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Questions and Answers
In Python, what is the primary purpose of the command number = int(number) within a loop that accumulates a total from user inputs?
In Python, what is the primary purpose of the command number = int(number) within a loop that accumulates a total from user inputs?
- It checks if the number is within a specific range, and if not, prompts the user to re-enter a valid number.
- It formats the number to two decimal places for better readability in the output.
- It converts the user's input from a string to an integer, allowing it to be used in numerical calculations. (correct)
- It automatically assigns a unique identifier to each number entered, useful for tracking purposes.
Which of the following code snippets correctly implements a counter loop in Python that iterates 15 times, printing the square of the loop counter i in each iteration?
Which of the following code snippets correctly implements a counter loop in Python that iterates 15 times, printing the square of the loop counter i in each iteration?
- `for i <= 15: print(i*i)`
- `loop i in range(15): display(i^2)`
- `for i in range(15): print(i**2)` (correct)
- `while i < 15: print(i*i) i += 1`
In the context of accumulating a total from user inputs within a loop, which of the following Python statements is the most efficient and correct way to add the new input number to the running total?
In the context of accumulating a total from user inputs within a loop, which of the following Python statements is the most efficient and correct way to add the new input number to the running total?
- `number = total + number`
- `total = number + total`
- `total += number` (correct)
- `total = total.append(number)`
If a programmer wants to modify a Python program that currently adds 10 user-inputted numbers to instead add a variable number of inputs determined by the user at the start of the program, what is the most appropriate modification?
If a programmer wants to modify a Python program that currently adds 10 user-inputted numbers to instead add a variable number of inputs determined by the user at the start of the program, what is the most appropriate modification?
A programmer is tasked with creating a Python program that continuously takes integer inputs from a user until the cumulative total exceeds 100. Which loop structure is most suitable for this task, and what condition should control its termination?
A programmer is tasked with creating a Python program that continuously takes integer inputs from a user until the cumulative total exceeds 100. Which loop structure is most suitable for this task, and what condition should control its termination?
Flashcards
Loop (in programming)
Loop (in programming)
A control structure that repeats a sequence of instructions multiple times.
Counter Loop (Fixed Loop)
Counter Loop (Fixed Loop)
A loop that repeats a specific number of times.
Conditional Loop
Conditional Loop
A loop that continues as long as a certain condition is true.
Total (accumulator variable)
Total (accumulator variable)
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int() function in Python
int() function in Python
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Study Notes
- Most programming languages let you put commands inside a loop, which will repeat those commands many times.
- Scratch uses a 'forever' loop, which repeats commands indefinitely until the program is stopped.
- Most programming languages use loops with an exit condition to stop.
- There are two main types of loops: counter loops and conditional loops.
Counter Loops
- Repeats a set number of times, then stops.
- In Python, a counter loop is called a "for" loop.
- Using
for i in range(10):creates a loop that repeats 10 times. - The letter "i" is commonly used as a counter, but any name can be used.
- The number inside the parentheses determines how many times the loop repeats.
Scratch and Python Example
- A Scratch program can ask the user to input two numbers and output the result of adding them together.
- You can preform the same operation in Python.
Increasing Variable Value
- It is common to add to a previous total with each loop repetition.
- A variable named 'total' needs to be made.
- A Scratch program can set 'total' to 0, then increase it by 1, or by a user-inputted number.
Plan to Add a Total Program
- Set the total to 0 at the start.
- Loop 10 times.
- Input a value.
- Add the input value to the total.
- Output the total at the end.
Increasing a Variable in Python
- You can increase a variable in Python to the same effect as in Scratch.
- Start by setting "total" to 0.
- Increase the value of "total" by 1 with
total = total + 1. - You can also increase "total" by a user-inputted number.
- User inputs needs to be converted to a number value before calculation using
number = int(number).
Python Program to Add a Total
- Here is a summary of the plan
- Set total = 0
- Command to loop 10 times
for i in range (10): - Input a number using
number = input("enter a number") - Convert to number using
number = int(number) - The total = total number to increment
- Finally, print (total)
- Python requires indenting commands inside the loop.
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