Checkpoints

#5.1
At point A, count<100 is always true.
At point B, count<100 is sometimes true.
At point C, count<100 is always false.

#5.2
guess may be equal to number, so the while loop is never executed.

#5.3
(a) Infinite loop, no printout
(b) Infinite loop, no printout
(c) 9 times, 2,4,6,8

#5.4
(a) count variable is not incremented, infinite loop.
(b) count variable is decremented instead of increment, infinite loop.
(c) count+=1 must be indented inside the loop.

#5.5
max is 5
number 0

#5.6
sum is 14
count is 4

#5.7
Yes. The advantages of for loops are simplicity and readability.
Compilers can produce more efficient code for the for loop than for the corresponding while loop

#5.8
sum = 0
i= 0
while i <= 1000:
    sum += i
    i += 1

#5.9
Not possible for all cases. For example, you cannot convert the while loop in Listing 5.3, GuessNumber.py, to a for loop.
sum = 0
for i in range(1, 10000):
    if sum < 10000:
        sum = sum + i

#5.10
(a) n-1
(b) n-1
(c) n-5
(d) The ceiling of (n-5)/3

#5.11
(a) 0 0 1 0 1 2 0 1 2 3
(b)
****
****
2 ****
3 2 ****
4 3 2 ****
(c)
1xxx2xxx4xxx8xxx16xxx
1xxx2xxx4xxx8xxx
1xxx2xxx4xxx
1xxx2xxx
1xxx
(d)
1G
1G3G
1G3G5G
1G3G5G7G
1G3G5G7G9G

#5.12
It may give floating point number, for example if n1 = 3 and n2 = 1

#5.13
The keyword break is used to exit the current loop. The program in (A) will terminate. The output is Balance is 1.

The keyword continue causes the rest of the loop body to be skipped for
the current iteration. The while loop will not terminate in (B).

#5.14
If a continue statement is executed inside a for loop,
the rest of the iteration is skipped, then the action-after-each-iteration
is performed and the loop-continuation-condition is checked.
If a continue statement is executed inside a while loop,
the rest of the iteration is skipped, then the loop-continuation-condition is checked.

fix:

    i = 0

    while i < 4:
        if i % 3 == 0:
         	  i += 1
        	  continue
        sum += i
        i += 1

#5.15
TestBreak:
   sum = 0
   number = 0

   while number < 20 and sum < 100:
       number += 1
       sum += number

   print("The number is " + str(number))
   print("The sum is " + str(sum))

TestContinue:

  sum = 0
  number = 0

  while (number < 20):
      number += 1
  if (number != 10 and number != 11):
          sum += number

  print("The sum is " + str(sum))


#5.16
(a) print(i)
    1
    2
    1
    2
    2
    3
(b)for j in range (1,4):
    1
    2
    1
    2
    2
    3