Which of the following Python programs implement the control flow graph shown?

(a)

while True :
   n = int(input("Enter an int:"))
   if n == A1 :
      continue
   elif n == A2 :
      break
   else :
      print ("what")
else:
   print ("ever")

(b)

while True :
   n = int(input("Enter an int:"))
   if n == A1 :
      continue
   elif n == A2 :
      break
   else :
      print ("what")
print ("ever")

(c)

while True :
   n = int(input("Enter an int:"))
   if n == A1 :
      continue
   elif n == A2 :
      break
print ("what")
print ("ever")

Find the error. Consider the following program :

a = int(input("Enter a value: ")) 
while a != 0:
   count = count + 1
   a = int(input("Enter a value: "))
print("You entered", count, "values.")

It is supposed to count the number of values entered by the user until the user enters 0 and then display the count (not including the 0). However, when the program is run, it crashes with the following error message after the first input value is read :

  Enter a value: 14
  Traceback (most recent call last):
    File "count.py", line 4, in <module> 
      count = count + 1
  NameError: name 'count' is not defined

What change should be made to this program so that it will run correctly ? Write the modification that is needed into the program above, crossing out any code that should be removed and clearly indicating where any new code should be inserted.

A store charges ₹120 per item if you buy less than 10 items. If you buy between 10 and 99 items, the cost is ₹100 per item. If you buy 100 or more items, the cost is ₹70 per item. Write a program that asks the user how many items they are buying and prints the total cost.

Write a program that reads from user — (i) an hour between 1 to 12 and (ii) number of hours ahead. The program should then print the time after those many hours, e.g.,
  Enter hour between 1-12 : 9
  How many hours ahead : 4
  Time at that time would be : 1 O'clock