CSC111 Homework 6 Solution 2014

--D. Thiebaut (talk) 09:46, 26 March 2014 (EDT)

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There were several good solution programs for Homework 6. You were not required to use a main() function, although some did. The program below is a good example of how Python programs should be organized, with a header first, possibly a few import statements, maybe a constant or two, then a long list of function definitons (def statements), then the definition of the main() function, and at the very end, one call to main() that starts the whole program.

Program 1

# Program:  hw6a.py
# Programmer: Yumeng Wang(cf)
# (slightly edited by D. Thiebaut)
# The last edited time: 03/11/2014

# The program asks the user for an input which needs
# to be an integer that is greater or equal to 0,
# and then displays a chessboard with that dimension
# while each cell of the chessboard is represented by a
# 3*3 block.

# --------------------define functions---------------------

# printElement( visibility )- shows how to print one 1*3
# element in a 3*3 block.
def printElement( visibility ):
    if visibility == True:
        print( "###", end="" )
    else:
        print( "...", end="" )

# printOneLine( visibility )- print the first line of each row
def printOneLine( dimension, visibility ):
    
    # it prints"###" and "..." one by one until
    # the number of them is equal to the dimension
    for i in range ( dimension ):
        printElement( visibility )
        visibility = not visibility
        
    # when dimension is odd, change the visibility after 
    # it prints a line so that we have the original visibility 
    # at the beginning of every new line.
    if dimension % 2 != 0:
           visibility = not visibility
    
         
# printThreeLine( visibility )- print one row by print 
# the same line three times.
def printThreeLine( dimension, visibility ):
    for i in range (3):
        printOneLine( dimension, visibility )        
        print() 
    
# printBoard( visibility)- print the whole chessboard
# by printing the required number(dimension) of rows.
def printBoard( dimension, visibility ):
    for i in range ( dimension ):
        printThreeLine ( dimension, visibility )
        visibility = not visibility


# ==================================================================  
#                                                           MAIN PROGRAM
# ==================================================================
# main()- set the visibility to be true and print the
# printBoard( visibility ) function.
def main( ):
    # get dimension from user 
    dimension = int(Input("Enter dimention of board: "))
    while dimension < 0:
        dimension = int(Input("Enter dimention of board: "))

    printBoard( dimension, True )



main()