''' Purpose: another take on nested loops
'''

rows = 4
cols = 3

# We are printing 3 rows and 4 columns.

# ---------- SIMPLE SINGLE FOR LOOP --------------------

for r in range( 0, rows ) :
    print( r )

# This for loop will simply go from range (0,4) values 0,1,2,3 and print r one by one as it changes value with
# each iteration of the loop.

print()
print()

# -------------- NESTED FOR LOOP ------------------------

for r in range( 0, rows ) :
    print( r )
    for c in range( 0, cols ) :
        print( "    ", r, c )

# This is a nested for loop! For each r value, it will do do everything indented into that for loop. So what does that mean?
# For each r we have to print r and finish the c loop inside before moving onto the next r value!
# So this means that for each r value, we are going to print the r value
# and then print everything else in that c loop before it changes to the next r value.
# Ask me how this works later in office hours if you're still confused!

print()
print()

# -------------- NESTED FOR LOOP PT. 2 -----------------------
for r in range( 0, rows ) :
    print( r )
    for c in range( 0, cols ) :
        sum = r + c
        print( "    ", r, c, sum )

# This is also a nested for loop which will go through each row and print out r and then do the c loop before moving back up to the next r value.
# So for this for loop, it basically looks like the last one but it prints out the sum of r and c in each line for each r as well.

print()
print()

# ---------------- NESTED FOR LOOP PT. 3 ------------------------

for r in range( 0, rows ) :
    for c in range( 0, cols ) :
        sum = r + c
        print( sum, end=" " )
    print()

# This final loop just prints out all the sums for r + c for the r we are currently on on the same line and moves onto the next r value.
print()
print()