Chapter 4: Problem 13

Write a for loop that repeats seven times, asking the user to enter a number. The loop should also calculate the sum of the numbers entered.

Short Answer

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Question: Create a for loop that repeats seven times, asks the user to enter a number in each iteration, and calculates the sum of the entered numbers.

Step by step solution

Initialize variables

First, we need to initialize two variables outside the loop: one for the sum (initially set to 0) and another for the user input (which will be updated at each iteration).

Write the for loop

Now, we write a for loop that repeats seven times. This can be done using a "range" function, which returns a sequence of numbers, from 0 to 6, that will drive the loop.

Ask the user for input

Inside the loop, we use the "input" function to prompt the user to enter a number. The function returns a string that needs to be converted to a numerical value using the "float" or "int" function (depending on whether we want to allow decimal numbers or not).

Update the sum

After converting the user input to a numerical value, we add it to the sum variable. This process will be repeated in each iteration of the loop, making the sum variable store the cumulative sum of all entered numbers.

Print the final sum

Finally, after the loop has finished all its iterations, we print the final sum of the entered numbers to inform the user of the result. Here's the full code for the exercise: ```python # Step 1: Initialize variables sum_of_numbers = 0 # Step 2: Write the for loop for i in range(7): # Step 3: Ask the user for input number = float(input("Enter a number: ")) # Step 4: Update the sum sum_of_numbers += number # Step 5: Print the final sum print("The sum of the entered numbers is:", sum_of_numbers) ```

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Write a for loop that repeats seven times, asking the user to enter a number. The loop should also calculate the sum of the numbers entered.

Short Answer

Step by step solution

Initialize variables

Write the for loop

Ask the user for input

Update the sum

Print the final sum

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