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Questions and Answers
What is the primary purpose of using loops in programming?
What is the primary purpose of using loops in programming?
- To make the code longer for clarity
- To create confusion in program flow
- To execute instructions repeatedly without redundancy (correct)
- To use more system resources than needed
In Python, which type of loop is indicated to be an indefinite loop?
In Python, which type of loop is indicated to be an indefinite loop?
- while loop (correct)
- for loop
- do-while loop
- nested loop
What will happen if the condition in a while loop evaluates to False?
What will happen if the condition in a while loop evaluates to False?
- The statements inside the loop will be executed
- The loop will execute at least once regardless of the condition
- The program will enter an infinite loop
- Program control will exit the loop and proceed to the next statement (correct)
Which statement correctly defines the syntax of a while loop in Python?
Which statement correctly defines the syntax of a while loop in Python?
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How can we describe the flow of control in a while loop?
How can we describe the flow of control in a while loop?
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Study Notes
Loops
- Loops are statements that repeat a block of code until a certain condition is met
- Loops help to reduce code redundancy and make programs more efficient
Types of Loops
-
while loop: Repeats a block of code as long as a condition is true
- Indefinite loop - the number of iterations is unknown until runtime
- Condition is evaluated before each iteration
- If the condition is true, the loop body executes
- If the condition is false, the loop terminates
- Syntax:
while condition:
-
Example: Print "Hello, World!" 5 times*
- Initialize a variable
num_of_timesto 1 - Use a
whileloop with the conditionnum_of_times <= 5 - Inside the loop:
- Print "Hello, World!"
- Increment
num_of_timesby 1 - When
num_of_timesis greater than 5, the loop terminates
- Initialize a variable
Flow Diagram of a while Loop
- The loop checks the condition,
- If the condition is true, the code inside the loop executes,
- The loop iterates again to check the condition,
- If the condition is false, the loop terminates,
- Control jumps to the next statement after the loop.
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