""" Purpose: stepping stone to nested looping
"""
# nested looping: loops inside of loops
# why do we use them? allows us to access individual cells

# get number of rows and columns
reply = input( "Number of rows and columns: " )

srows, scols = reply.split()
nrows = int( srows ) # can't use int() on multiple things at once!
ncols = int( scols )

print() # since we haven't messed with end= yet, this will print a blank line
# since the output cursor is already on a newline and move output to a newline

# produce nrows rows of output
#    for each row produce ncols columns of output
#           row r"s c-th output, is value of r + c

for r in range( 0, nrows ) : # since we want r and c to be numbers, we loop through range() s
    print("row", r, ":", end=" ") # range( 0, n ) will go from 0 to n-1
    # i added an end= to this print() statement because pretty output makes me happy :)
    total = 0
    for c in range( 0, ncols ) :
        # determine cell value for column c
        cell = r + c
        # r and c are integers, so when we add them together we get another integer
        # the first run of the outer for loop, r = 0 for each row so cell = c
        # the second run                       r = 1 so each cell = c + 1
        #     third                            r = 2         cell = c + 2

        # total = total + cell
        # if we wanted to report the total for the row, we would do it in the
        # empty print() outside of this nested loop but still in the outer row loop

        # print cell value
        print( cell, end="\t" ) # separates values with a tab ( = 5 spaces )

    # how do we start a new row after printing each column?
    print() # sends subsequent output to a newline
    # this print() is at this level of indentation because we want to go to a new line
    # once we've processed the entire row, not after every cell

    # print() says print nothing and move output to a newline because
    # there is an invisible end="\n" in every print() statement
    # end= in a print statement dictates where the next output will go
    # empty print() will print nothing and move the cursor for output to a newline

# this will be incredibly relevant to a homework assignment

# remember all of my in-class notes are available under the meetings tab on the website