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Write a program, which uses post-test loop, to compute the sum of a

 

Write a program, which uses post-test loop, to compute the sum of a , Write a program, which uses post-test loop, to compute the sum of a

akash_9105

24 Oct, 2009 - 10:42 AM
Post #1

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Write a program, which uses post-test loop, to compute the sum of a series of numbers entered by the user. Note that the sum is displayed when the user enters the value 0, i.e. zero

Here is what i have done :

CODE

i=0
sum=0.0
x=input("Enter a number : ")

while x!=0:
    sum=x+sum
    x=input("Enter a number : ")
    i=i+1
    
    if x==0:
        print "sum is : ",sum


The code works fine but i am not being able to understand what is meant by a POST TEST LOOP . Can someone explain to me what is meant by a post test loop ?

thanx

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Tshiknn

RE: Write A Program, Which Uses Post-test Loop, To Compute The Sum Of A

24 Oct, 2009 - 07:06 PM
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A normal loop checks the conditional, then if found true, runs the code. Then it goes back to the conditional and repeats. A post-test loop is a loop that runs the code, then checks the condition, then if found true, runs the code again. The difference is that a post-test loop is always runs the code once, even if the conditional isn't true, whereas a pre-test loop doesn't run the code if the conditional isn't true. Here's the basic form for a post-test loop:

CODE
# post-test loop
while True:
    <statements>
    if not <conditional>:
        break

# pre-test loop
while <conditional>:
    <statements>


You don't often use post-test loops, but sometimes they're useful.
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akash_9105

RE: Write A Program, Which Uses Post-test Loop, To Compute The Sum Of A

24 Oct, 2009 - 08:32 PM
Post #3

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Posts: 5
Thanx for your quick response, so even though my code is working, is it a post test loop ?

Here is my code:
CODE


i=0
sum=0.0
x=input("Enter a number : ")

while x!=0:
    sum=x+sum
    x=input("Enter a number : ")
    i=i+1
  
    if x==0:
        print "sum is : ",sum







QUOTE(Tshiknn @ 24 Oct, 2009 - 07:06 PM) *

A normal loop checks the conditional, then if found true, runs the code. Then it goes back to the conditional and repeats. A post-test loop is a loop that runs the code, then checks the condition, then if found true, runs the code again. The difference is that a post-test loop is always runs the code once, even if the conditional isn't true, whereas a pre-test loop doesn't run the code if the conditional isn't true. Here's the basic form for a post-test loop:

CODE
# post-test loop
while True:
    <statements>
    if not <conditional>:
        break

# pre-test loop
while <conditional>:
    <statements>


You don't often use post-test loops, but sometimes they're useful.
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Tshiknn

RE: Write A Program, Which Uses Post-test Loop, To Compute The Sum Of A

25 Oct, 2009 - 09:11 AM
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No, not really. A post test loop would be an infinite loop that runs the code, then breaks if the conditional isn't true. A post-test loop would look like this in your program:

CODE
i=0
sum=0.0
x=input("Enter a number : ")

while True:
    sum=x+sum
    x=input("Enter a number : ")
    i=i+1
  
    if x==0:
        print "sum is : ", sum
        break
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