Help me pass all tests. Do not change main.cpp and canvas.h. You can only make changes in a new canvas.cpp file.

---------------canvas.h--------------

#ifndef CANVAS_H #define CANVAS_H

#include

using namespace std;

// In this homework, you'll manipulate ASCII art images // consisting of a rectangular grid of chararacter pixels. class Canvas { public: // Allocates a canvas of the given width and height 5 that // consists entirely of ' ' (space) chars. If the width is 0, // the canvas is empty (pointer is NULL and _width is 0) Canvas(int width);

// Allocates a canvas with width 5 and height 5 that looks like: // // ### #### #### #### // # # # # # # # // ##### or #### or # or # # // # # # # # # # // # # #### #### #### // // depending upon which character ('A', 'B', 'C', or 'D') is // given as a parameter. If some other character is given, // allocates a canvas of ' ' chars with width 5 and height 5. Canvas(char x);

// Returns the width of the canvas. int width();

// Returns the entire canvas as a single string, consisting of each row // of the canvas, followed by the newline character (' '). // If the canvas is empty, returns an empty string. string to_string(); // Replaces every instance in the canvas of old_char with new_char. // For instance, if old_char is '#' and new char is '@', then: // // ### @@@ // # # @ @ // ##### becomes @@@@@ // # # @ @ // # # @ @ // void replace(char old_char, char new_char);

// Destructor. Deallocates all of the memory allocated by the canvas. ~Canvas();

// Allocates a canvas containing the sequence of characters // in the string with 2 columns of space between each pair // of adjacent characters. For instance, Canvas("BADCAB") // should yield: // // #### ### #### #### ### #### // # # # # # # # # # # # // #### ##### # # # ##### #### // # # # # # # # # # # # // #### # # #### #### # # #### // // Any characters in s not from {'A', 'B', 'C', 'D'} should be // replaced with empty 5x5 space, just like previous constructor. // If the string is empty (null string), the canvas is empty // (pointer is NULL and _width is 0) Canvas(string s);

// Adds a character to the Canvas's sequence of characters. void add(char x);

private: // A canvas is represented as a 2D char array, i.e. // an array of pointers to char (sub)arrays. // Each subarray corresponds to a COLUMN of the image. char** C; int _width; };

#endif

canvas.cpp

#include #include #include #include "canvas.h"

using namespace std;

inline void _test(const char* expression, const char* file, int line) { cerr

#define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__))

int main() {

C9.add('D'); test(C9.width() == 26); test(C9.to_string() == string(" ### #### #### #### ") + "# # # # # # # " + "##### # #### # # " + "# # # # # # # " + "# # #### #### #### "); C9.add('!'); test(C9.width() == 33); test(C9.to_string() == string(" ### #### #### #### ") + "# # # # # # # " + "##### # #### # # " + "# # # # # # # " + "# # #### #### #### "); C9.add('C'); test(C9.width() == 40); test(C9.to_string() == string(" ### #### #### #### #### ") + "# # # # # # # # " + "##### # #### # # # " + "# # # # # # # # " + "# # #### #### #### #### ");

Canvas C10(0); C10.add('A'); test(C10.width() == 5); test(C10.to_string() == string(" ### ") + "# # " + "##### " + "# # " + "# # ");

Canvas C11(""); C11.add('A'); test(C11.width() == 5); test(C11.to_string() == string(" ### ") + "# # " + "##### " + "# # " + "# # ");

// Test Canvas(string) Canvas C12("ADD"); test(C12.width() == 19); test(C12.to_string() == string(" ### #### #### ") + "# # # # # # " + "##### # # # # " + "# # # # # # " + "# # #### #### "); Canvas C13("VBAD!"); test(C13.width() == 33); test(C13.to_string() == string(" #### ### #### ") + " # # # # # # " + " #### ##### # # " + " # # # # # # " + " #### # # #### "); Canvas C14("DAD CAB"); test(C14.width() == 47); test(C14.to_string() == string("#### ### #### #### ### #### ") + "# # # # # # # # # # # " + "# # ##### # # # ##### #### " + "# # # # # # # # # # # " + "#### # # #### #### # # #### ");

cout

In this homework, you'll implement a class that represents "ASCII art" images and operations on them, represented as two-dimensional char arrays allocated on the heap (using the new operator). The following files are given to you: 1. A C++ header file (canvas.h) declaring the Canvas class. 2. A C++ source file (main.cpp) containing a main() function with tests. Create a new C++ source file named canvas.cpp that implements the class declared in canvas.h so that canvas.cpp and the provided files compile into a program that runs with no failed tests. "u\---@. + "u \- + \ ." ()[dad 7sa//