help implementing canvas.cpp but with only #include "canvas.h",

class header file doesnt have height

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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. 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); // 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. Canvas(string s); // 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 (' '). 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); // Adds a character to the Canvas's sequence of characters. void add(char x); // Destructor. Deallocates all of the memory allocated by the canvas. ~Canvas(); 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 

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main.cpp

#include  #include  #include  #include "canvas.h" using namespace std; inline void _test(const char* expression, const char* file, int line) { cerr << "test(" << expression << ") failed in file " << file; cerr << ", line " << line << "." << endl; abort(); } #define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__)) void interactive_mode(char ink) { cout << "Enter a string and press Enter "; cout << "to see the ASCII art version." << endl; while (cin) { string line; getline(cin, line); string invalid_chars; for (int i = 0; i < line.size(); ++i) if (line[i] < 'A' || line[i] > 'D') invalid_chars += line[i]; if (invalid_chars.size() > 0) { cout << " String contained invalid chars: "; for (int i = 0; i < invalid_chars.size(); ++i) { cout << "'" << invalid_chars[i] << "'"; if (i != invalid_chars.size() - 1) cout << ", "; } cout << "." << endl; } else if (line.size() > 0) { Canvas C(line); C.replace('#', ink); cout << C.to_string(); } } exit(0); } int main() { // Interactive mode. // Uncomment the "interactive_mode..." line below to // use your Canvas implementation interactively. // // The parameter specifies the character used to fill letters. // // interactive_mode('@'); // Test Canvas(int) Canvas C1(3); test(C1.width() == 3); test(C1.to_string() == string(" ") + " " + " " + " " + " "); Canvas C2(4); test(C2.width() == 4); test(C2.to_string() == string(" ") + " " + " " + " " + " "); Canvas C3(7); test(C3.width() == 7); test(C3.to_string() == string(" ") + " " + " " + " " + " "); // Test Canvas(char) Canvas C4('A'); test(C4.width() == 5); test(C4.to_string() == string(" ### ") + "# # " + "##### " + "# # " + "# # "); Canvas C5('B'); test(C5.width() == 5); test(C5.to_string() == string("#### ") + "# # " + "#### " + "# # " + "#### "); Canvas C6('C'); test(C6.width() == 5); test(C6.to_string() == string(" #### ") + "# " + "# " + "# " + " #### "); Canvas C7('D'); test(C7.width() == 5); test(C7.to_string() == string("#### ") + "# # " + "# # " + "# # " + "#### "); Canvas C8('E'); test(C8.width() == 5); test(C8.to_string() == string(" ") + " " + " " + " " + " "); // Test replace() C5.replace('#', '@'); test(C5.width() == 5); test(C5.to_string() == string("@@@@ ") + "@ @ " + "@@@@ " + "@ @ " + "@@@@ "); C5.replace(' ', '-'); test(C5.width() == 5); test(C5.to_string() == string("@@@@- ") + "@---@ " + "@@@@- " + "@---@ " + "@@@@- "); C5.replace('-', '@'); test(C5.width() == 5); test(C5.to_string() == string("@@@@@ ") + "@@@@@ " + "@@@@@ " + "@@@@@ " + "@@@@@ "); C5.replace('@', '$'); test(C5.width() == 5); test(C5.to_string() == string("$$$$$ ") + "$$$$$ " + "$$$$$ " + "$$$$$ " + "$$$$$ "); C6.replace(' ', '*'); test(C6.width() == 5); test(C6.to_string() == string("*#### ") + "#**** " + "#**** " + "#**** " + "*#### "); C7.replace('#', '*'); test(C7.width() == 5); test(C7.to_string() == string("**** ") + "* * " + "* * " + "* * " + "**** "); C8.replace('#', ' '); test(C8.width() == 5); test(C8.to_string() == string(" ") + " " + " " + " " + " "); // Test add() Canvas C9('A'); C9.add('C'); test(C9.width() == 12); test(C9.to_string() == string(" ### #### ") + "# # # " + "##### # " + "# # # " + "# # #### "); C9.add('B'); test(C9.width() == 19); test(C9.to_string() == string(" ### #### #### ") + "# # # # # " + "##### # #### " + "# # # # # " + "# # #### #### "); 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(" ### #### #### #### #### ") + "# # # # # # # # " + "##### # #### # # # " + "# # # # # # # # " + "# # #### #### #### #### "); // Test Canvas(string) Canvas C10("ADD"); test(C10.width() == 19); test(C10.to_string() == string(" ### #### #### ") + "# # # # # # " + "##### # # # # " + "# # # # # # " + "# # #### #### "); Canvas C11("VBAD!"); test(C11.width() == 33); test(C11.to_string() == string(" #### ### #### ") + " # # # # # # " + " #### ##### # # " + " # # # # # # " + " #### # # #### "); Canvas C12("DAD CAB"); test(C12.width() == 47); test(C12.to_string() == string("#### ### #### #### ### #### ") + "# # # # # # # # # # # " + "# # ##### # # # ##### #### " + "# # # # # # # # # # # " + "#### # # #### #### # # #### "); cout << "Assignment complete." << endl; } -----------------------------------------------------------------------