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Description
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shown to student

This is an extension of the <a href='javascript:websheets.load("java/00-intro/SquareSwap")'>SquareSwap</a> websheet.
Given an array <code>colors</code> of <code>n</code> strings,
move each string one position later in the array; and, you
must move the one at the end to the start.

Epilogue
html markup
shown when solved

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Remarks
Comments, history, license, etc.

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Engine
Choices
json list of string, bool pairs
e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

public static void main(String[] args) {
// the grader will pre-define an array of color names
String[] colors = \fake[...; // e.g. new String[] {"red", "blue", "green"};]\ \hide[args.clone();]\
int n = colors.length; // for convenience

System.out.println("Before n-swapping:");
for (int i=0; i<n; i++)
System.out.println("color " + i + " is " + colors[i]);

// your swapping code here:
\[
String tmp = colors[n-1];
for (int i=n-1; i>=1; i--)
colors[i] = colors[i-1];
colors[0] = tmp;
]\
System.out.println("After n-swapping:");
for (int i=0; i<n; i++)
System.out.println("color " + i + " is " + colors[i]);
}

Template / Reference solution

Java test suite
See manual

title = "Running with <tt>colors[] = {\"red\", \"green\", \"blue\"}</tt>";
testMain("red", "green", "blue");

title = "Running with <tt>colors[] = {\"fuschia\", \"turquoise\", \"sienna\", \"vermilion\"}</tt>";
testMain("fuschia", "turquoise", "sienna", "vermilion");

title = "Running with <tt>colors[] = {\"a\", \"b\", \"c\", \"d\", \"e\", \"f\", \"g\", \"h\"}</tt>";
testMain("a", "b", "c", "d", "e", "f", "g", "h");

title = "Running with <tt>colors[] = {\"monocolor\"}</tt>";
testMain("monocolor");

C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]
to just run once with no input use [{}]

C++ test suite
See manual

Forbidden substrings
json list of strings
e.g. ["for","while"]

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Solution visibility remove
Java imports
json list of importables
e.g. ["java.util.*"]

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Override Java classname
else defaults to
websheet name
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Dependent on other websheets?
json list of websheet names in this folder
e.g. ["DataStructure"]

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Is example?
i.e., just a demo
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Add compiler flag(s)
json list of flags
e.g. ["-Wno-unused-variable"]

remove
Remove default compiler flag(s)
json list of flags
see default_cppflags
e.g. ["-Wno-write-strings"]

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Property	Value
Description html markup shown to student	This is an extension of the <a href='javascript:websheets.load("java/00-intro/SquareSwap")'>SquareSwap</a> websheet. Given an array <code>colors</code> of <code>n</code> strings, move each string one position later in the array; and, you must move the one at the end to the start.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	remove
Engine
Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`
Correct answer
Template / Reference solution	public static void main(String[] args) { // the grader will pre-define an array of color names String[] colors = \fake[...; // e.g. new String[] {"red", "blue", "green"};]\ \hide[args.clone();]\ int n = colors.length; // for convenience System.out.println("Before n-swapping:"); for (int i=0; i<n; i++) System.out.println("color " + i + " is " + colors[i]); // your swapping code here: \[ String tmp = colors[n-1]; for (int i=n-1; i>=1; i--) colors[i] = colors[i-1]; colors[0] = tmp; ]\ System.out.println("After n-swapping:"); for (int i=0; i<n; i++) System.out.println("color " + i + " is " + colors[i]); }
Template / Reference solution
Java test suite See manual	title = "Running with <tt>colors[] = {\"red\", \"green\", \"blue\"}</tt>"; testMain("red", "green", "blue"); title = "Running with <tt>colors[] = {\"fuschia\", \"turquoise\", \"sienna\", \"vermilion\"}</tt>"; testMain("fuschia", "turquoise", "sienna", "vermilion"); title = "Running with <tt>colors[] = {\"a\", \"b\", \"c\", \"d\", \"e\", \"f\", \"g\", \"h\"}</tt>"; testMain("a", "b", "c", "d", "e", "f", "g", "h"); title = "Running with <tt>colors[] = {\"monocolor\"}</tt>"; testMain("monocolor");
C++ test suite json list of stdin/args tests e.g. `[{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]` to just run once with no input use `[{}]`
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	remove
Solution visibility	remove
Java imports json list of importables e.g. `["java.util.*"]`	remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. `["DataStructure"]`	remove
Is example? i.e., just a demo	remove
Add compiler flag(s) json list of flags e.g. `["-Wno-unused-variable"]`	remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.