Question

Consider the following code segment:
   count = 1
   while count <= 10:
      print(count, end=" ")
Which of the following describes the error in this code?

		The loop control variable is not properly initialized.
		The comparison points the wrong way.
		The loop is infinite.
		The loop is off by 1.

Does this code contain an error? If so, what line is the error on?

0: ans = input("Yes/No? ")
1: if ans == "Yes":
2: print("Confirmed!")
3: else
4: print("Not Confirmed!")

		line 2
		line 3
		line 1
		No error, this code is fine.

What is the output of the following code:

x = 10
  while(x>0):
      print(x-1)

		9,9,9,...(forever)
		9,8,7,6,5,4,3,2,1
		10,9,8,7,6,5,4,3,2,1,0
		9,8,7,6,5,4,3,2,1,0

In Python, how do you know that you have reached the end of the if-statement block?

		A comment #
		}
		The code is less indented than the previous line
		;

Answer 1

ANSWER FIRST QUESTION:-

count = 1
while count<=10:
    print(count,end=" ")

So the error in the above code is that it is an infinite loop.

What is an infinite loop?

In simple words, it is a non- terminating loop. So the statements inside the loop will keep on executing endlessly. In the above example, it will keep printing 1 on the output window. This is because the loop will keep on executing until the value of the loop is less than equal to 10. And here count is 1 and there is nothing inside the loop that is changing its value.

ANSWER SECOND QUESTION:-

0: ans = input("Yes/No? ")
1: if ans == "Yes":
2: print("Confirmed!")
3: else
4: print("Not Confirmed!")

In the above code, the error is in the third line. There is a syntax error here. unlike other programming languages like C, C++, and Java the if-else statement ends with a :(colon) in python.

So the correct code will look like this:-

ans=input("Yes/No?")
if ans=="Yes":
    print ("Confirmed")
else: #This is the error that was fixed
    print ("Not confirmed")

ANSWER TO THE THIRD QUESTION:-

x = 10
while(x>0):
    print(x-1)

It will print 9,9,9,9,9,9(Forever). Again, it is a case of an infinite loop. and x is 10 and the statement inside while i.e

print(x-1) will keep on printing 9 forever because the value of x will always remain greater than 0 as we don't have any update statement or expression inside the loop to change its value.

In Python, how do you know that you have reached the end of the if-statement block?

ANSWER- Unlike languages like C, C++, and Java Python works on indentation. So the end of the if-else will be determined by its indentation.

E.g:-

x = 5
if(x==5):
    print "Hi, I am five"
    print "Have a nice day" #end of if
x=x+1
    

So, here the indentation of the if is

print "Hi, I am five"
print "Have a nice day"

That means it will end after these lines.

The line x=x+1 is not a part of if block.

HAPPY LEARNING