Question

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Given the following vector variable containing a 4x4 tic-tac-toe board // This is another way to fill-in a 2D vector vector«vector<char» board : { { ', 'X', .0', ' . }, Write the type and value of the following expressions: . board.size) . board.at(0).size() . board.at(8).at(1) . board.front() Using .at, write an assignment statement that will cause the 'O' player to win, and another assign- ment statement that will cause the 'X' player to win.

Answer 1

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Write the type and value of the following expressions

board.size()

type: size_t (unsigned integer)

value: 4 (number of rows or vectors in board)

board.at(0).size()

type: size_t (unsigned integer)

value: 4 (number of elements in vector at index 0 of board)

board.at(0).at(1)

type: char

value: X (element at row 0, column 1)

board.front()

type: reference (returns the first element on board vector, which is a vector itself), so we can say that the return type is of vector type

Using at(), write an assignment statement that will cause the ‘O’ player to win.

board.at(0).at(3)='O';

This will assign O to the cell at row 0, column 3, which will make the entire column 3 full of ‘O’s

Using at(), write an assignment statement that will cause the ‘X’ player to win.

board.at(2).at(1)='X';

This will assign X to the cell at row 2, column 1, which will make the entire column 1 full of ‘X’s