cpp/arrays/examples/arraybad Source

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Description
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An example of unpredictable behaviour.

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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 <string>
using namespace std;

int main() {
\[

\show:
int arr[3]; // declare an array
int thirteen = 13; // never changes

cout << "Badness: reading out of bounds!" << endl;
cout << arr[3] << endl;
cout << arr[-1] << endl;

cout << "Worse: writing out of bounds!" << endl;
arr[-1] = 34;
cout << "thirteen is now: " << thirteen << endl;

cout << "Writing out of bounds. C++ prevents nothing :(" << endl;
arr[3] = 103;
cout << arr[3] << endl;

cout << "Let's crash the program!" << endl;
arr[340912983] = 78676;
cout << "This line won't execute." << endl;

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 [{}]

[
{}
]

C++ test suite
See manual

Forbidden substrings
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
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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"]

["-Wno-array-bounds"]
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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	An example of unpredictable behaviour.
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() { \[ \show: int arr[3]; // declare an array int thirteen = 13; // never changes cout << "Badness: reading out of bounds!" << endl; cout << arr[3] << endl; cout << arr[-1] << endl; cout << "Worse: writing out of bounds!" << endl; arr[-1] = 34; cout << "thirteen is now: " << thirteen << endl; cout << "Writing out of bounds. C++ prevents nothing :(" << endl; arr[3] = 103; cout << arr[3] << endl; cout << "Let's crash the program!" << endl; arr[340912983] = 78676; cout << "This line won't execute." << endl; 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 `[{}]`	[ {} ]
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"]`	["-Wno-array-bounds"] remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

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