cpp/cs104/copyassign/intarray

Viewing cpp/cs104/copyassign/intarray_assign by redekopp@usc.edu. You have unsaved changes. Log in above to create, edit, preview and publish Websheets.

Property Value

Description
html markup
shown to student

Add the assignment operator to your class.
Epilogue
html markup
shown when solved

remove
Public permissions remove
Remarks
Comments, history, license, etc.

Copied from problem cpp/cs104/copyassign/intarray_copycon (author: redekopp@usc.edu)
Copied from problem cpp/cs104/copyassign/intarray_destructor (author: redekopp@usc.edu)
Copied from problem cpp/cs104/copyassign/intarray1 (author: redekopp@usc.edu)

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() { cout << "In default constructor" << endl;
dat = NULL; len = 0; }
MyArray(int d[], int num); //normal
MyArray(const MyArray& other); // copy constructor
\[
REDACTED
]\
~MyArray();
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)
{
cout << "In normal constructor" << endl;
dat = new int[num]; len = num;
for(int i=0; i < len; i++){
dat[i] = d[i];
}
}

// Copy Constructor
MyArray::MyArray(const MyArray& other)
{
cout << "In copy constructor" << endl;
len = other.len;
dat = new int[len];
for(int i=0; i < len; i++){
dat[i] = other.dat[i];
}
}

// Assignment operator
\[ REDACTED ]\
{
cout << "In assignment operator" << endl;
\[
REDACTED
]\
}

MyArray::~MyArray()
{
cout << "In destructor" << endl;
delete [] dat;
}

void printVals(const 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);
MyArray a3 = a1;
MyArray a4;

a1[0] = 11;
a4 = a2 = a1; // a4.operator=( a2.operator=(a1) )
printVals(a4);
a4[0] = 15;
printVals(a4);

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

Property	Value
Description html markup shown to student	Add the assignment operator to your class.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/cs104/copyassign/intarray_copycon (author: redekopp@usc.edu) Copied from problem cpp/cs104/copyassign/intarray_destructor (author: redekopp@usc.edu) Copied from problem cpp/cs104/copyassign/intarray1 (author: redekopp@usc.edu) 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() { cout << "In default constructor" << endl; dat = NULL; len = 0; } MyArray(int d[], int num); //normal MyArray(const MyArray& other); // copy constructor \[ REDACTED ]\ ~MyArray(); 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) { cout << "In normal constructor" << endl; dat = new int[num]; len = num; for(int i=0; i < len; i++){ dat[i] = d[i]; } } // Copy Constructor MyArray::MyArray(const MyArray& other) { cout << "In copy constructor" << endl; len = other.len; dat = new int[len]; for(int i=0; i < len; i++){ dat[i] = other.dat[i]; } } // Assignment operator \[ REDACTED ]\ { cout << "In assignment operator" << endl; \[ REDACTED ]\ } MyArray::~MyArray() { cout << "In destructor" << endl; delete [] dat; } void printVals(const 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); MyArray a3 = a1; MyArray a4; a1[0] = 11; a4 = a2 = a1; // a4.operator=( a2.operator=(a1) ) printVals(a4); a4[0] = 15; printVals(a4); 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

Optional properties:

Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.