Sometimes it is convenient to break out of a while loop from within the body of the while loop itself. This is often the case when it is more sensible to test a condition in the body that is different from the while loop condition.A typical case iswhile condition_for_doing: <some_code> if condition_for_breaking: break <more_code>If condition_for_breaking is satisfied then <more_code> is skipped:>>> x = 0>>> while x < 10:... print(f"Before {x}")... if x > 1:... break... print(f"After {x}")... x = x + 1... print(f"Done {x}")Before 0After 0Before 1After 1Before 2Done 2Note that breaking in the middle of a while loop is generally considered bad programming practice because it often leads to bugs which are difficult to resolve.Breaking from at the end of a loop to simulate a do-while loop is fine.TaskWrite a program that uses a while loop to repeatedly prompt the user for numbers until the user enters nothing (empty string). Print the average of the numbers entered.You must use a break statement to exit the while loop in order to credit for this question.
Question
Sometimes it is convenient to break out of a while loop from within the body of the while loop itself. This is often the case when it is more sensible to test a condition in the body that is different from the while loop condition.A typical case iswhile condition_for_doing: <some_code> if condition_for_breaking: break <more_code>If condition_for_breaking is satisfied then <more_code> is skipped:>>> x = 0>>> while x < 10:... print(f"Before {x}")... if x > 1:... break... print(f"After {x}")... x = x + 1... print(f"Done {x}")Before 0After 0Before 1After 1Before 2Done 2Note that breaking in the middle of a while loop is generally considered bad programming practice because it often leads to bugs which are difficult to resolve.Breaking from at the end of a loop to simulate a do-while loop is fine.TaskWrite a program that uses a while loop to repeatedly prompt the user for numbers until the user enters nothing (empty string). Print the average of the numbers entered.You must use a break statement to exit the while loop in order to credit for this question.
Solution
Here is a Python program that fulfills the task:
# Initialize a variable to hold the running total
total = 0.0
# Initialize a counter variable
counter = 0
# Use a while loop to repeatedly prompt the user for numbers
while True:
# Prompt the user for a number
num = input("Enter a number (or enter nothing to stop): ")
# If the user enters nothing, break out of the loop
if num == "":
break
# Convert the input to a float and add it to the running total
total += float(num)
# Increment the counter
counter += 1
# Calculate the average
average = total / counter
# Print the average
print("The average of the numbers is", average)
This program initializes a total variable to 0.0 and a counter variable to 0. The while loop runs indefinitely until it is broken out of. Inside the loop, the program prompts the user to enter a number. If the user enters nothing, the program breaks out of the loop. Otherwise, it converts the input to a float, adds it to the total, and increments the counter. Once the loop is broken out of, the program calculates the average by dividing the total by the counter, and then prints the average.
Similar Questions
While statements provide a mechanism for repeating computations. The while statement has the form:while condition: <body_code><more_code>where condition is a boolean valued expressions and <body_code> is a sequences of statements.<body_code> is repeatedly evaluated until condition is broken (i.e. becomes false) in which case computation moves to <more_code>.When writing a while loop there are a few things to keep in mind:You will likely need to initialize one or more variables before the while statement.The condition (test) of the while statement will usually become false eventually (otherwise the loop will not terminate).The body code typically changes one or more variables in such a way that the condition will become false eventually.For example, the following code, when executed, will output a countdown. The variable count is first initialized, the condition tests if count has reached 0, and in the body of the loop count is decremented (and will eventually become 0).count = 5while count > 0: print(count) # initialize count = count - 1 # count will eventually descend to 0print("Thunderbirds are Go")TaskWrite a program that takes the average of an arbitrary number of floats. The number of floats and the floats themselves are all entered by the userDo this in the following way:Prompt the user to enter the number of floats to be entered. (This is in the starter code already.)Repeatedly prompt the user for those numbers using a while loop.Accumate the numbers into a running total and then print the average of the numbers.PreconditionsThe number of floats entered is an integer greater than zero.The subsequent floats are each greater than or equal to zero.
What is the purpose of the break statement in a for loop?To exit the loop early when a certain condition is met.to skip over a specific iteration of the loop.To continue the loop with the next iteration.None of the above.
What is the purpose of a break statement in a loop?Question 10Answera.To terminate the programb.To exit the loop entirelyc.To exit the current iteration of the loopd.To skip the remaining code in the loop and continue with the next iteration
is used to break the execution of a loop
the condition is tested at the last part of the loop. forwhiledo while
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