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Let's practice complining code using the Linux terminal from the Vocareum virtual machine web interface.
Follow these steps, then copy the output of the compiler into the box below.
<ol>
<li>Login to Vocareum and start Lab 11. Start the compilation exercise.</li>
<li>Create a new file using the "New".."File" button in the upper left and name it <tt>lab9.cpp</tt></li>
<li>Select the file in the left pane and then copy the following into the editor window</li>
<pre><code>

#include &ltiostream&gt

using namespace std;

int main()
{
int didNotNeed;
int flse = 0;
char cool = 'c';

if (cool = 'c')
cout << "This code is perfect" << endl;
if (~flse)
cout << 2/0;
return 'y';
}</code></pre></li>
<li>In the terminal window at the bottom, type <tt>ls</tt>. You should see a listing of the files in the <tt>work</tt> directory which for now is just <tt>lab9.cpp</tt></li>
<li>Compile it using the g++ command with -Wall enabled: <tt>g++ -Wall lab9.cpp</tt></li>
<li>Type <tt>ls</tt> in the terminal window again. Now you should see two files in the folder: <tt>a.out lab9.cpp</tt>. <tt>a.out</tt> is the default name given to the program the compiler creates.
This name is not very descriptive. Let's have it use a different name for the executable program.</li>
<li>Recompile the program adding the <tt>-o progname</tt> option. Type: <tt>g++ -Wall lab9.cpp -o lab9</tt>. 
Note the warnings that are generated and mark the ones that are listed as proof you were able to do this step successfully.</li>
<li>Type <tt>ls</tt> in the terminal window again. Now you should see three files in the folder: <tt>a.out lab9 lab9.cpp</tt>. <tt>lab9</tt> is now the executable program that you can execute. </li>
<li>To run the program, type <tt>./lab9</tt> at the terminal command line.</li> This program should start running but then crash with the message <tt>Floating point exception (code dumped)</tt> due to the divide by 0 error.</li>
</ol>

To summarize, the general flow of compiling and running your program is:
<ol>
<li>Write your code in an editor and save it</li>
<li>Compile your program using a line such as: <tt>g++ -Wall your-file.cpp -o exec-prog-name</tt>. Replace <tt>your-file.cpp</tt> and <tt>exec-prog-name</tt> with the name of your file and desired executable program name.</li>
<li>Run the program by typing <tt>./exec-prog-name</tt> where you replace the <tt>exec-prog-name</tt> with your program name from above.</li>
<li>If the program works as expected, you are done.</li>
<li>If the program has a problem go back to the start and change your code and go through all these steps again.</li>
</ol>
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[["warning: g++ used instead of clang; recommened recompiling with f- OS X flag [-WMacintosh]", null], ["warning: suggest parentheses around assignment used as truth value [-Wall]", null], ["warning: assignment operator used instead of equality operator? [-Wshadow]", null], ["warning: division by zero [-Wdiv-by-zero]", null], ["warning: unused variable \u2018didNotNeed\u2019 [-Wunused-variable]", null], ["warning: return type is int, but implicit cast from char is present [-Wconversion]", null], ["warning: bitwise not used on boolean type; may cause errors on systems without single-bit registers [-Wbitwise]", null], ["warning: suggest parentheses around assignment used as truth value [-Wparentheses]", null], ["warning: non-reserved keyword 'flse' used; did you mean 'false'? [-Wboolean]", null]]
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Java test suite
See manual

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

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See manual

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Property	Value
Description html markup shown to student	<p>Let's practice complining code using the Linux terminal from the Vocareum virtual machine web interface.</p> <p>Follow these steps, then copy the output of the compiler into the box below.</p> <ol> <li>Login to Vocareum and start Lab 11. Start the compilation exercise.</li> <li>Create a new file using the "New".."File" button in the upper left and name it <tt>lab9.cpp</tt></li> <li>Select the file in the left pane and then copy the following into the editor window</li> <pre><code> #include &ltiostream&gt using namespace std; int main() { int didNotNeed; int flse = 0; char cool = 'c'; if (cool = 'c') cout << "This code is perfect" << endl; if (~flse) cout << 2/0; return 'y'; }</code></pre></li> <li>In the terminal window at the bottom, type <tt>ls</tt>. You should see a listing of the files in the <tt>work</tt> directory which for now is just <tt>lab9.cpp</tt></li> <li>Compile it using the g++ command with -Wall enabled: <tt>g++ -Wall lab9.cpp</tt></li> <li>Type <tt>ls</tt> in the terminal window again. Now you should see two files in the folder: <tt>a.out lab9.cpp</tt>. <strong><tt>a.out</tt></strong> is the default name given to the program the compiler creates.</strong> This name is not very descriptive. Let's have it use a different name for the executable program.</li> <li>Recompile the program adding the <tt>-o progname</tt> option. Type: <tt>g++ -Wall lab9.cpp -o lab9</tt>.<br> <strong>Note the warnings that are generated and mark the ones that are listed as proof you were able to do this step successfully.</strong></li> <li>Type <tt>ls</tt> in the terminal window again. Now you should see three files in the folder: <tt>a.out lab9 lab9.cpp</tt>. <tt>lab9</tt> is now the executable program that you can execute. </li> <li>To run the program, type <tt>./lab9</tt> at the terminal command line.</li> This program should start running but then crash with the message <tt>Floating point exception (code dumped)</tt> due to the divide by 0 error.</li> </ol> <p> To summarize, the general flow of compiling and running your program is:</p> <ol> <li>Write your code in an editor and save it</li> <li>Compile your program using a line such as: <tt>g++ -Wall your-file.cpp -o exec-prog-name</tt>. Replace <tt>your-file.cpp</tt> and <tt>exec-prog-name</tt> with the name of your file and desired executable program name.</li> <li>Run the program by typing <tt>./exec-prog-name</tt> where you replace the <tt>exec-prog-name</tt> with your program name from above.</li> <li>If the program works as expected, you are done.</li> <li>If the program has a problem go back to the start and change your code and go through all these steps again.</li> </ol>
Epilogue html markup shown when solved	remove
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Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`	[["warning: g++ used instead of clang; recommened recompiling with f- OS X flag [-WMacintosh]", null], ["warning: suggest parentheses around assignment used as truth value [-Wall]", null], ["warning: assignment operator used instead of equality operator? [-Wshadow]", null], ["warning: division by zero [-Wdiv-by-zero]", null], ["warning: unused variable \u2018didNotNeed\u2019 [-Wunused-variable]", null], ["warning: return type is int, but implicit cast from char is present [-Wconversion]", null], ["warning: bitwise not used on boolean type; may cause errors on systems without single-bit registers [-Wbitwise]", null], ["warning: suggest parentheses around assignment used as truth value [-Wparentheses]", null], ["warning: non-reserved keyword 'flse' used; did you mean 'false'? [-Wboolean]", null]]
Correct answer
Template / Reference solution
Template / Reference solution
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 `[{}]`
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
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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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