cpp/cs104/copyassign/intarray

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Description
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Examine the code below, run it, and see what errors might be present.
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Choices
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e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

Template / Reference solution

#include <iostream>
using namespace std;

class MyArray
{
public:
MyArray() { dat = NULL; len = 0; }
MyArray(int d[], int num); //normal
int& operator[](int loc) { return dat[loc]; }
int const & operator[](int loc) const { return dat[loc]; }
int size() const { return len; }
private:
int len; int *dat;

};

// Normal constructor
MyArray::MyArray(int d[], int num)
{
dat = new int[num]; len = num;
for(int i=0; i < len; i++){
dat[i] = d[i];
}
}

void printVals(MyArray arr)
{
for(int i=0; i < arr.size(); i++){
cout << arr[i] << " ";
}
cout << endl;
}

int main()
{
int vals[] = {9,3,7,5};
MyArray a1(vals,4);
MyArray a2(a1); // calls default copy
MyArray a3 = a1; // calls default copy
MyArray a4;
a4 = a1; // calls default assignment

// how are the contents of a2, a3, a4
// related to a1
printVals(a1);
a1[0] = 11;
printVals(a2);

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

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["-Wno-unused-variable"]
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see default_cppflags
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Property	Value
Description html markup shown to student	Examine the code below, run it, and see what errors might be present.
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> using namespace std; class MyArray { public: MyArray() { dat = NULL; len = 0; } MyArray(int d[], int num); //normal int& operator[](int loc) { return dat[loc]; } int const & operator[](int loc) const { return dat[loc]; } int size() const { return len; } private: int len; int *dat; }; // Normal constructor MyArray::MyArray(int d[], int num) { dat = new int[num]; len = num; for(int i=0; i < len; i++){ dat[i] = d[i]; } } void printVals(MyArray arr) { for(int i=0; i < arr.size(); i++){ cout << arr[i] << " "; } cout << endl; } int main() { int vals[] = {9,3,7,5}; MyArray a1(vals,4); MyArray a2(a1); // calls default copy MyArray a3 = a1; // calls default copy MyArray a4; a4 = a1; // calls default assignment // how are the contents of a2, a3, a4 // related to a1 printVals(a1); a1[0] = 11; printVals(a2); 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-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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