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C Programming: While Loop

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Questions and Answers

What kind of loop is discussed at the beginning of the session?

If statement
Do-while loop
For loop
While statement (correct)

In a while loop, what happens if the expression is false?

The loop goes back to the expression without executing any statements
The loop continues indefinitely
The loop exits and the next statement outside the loop is executed (correct)
An error is generated

What is the difference between an if block and a while loop when the expression is true?

In both an if block and a while loop, the loop is exited immediately after executing a statement
In a while loop, the loop is exited immediately after executing a statement; in an if block, execution goes back to the expression
In an if block, the loop is exited immediately after executing a statement; in a while loop, execution goes back to the expression (correct)
Both in a while loop and an if block, execution goes back to the expression after executing a statement

What does the session aim to illustrate using a simple program?

The functionality of a while loop (C) Signup and view all the answers

What triggers the termination of input in the simple program discussed?

-1 is entered as an integer (C) Signup and view all the answers

In a while loop, what is the significance of checking if a equals -1?

It determines whether to enter or exit the loop (B) Signup and view all the answers

What would happen if 'a' is initially set to -1 in the simple program?

'a' would not enter the loop at all (A) Signup and view all the answers

What is the purpose of initializing the variable 's' to 0 before entering the loop?

To ensure that the sum starts from 0 before adding the input numbers (D) Signup and view all the answers

What is the significance of the condition 'a != -1' in the while loop?

It ensures that the loop continues executing until -1 is entered as input (B) Signup and view all the answers

If the input sequence is 5, 10, -3, -1, what will be the final value of 's' (the sum)?

12 (C) Signup and view all the answers

What is the purpose of the statement 's = s + a' inside the loop?

To add the current input number 'a' to the running sum 's' (D) Signup and view all the answers

If the input sequence is 2, 4, 6, 8, -1, what will be the final value of 'a'?

-1 (B) Signup and view all the answers

What is the term used to describe a single execution of the while loop?

Iteration (A) Signup and view all the answers

If the input sequence is -5, 10, 15, -1, what will be the final value of 's' (the sum)?

20 (B) Signup and view all the answers

What happens if the first input number is -1?

The loop will not execute, and 's' will remain 0 (D) Signup and view all the answers

What is the purpose of the statement 'scanf("%d", &a)' inside the loop?

To read the next input number and store it in 'a' (D) Signup and view all the answers

If the input sequence is 3, 6, 9, 12, -1, what will be the number of iterations of the loop?

4 (C) Signup and view all the answers

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