- A The while loop guarantees at least one execution
- B The do-while loop guarantees at least one execution
- C The while loop checks the condition after the loop
- D Both loops are exactly the same
Do-While Loop in Programming Language - Quiz
- A The while loop guarantees at least one execution
- B The do-while loop guarantees at least one execution
- C The while loop checks the condition after the loop
- D Both loops are exactly the same
- A C++
- B Java
- C Python
- D C#
- A A loop that always executes at least once before checking the condition
- B A loop that never executes if the condition is false
- C A loop that checks the condition before every iteration
- D A loop that only runs if the condition is true
- A The loop will execute once and stop
- B The loop will throw an error
- C The loop will run infinitely
- D The loop will terminate after one iteration
- A Looping over an array with a known size
- B Repeatedly prompting user input until a valid response is given
- C Iterating over elements in a list
- D Looping through numbers from 1 to 10
- A break
- B continue
- C exit()
- D return
- A Before the loop executes
- B After each iteration
- C At the end of the program
- D In the middle of the loop body
- A The loop executes once
- B The loop does not execute at all
- C The loop runs indefinitely
- D The loop throws an error
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Do-While Loop in Programming Language - Quiz
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- A. The while loop guarantees at least one execution
- B. The do-while loop guarantees at least one execution
- C. The while loop checks the condition after the loop
- D. Both loops are exactly the same
Remarks:
Explanation:
The fundamental difference between a while loop and a do-while loop is the placement of the condition check. In a while loop, the condition is checked before executing the loop body, so the body may not execute if the condition is false initially. In contrast, in a do-while loop, the condition is checked after the loop body, meaning the loop body will execute at least once, even if the condition is false from the start. This is a crucial feature when you want the loop to run at least once regardless of the condition's initial value, like asking for user input or prompting an action that must occur at least once.
- A. The while loop guarantees at least one execution
- B. The do-while loop guarantees at least one execution
- C. The while loop checks the condition after the loop
- D. Both loops are exactly the same
Remarks:
Explanation:
The fundamental difference between a while loop and a do-while loop is the placement of the condition check. In a while loop, the condition is checked before executing the loop body, so the body may not execute if the condition is false initially. In contrast, in a do-while loop, the condition is checked after the loop body, meaning the loop body will execute at least once, even if the condition is false from the start. This is a crucial feature when you want the loop to run at least once regardless of the condition's initial value, like asking for user input or prompting an action that must occur at least once.
- A. C++
- B. Java
- C. Python
- D. C#
Remarks:
Explanation:
Python does not natively support the do-while loop construct. While C++, Java, and C# all include do-while loops as part of their syntax, Python relies solely on the while loop for its looping structures. In Python, you can simulate a do-while loop by using a while True loop with a break condition inside, but there is no formal syntax for it. This is because Python tends to favor simpler control structures, and the designers opted not to include a separate do-while loop.
- A. 4
- B. 5
- C. 6
- D. Infinite
Remarks:
Explanation:
The loop will execute 5 times. Initially, the value of i is 0, and since it is a do-while loop, the loop body executes first, printing i and then incrementing it. After each iteration, the condition i < 5 is checked. The loop will run as long as the condition is true, so the loop runs when i is 0, 1, 2, 3, and 4. When i becomes 5, the condition is false, and the loop terminates.
- A. A loop that always executes at least once before checking the condition
- B. A loop that never executes if the condition is false
- C. A loop that checks the condition before every iteration
- D. A loop that only runs if the condition is true
Remarks:
Explanation:
The do-while loop is designed to execute the loop body at least once, regardless of the condition. This is because the condition is evaluated after the loop body is executed. If the condition is true, the loop will continue to run; if it is false, the loop will exit after the first iteration. This makes do-while loops particularly useful when you want to ensure that the code block runs at least once, such as when prompting a user for input or initializing a process.
- A. The loop will execute once and stop
- B. The loop will throw an error
- C. The loop will run infinitely
- D. The loop will terminate after one iteration
Remarks:
Explanation:
If the condition in a do-while loop is always true, the loop will run infinitely because there is nothing to stop the loop. Since the condition is checked after each iteration, the loop body will continue to execute, and as long as the condition remains true, the loop will never exit. Infinite loops are a common mistake in programming and can cause a program to hang or crash, consuming resources indefinitely.
- A. Looping over an array with a known size
- B. Repeatedly prompting user input until a valid response is given
- C. Iterating over elements in a list
- D. Looping through numbers from 1 to 10
Remarks:
Explanation:
A do-while loop is ideal when you need to ensure that a block of code is executed at least once, regardless of the initial condition. A common use case is prompting a user for input, where you want the prompt to appear at least once before validating the input. For example, if you're asking for a non-empty string, the loop can continue prompting the user until valid input is received. Other loops like for and while may not guarantee that the prompt will appear at least once, depending on the initial condition.
- A. break
- B. continue
- C. exit()
- D. return
Remarks:
Explanation:
In C++, you can exit a do-while loop prematurely using the break statement. When the break statement is encountered inside the loop body, the loop is immediately terminated, and control moves to the statement following the loop. The continue statement, on the other hand, only skips the current iteration and proceeds with the next one. The exit() function terminates the entire program, and return exits the current function, not just the loop.
- A. Before the loop executes
- B. After each iteration
- C. At the end of the program
- D. In the middle of the loop body
Remarks:
Explanation:
In a do-while loop, the condition is checked after the loop body has been executed, making this type of loop unique. This behavior ensures that the loop body will always execute at least once. After each iteration, the condition is evaluated, and if the condition is true, the loop will execute again. If the condition is false, the loop will terminate. This control structure is useful in cases where you want to guarantee that the loop executes at least once, regardless of the initial state of the condition.
- A. The loop executes once
- B. The loop does not execute at all
- C. The loop runs indefinitely
- D. The loop throws an error
Remarks:
Explanation:
The do-while loop will always execute at least once, even if the condition is false on the first check. This is because the loop body is executed before the condition is checked for the first time. After the first iteration, if the condition is false, the loop will terminate and the program will move on. This behavior is in contrast to a while loop, which checks the condition before the first iteration and may not execute at all if the condition is false initially.