A program should continue accepting input numbers, adding each to a sum, until a 0 is input. Which control structure should be used?
A. If statement
B. While loop
C. Multiple if statements
D. For loop
Answer (2)
The program needs to repeatedly accept input and add it to a sum until the input is 0.
An if statement executes a block of code only once, which is not suitable for repeated execution.
A for loop executes a block of code a fixed number of times or iterates through a sequence, which is not ideal when the number of iterations is unknown.
A while loop executes a block of code repeatedly as long as a condition is true, making it the most suitable control structure. The answer is While loop.
Explanation
Understanding the Problem The problem states that a program should continuously accept numbers as input, adding each to a running sum, until the user inputs the number 0. We need to determine which control structure is best suited for this task.
Analyzing Control Structures Let's consider each of the options:
If statement: An if statement executes a block of code only once if a certain condition is true. This is not suitable for repeated execution.
While loop: A while loop executes a block of code repeatedly as long as a condition remains true. This seems like a good fit since we want to keep accepting input until the input is 0.
Multiple if statements: Using multiple if statements might handle different conditions, but it doesn't inherently provide repeated execution like a loop.
For loop: A for loop executes a block of code a fixed number of times or iterates through a sequence. This isn't ideal because we don't know in advance how many numbers the user will input.
Selecting the Correct Control Structure Based on the analysis, the while loop is the most appropriate control structure because it allows the program to repeatedly accept input and add it to the sum until the input is 0.
Final Answer Therefore, the correct answer is the while loop.
Examples
Imagine you're building a simple calculator that adds numbers until the user enters 0 to get the total. A while loop is perfect for this because it keeps adding numbers as long as the input isn't 0. This is similar to how many real-world applications work, like processing transactions until a customer checks out or monitoring sensor data until a critical threshold is reached. Understanding how to use loops effectively is essential for creating programs that respond dynamically to user input or changing conditions.
The correct control structure to use for continuously accepting input until a 0 is entered is the while loop . This loop allows repeated execution as long as a condition is true, making it ideal for this scenario. Thus, the chosen option is B: While loop.
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