cpp/cs102/lab9/gcd-nested Source

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Euclid's algorithm for computing the greatest common divisor (GCD) of
two integers: <tt>x</tt> and <tt>y</tt> can be expressed in pseudocode as:

<pre>
gcd(x,y) =>
while y ≠ 0
temp = y;
y := x mod y;
x := temp;
gcd = x;
</pre>

Complete the code below to repeatedly read in two numbers at a time and compute
their GCD and output it to the screen, stopping only when both numbers input are 0,
in which case you should stop and not output anything for that pair of integers.
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Copied from problem cpp/conditionals/rps (author: redekopp@usc.edu)
Copied from problem cpp/conditionals/taxbrackets (author: redekopp@usc.edu)
Copied from problem cpp/conditionals/nestedec (author: redekopp@usc.edu)
Copied from problem cpp/conditionals/extracredit (author: redekopp@usc.edu)
Copied from problem cpp/control/flag (author: daveagp@gmail.com)

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

Correct answer
Template / Reference solution

Template / Reference solution

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

int main() {
int x, y, gcd;
cin >> x >> y;

while( \[ ! (x == 0 && y == 0) ]\ ) {
\[
while(y != 0){
int t = y;
y = x % y;
x = t;
}
gcd = x;
]\
cout << gcd << endl;
\[
cin >> x >> y;
]\
}
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": "9 6 40 28 1071 462 0 0", "args": ""},
{"stdin": "4 2 8 4 16 8 32 16 64 32 128 64 256 128 512 256 1024 512 0 0", "args": ""},
{"stdin": "56 40 0 1 0 0 ", "args": ""}
]

C++ test suite
See manual

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Description html markup shown to student	<p>Euclid's algorithm for computing the greatest common divisor (GCD) of two integers: <tt>x</tt> and <tt>y</tt> can be expressed in pseudocode as:</p> <pre> gcd(x,y) => while y ≠ 0 temp = y; y := x mod y; x := temp; gcd = x; </pre> <p>Complete the code below to repeatedly read in two numbers at a time and compute their GCD and output it to the screen, <strong>stopping only when both numbers input are 0</strong>, in which case you should stop and not output anything for that pair of integers.</p>
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/conditionals/rps (author: redekopp@usc.edu) Copied from problem cpp/conditionals/taxbrackets (author: redekopp@usc.edu) Copied from problem cpp/conditionals/nestedec (author: redekopp@usc.edu) Copied from problem cpp/conditionals/extracredit (author: redekopp@usc.edu) Copied from problem cpp/control/flag (author: daveagp@gmail.com) 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 <iomanip> using namespace std; int main() { int x, y, gcd; cin >> x >> y; while( \[ ! (x == 0 && y == 0) ]\ ) { \[ while(y != 0){ int t = y; y = x % y; x = t; } gcd = x; ]\ cout << gcd << endl; \[ cin >> x >> y; ]\ } 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": "9 6 40 28 1071 462 0 0", "args": ""}, {"stdin": "4 2 8 4 16 8 32 16 64 32 128 64 256 128 512 256 1024 512 0 0", "args": ""}, {"stdin": "56 40 0 1 0 0 ", "args": ""} ]
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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