v0.40: Create exercises. Challenge the community.

coord_pair

Your mission

Implement coord_pair, a compact C++98 class for a pair of integer coordinates.

See it in action

std::cout << (coord_pair(3, -2) + coord_pair(4, 5)) << "\n";

Expected result

{7, 3}

Your checklist

For your own tracking. Tests grade your code.

Create coord_pair.hpp and coord_pair.cpp.
Expose a class named coord_pair with canonical construction, copy, assignment, and destruction.
A default-constructed value is {0, 0}.
A value can be constructed from two int coordinates.
Support operator[] for indexes 0 and 1; both const and mutable access are required.
Support unary minus, +, -, * by an integer scalar on either side, and the corresponding +=, -=, *= operators.
Support prefix and postfix ++ and --; they apply to both coordinates.
Support == and !=.
Print values with operator<< as {x, y}.

More examples

std::cout << (2 * coord_pair(-1, 6)) << "\n";

Expected result

{-2, 12}

Constraints

Expected files

coord_pair.hppcoord_pair.cpp

Allowed functions

None. Write every helper yourself.

Allowed headers

iostreamstream output

coord_pair

Your mission

Implement coord_pair, a compact C++98 class for a pair of integer coordinates.

See it in action

std::cout << (coord_pair(3, -2) + coord_pair(4, 5)) << "\n";

Expected result

{7, 3}

Your checklist

For your own tracking. Tests grade your code.

Create coord_pair.hpp and coord_pair.cpp.
Expose a class named coord_pair with canonical construction, copy, assignment, and destruction.
A default-constructed value is {0, 0}.
A value can be constructed from two int coordinates.
Support operator[] for indexes 0 and 1; both const and mutable access are required.
Support unary minus, +, -, * by an integer scalar on either side, and the corresponding +=, -=, *= operators.
Support prefix and postfix ++ and --; they apply to both coordinates.
Support == and !=.
Print values with operator<< as {x, y}.

More examples

std::cout << (2 * coord_pair(-1, 6)) << "\n";

Expected result

{-2, 12}

Constraints

Expected files

coord_pair.hppcoord_pair.cpp

Allowed functions

None. Write every helper yourself.

Allowed headers

iostreamstream output

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01Default constructor yields {0, 0}Waiting

02Constructs from two coordinatesWaiting

03Copy constructor duplicates the valueWaiting

04Assignment copies both coordinatesWaiting

05const operator[] reads each coordinateWaiting

06mutable operator[] writes each coordinateWaiting

07operator+ adds component-wiseWaiting

08operator- subtracts component-wiseWaiting

09unary operator- negates both coordinatesWaiting

10operator* scales when pair is on the left (pair * int)Waiting

11operator* scales when scalar is on the left (int * pair)Waiting

12operator+= adds in placeWaiting

13operator-= subtracts in placeWaiting

14operator*= scales in placeWaiting

15prefix ++ returns the incremented pairWaiting

16postfix ++ returns the old value, then incrementsWaiting

17prefix -- returns the decremented pairWaiting

18postfix -- returns the old value, then decrementsWaiting

19operator== is true for identical pairsWaiting

20operator== is false when a coordinate differsWaiting

21operator!= is true when a coordinate differsWaiting

22operator!= is false for identical pairsWaiting

coord_pair

Your mission

Implement coord_pair, a compact C++98 class for a pair of integer coordinates.

See it in action

std::cout << (coord_pair(3, -2) + coord_pair(4, 5)) << "\n";

Expected result

{7, 3}

Your checklist

For your own tracking. Tests grade your code.

Create coord_pair.hpp and coord_pair.cpp.
Expose a class named coord_pair with canonical construction, copy, assignment, and destruction.
A default-constructed value is {0, 0}.
A value can be constructed from two int coordinates.
Support operator[] for indexes 0 and 1; both const and mutable access are required.
Support unary minus, +, -, * by an integer scalar on either side, and the corresponding +=, -=, *= operators.
Support prefix and postfix ++ and --; they apply to both coordinates.
Support == and !=.
Print values with operator<< as {x, y}.

More examples

std::cout << (2 * coord_pair(-1, 6)) << "\n";

Expected result

{-2, 12}

Constraints

Expected files

coord_pair.hppcoord_pair.cpp

Allowed functions

None. Write every helper yourself.

Allowed headers

iostreamstream output

v0.40: Create exercises. Challenge the community.

Meet Studio →

coord_pair

Your mission

Implement coord_pair, a compact C++98 class for a pair of integer coordinates.

See it in action

std::cout << (coord_pair(3, -2) + coord_pair(4, 5)) << "\n";

Expected result

{7, 3}

Your checklist

For your own tracking. Tests grade your code.

Create coord_pair.hpp and coord_pair.cpp.
Expose a class named coord_pair with canonical construction, copy, assignment, and destruction.
A default-constructed value is {0, 0}.
A value can be constructed from two int coordinates.
Support operator[] for indexes 0 and 1; both const and mutable access are required.
Support unary minus, +, -, * by an integer scalar on either side, and the corresponding +=, -=, *= operators.
Support prefix and postfix ++ and --; they apply to both coordinates.
Support == and !=.
Print values with operator<< as {x, y}.

More examples

std::cout << (2 * coord_pair(-1, 6)) << "\n";

Expected result

{-2, 12}

Constraints

Expected files

coord_pair.hppcoord_pair.cpp

Allowed functions

None. Write every helper yourself.

Allowed headers

iostreamstream output

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01Default constructor yields {0, 0}Waiting

02Constructs from two coordinatesWaiting

03Copy constructor duplicates the valueWaiting

04Assignment copies both coordinatesWaiting

05const operator[] reads each coordinateWaiting

06mutable operator[] writes each coordinateWaiting

07operator+ adds component-wiseWaiting

08operator- subtracts component-wiseWaiting

09unary operator- negates both coordinatesWaiting

10operator* scales when pair is on the left (pair * int)Waiting

11operator* scales when scalar is on the left (int * pair)Waiting

12operator+= adds in placeWaiting

13operator-= subtracts in placeWaiting

14operator*= scales in placeWaiting

15prefix ++ returns the incremented pairWaiting

16postfix ++ returns the old value, then incrementsWaiting

17prefix -- returns the decremented pairWaiting

18postfix -- returns the old value, then decrementsWaiting

19operator== is true for identical pairsWaiting

20operator== is false when a coordinate differsWaiting

21operator!= is true when a coordinate differsWaiting

22operator!= is false for identical pairsWaiting