc
- Owner: bfontaine
- License: mit
- Created: 2014-05-08T22:51:31.000Z (about 12 years ago)
- Default Branch: master
- Last Pushed: 2014-05-11T19:53:44.000Z (about 12 years ago)
- Last Synced: 2025-03-23T23:43:40.892Z (over 1 year ago)
- Topics: experimental, gui, java
- Language: Java
- Homepage:
- Size: 203 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
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README
# JCalc
[](https://travis-ci.org/bfontaine/JCalc)
`JCalc` is a toy stack-based calculator written in Java. It was made to learn
the Swing API, not as a real project.
## Build
mvn install
## Run
java -jar target/JCalc-1.0.jar
Or double-click on the jar to open the app.
## Usage
`JCalc` uses a stack, which means you can make complicated operations which
deal with priorities without using parentheses. To add the current value to the
stack, press the “push” button (`<<`). You can now type a new value, and either
push it on the stack or use one of the six simple operations.
An operation pop the top of the stack, applies itself on it and the current
value (in that order), and replace the current value with the result.
You can reset everything at any time with the `R` button.
### Example
We want to compute `(3+5)*(4-2)`. In the following table, the first column shows
the pressed button, the second one shows the resulting value and the last one
the internal stack (top on the right).
| Command | Result | Stack |
|---------|-------:|:------|
| `3` | 3 | - |
| `<<` | - | 3 |
| `5` | 5 | 3 |
| `+` | 8 | - |
| `<<` | - | 8 |
| `4` | 4 | 8 |
| `<<` | - | 8, 4 |
| `2` | 2 | 8, 4 |
| `-` | 2 | 8 |
| `*` | **16** | - |