A RPN calculator program computes expressions written in RPN (Reverse Polish Notation).
A RPN expression (or a postfix expression) is one of the following:
- a number X, in which case the value of the expression is that of X;
- a sequence of the form
E1 E2 O
, where E1 and E2 are postfix expressions and O is an arithmetic operation; in this case, the value of the expression is that ofE1 O E2
.
The following are RPN expressions:
1
=>1
1 2 +
=>(1 + 2) = 3
20 5 /
=>(20 / 5) = 4
4 2 + 3 -
=>(4 + 2) - 3 = 3
3 5 8 * 7 + *
=>3*((5*8) + 7) = 141
Once this calculator works, add the SQRT
operator:
9 SQRT
=>√9 = 3
Once the SQRT
operator has been added, add the MAX
operator:
5 8 1 4 2 MAX
=>8
4 5 MAX 1 2 MAX *
=>MAX(4, 5) * MAX(1, 2) = 10
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Firstly, either you fork this repository to put all your katas in the same repository, either you create a new repository per kata and push the kata boilerplate into it. Then replace the artifact coordinates used by the build system. Name the code kata too.
Make changes only in the "kata" branch.
You can use this shortened link if needed: tinyurl.com/yyekn5rf.
You may want to commit with another identifier to publish your code later. Nothing's easier:
git config user.email "public@example.com"
git config user.name "Your Pseudo" # if needed
Take advantage of your IDE shortcuts while resolving any code kata. Download and print the keymap of IntelliJ IDEA. The table below should be very useful to learn, or to learn again, the most important shortcuts.
Theme | Must Know | Should Know | Could Know |
---|---|---|---|
General |
Ctrl + Alt + S to open settings |
Ctrl + Shift + A to find action |
|
Editing |
Ctrl + Space to call basic code completion Shift + Enter to start new line Ctrl + Alt + L to auto-indent lines Ctrl + Y to delete line at caret Ctrl + Numpad +/- to expand/collapse code block |
Ctrl + X to cut current line to clipboard Ctrl + Q to call quick documentation lookup Alt + Inser to generate code... |
|
Refactoring |
Shift + F6 to rename |
Ctrl + Alt + M to extract method Ctrl + Alt + V to extract variable Ctrl + Alt + F to extract field Ctrl + Alt + C to extract constant Ctrl + Alt + P to extract parameter |
|
Navigation |
Ctrl + N to go to class Ctrl + Shift + N to go to file Alt + PageUp/PageDown* to navigate back / forward Ctrl + B to go to declaration Ctrl + Alt + B to go to implementation(s) |
Ctrl + G to go to line |
|
Compile and Run |
Shift + F10 / F9 to run / debug Ctrl + Shift + F10 to run contexte configuration from editor |
||
Usage Search |
Alt + F7 to find usages Ctrl + Alt + F7 to show usages |
If a shortcut is marked with a '*', it is to configure in the keymap settings of the IDE.
You can invoke a standalone JAR after building it with the "standalone" Maven profile.
mvn package -Pstandalone # to build it
java -jar target/kata-standalone.jar # to use it
Update your fork as follows. It is assumed you did not commit in the "master" branch. Otherwise please send me a pull request.
git fetch origin master && git rebase -p --onto origin/master master develop && git branch -f master origin/master
What should be a DoD for the code katas?
- The kata is done by applying Test-Driven Development (TDD).
- The code is versioned by applying TDDflow.
- The path to the solution is discovered according to the Transformation Priority Premise.
- The path of successive transformations is as simple as possible.
- The code coverage is greater than 95%.
- The problem to solve is described in the kata documentation.
This code kata boilerplate is distributed under the GNU GPLv3 license. The GPLv3 license is included in the LICENSE.txt file. More information about this license is available at GNU.org.