Question

To mimic a real-world programming situation, you are given partially-completed code, written by a former employee you have just replaced. Your task is to complete the program he was developing. Fortunately, the former employee's documentation is up-to-date and quite useful Below is the incomplete section of the code, taken from the Python program which is to use Turtle to draw a grid. (In this exercise, a gridis a series of rows, and a rowis a series of boxes or squares.) To draw a grid, each box (square) is drawn starting and finishing at the top left hand corner of the box, heading east (right). A series of boxes drawn in a horizontal line from left to right form a row. Each subsequent row is drawn underneath the previous row. The number of rows to be drawn is stored in the variable: number of rows The number of boxes to be drawn in each row is stored in the variable: number of columns The existing function goto nextboxpos) takes care of repositioning the turtle to where the next box in the row is to be drawn. The existing function goto nextrow.pos) takes care of repositioning the turtle to where the next row is to be drawn Here's the incomplete code. The only missing part is a condition. You can safely assume that all of the other code your predecessor wrote is complete and correct # draw a series of rows of boxes for eachrow in range (number ofrows): draw a series of boxes in a horizontal line for each column in range (number of columns): draw grey box0 else: draw white box () gote next boxpos0 goto next row.pgs0 Complete the code so that the first column is shaded, then every second column is shaded. The image below gives an example of the shading pattern required: NB: The operator returns the remainder after integer division for each column in range (number of if (each_column % 2) if (each_column % 2) != 0 if (each_row % 2) 0 if (each_row % 2) != 0 if ((each_row each_column) % 2) != 0 go if ((each_row + each_column) % 2) - the code sO ihat the first column is shaded, then every le of the shading pattern required: 0 0

Answer 1

Answer:

if (each_column % 2) == 0

Complete code:

# draw a series of rows of boxes
for each_row in range(number_of_rows):
    # draw a series of boxes in a horizontal line
    for each_column in range(number_of_columns):
        if (each_column % 2) == 0:
            draw_grey_box()
        else:
            draw_white_box()
        goto_next_box_pos()
    goto_next_row_pos()

Explanation:-

Suppose we have number_of_columns = 6.
Then, we have to draw grey boxes in column number 0, 2 and 4.
The column numbers above are even numbers and the condition each_column % 2 == 0 checks for even numbers.

• 0 % 2 = 0
• 2 % 2 = 0
• 4 % 2 = 0