cpp/var-expr/4swap Source

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Description
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shown to student

This program reads in 4 strings, representing the top, bottom, left, right
colors of the sides
of a square. Your program should <i>rotate the square 90 degrees clockwise</i>
and output the top, bottom, left, right colors after the rotation.
<p>
For example if the input is <tt>red green blue yellow</tt> then the rotation
looks like this:
<div><img src="http://cscircles.cemc.uwaterloo.ca/websheets/images/FourSwap.ipe.png"></div>
and the output should be <tt>blue yellow green red</tt>.
<p>
Hint: use a variant of the <i>swap idiom</i>.

Epilogue
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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

Template / Reference solution

#include <iostream>
#include <string>
using namespace std;

int main() {
string top, bottom, left, right;
cin >> top >> bottom >> left >> right;
// now do something clever to update the variables!
\[
string t = top;
top = left;
left = bottom;
bottom = right;
right = t;
]\
cout << top << " " << bottom << " " << left << " " << right;
return 0;
}

Java test suite
See manual

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 [{}]

[
{"stdin": "red green blue yellow"},
{"stdin": "fuschia vermilion salmon ochre"}
]

C++ test suite
See manual

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

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Java imports
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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"]

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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 program reads in 4 strings, representing the top, bottom, left, right colors of the sides of a square. Your program should <i>rotate the square 90 degrees clockwise</i> and output the top, bottom, left, right colors after the rotation. <p> For example if the input is <tt>red green blue yellow</tt> then the rotation looks like this: <div><img src="http://cscircles.cemc.uwaterloo.ca/websheets/images/FourSwap.ipe.png"></div> and the output should be <tt>blue yellow green red</tt>. <p> Hint: use a variant of the <i>swap idiom</i>.
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
Template / Reference solution	#include <iostream> #include <string> using namespace std; int main() { string top, bottom, left, right; cin >> top >> bottom >> left >> right; // now do something clever to update the variables! \[ string t = top; top = left; left = bottom; bottom = right; right = t; ]\ cout << top << " " << bottom << " " << left << " " << right; return 0; }
Java test suite See manual
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 `[{}]`	[ {"stdin": "red green blue yellow"}, {"stdin": "fuschia vermilion salmon ochre"} ]
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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