Help with 4.28 LAB*: Program: Drawing a half arrow C++

Question

Write a program that outputs a downwards facing arrow composed of a rectangle and a right triangle. Arrow dimensions are defined by user specified arrow base height, arrow base width, and arrow head width. Input the arrow base height (int) and width (int). Draw a rectangle using asterisks (height x width). Hint: use a nested loop in which the inner loop draws one row of *s, and the outer loop iterates a number of times equal to the height. Submit for grading to confirm two tests pass.

Ex: If input is:

6 4

Sample output is:

****

****

****

****

****

****

Step 2 (3 pts). Input the arrow head width and draw a right triangle. Hint: use a nested loop. Submit for grading to confirm four tests pass.

Ex: If input is:

4 3 4

Sample output is:

***

***

***

***

****

***

**

*

Step 3 (4 pts). Modify the program to only accept an arrow head width that is larger than the arrow base width. Use a loop to continue inputting the arrow head width until the value is larger than the arrow base width. Submit for grading to confirm all tests pass.

Ex: If input is:

4 3 3 2 4

Sample output is:

***

***

***

***

****

***

**

*

This is my code:

#include <iostream>

using namespace std;

int main() {

int arrowBaseHeight = 0;

int arrowBaseWidth = 0;

int arrowHeadWidth = 0;

int i = 0;

int j = 0;

int x = 0;

int y = 0;

cin >> arrowBaseHeight;

cin >> arrowBaseWidth;

cin >> arrowHeadWidth;

for (i = 0; i <= arrowBaseHeight; i++){

for (j = 0; j < arrowBaseWidth; j++){

cout << "*";

}

cout << endl;

}

for (x = arrowHeadWidth; x > 0; x--){

for (y = 0; y < x; y++){

cout << "*";

}

cout << endl;

}

return 0;

}

Answer 1

You did not state your question, but I assume that you are looking for your bug.

The symptom of the bug is that your program prints one more row of stars that what is specified by

arrowBaseHeight.

The cause is the loop over i, counting the number of rows.

Notice that the loop over j, counting the number of collums, is correct.

In contrast, the loop over i using the test i <= arrowBaseHeight instead of i < arrowBaseHeight.