Control Statements and Loops Quiz
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Control Statements and Loops Quiz

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Questions and Answers

What do selection statements allow a computer to do?

  • Perform arithmetic calculations
  • Execute a fixed number of loops
  • Make choices based on a condition (correct)
  • Traverse through string characters

    • Which Boolean expression evaluates to True?

  • 5 < 3
  • 3 > 7
  • 4 != 4
  • 10 == 10 (correct)

    • Which statement best describes a multi-way selection statement?

  • It can handle more than two possible courses of action. (correct)
  • It checks only one condition at a time.
  • It only uses the 'and' logical operator.
  • It is the same as a one-way selection statement.

    • In a condition-controlled loop, what happens when the condition becomes false?

    <p>The loop halts and exits.</p> Signup and view all the answers

    What does the 'break' statement do within a loop?

    <p>Acts as a termination point for the loop.</p> Signup and view all the answers

    What is the simplest form of selection statement?

    <p>one-way selection</p> Signup and view all the answers

    What is the purpose of logical operators in compound Boolean expressions?

    <p>To combine multiple conditions in decision-making.</p> Signup and view all the answers

    Which type of loop halts when a specific condition becomes false?

    <p>Entry-controlled loop</p> Signup and view all the answers

    What is the primary purpose of short-circuit evaluation in Boolean expressions?

    <p>To stop evaluation as soon as the result is known</p> Signup and view all the answers

    Which logical operator has the highest precedence in Python?

    <p>not</p> Signup and view all the answers

    What type of loop is a 'for' loop primarily used for?

    <p>Count-controlled iteration</p> Signup and view all the answers

    What is an off-by-one error in the context of loops?

    <p>When loops execute more than intended by one iteration</p> Signup and view all the answers

    Which statement regarding selection statements is correct?

    <p>All possible branches must be tested to ensure reliability.</p> Signup and view all the answers

    Which of the following constructs a compound Boolean expression?

    <p>if (speed &gt; 60) and (light == green or light == yellow)</p> Signup and view all the answers

    What is a break statement used for in loops?

    <p>To exit the loop entirely</p> Signup and view all the answers

    Which statement is true about conditional iteration?

    <p>A while loop continues execution as long as the specified condition is true.</p> Signup and view all the answers

    What is a defining feature of a two-way selection statement in programming?

    <p>It includes both 'if' and 'else' clauses.</p> Signup and view all the answers

    Study Notes

    Control Statements

    • Selection statements allow the computer to make choices based on a condition.
    • The Boolean data type consists of two values: True and False.
    • if-else statements are used to check inputs for errors, they have two possible outcomes.
    • if statements are the simplest form of selection, they perform a task if a condition is True.
    • Multi-way if statements are used to test multiple conditions, they have more than two outcomes.
    • Logical operators: and, or, not are used to construct compound Boolean expressions.
    • Logical operators are evaluated after comparisons, but before the assignment operator (=).
    • Short-circuit evaluation stops evaluating a statement as soon as possible due to True or False results.

    Definite Iteration, for Loop and range()

    • Definite iteration repeats a set of commands a fixed number of times.
    • for loops use a range function to generate a sequence of numbers.
    • range(x) generates a sequence from 0 to x-1, range(y,z) generates a sequence from y to z-1.
    • Off-by-one errors occur when a loop does not perform the intended number of iterations.

    Conditional Iteration and the while loop

    • Conditional iteration repeats a set of commands while a condition is True.
    • An entry-controlled while loop keeps repeating until the condition becomes False.
    • A break statement can be used to exit a loop from its body prematurely.
    • Any for loop can be converted into an equivalent while loop.
    • An infinite loop continues indefinitely if the continuation condition never becomes False.
    • random.randint(x,y) returns a random integer between x and y, inclusive.

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    Related Documents

    Control_Statements_PPT_ch03.ppt

    Description

    Test your knowledge on control statements and loops in programming. This quiz covers selection statements, Boolean data types, multi-way conditions, and the use of for loops with the range() function. Dive in to see how well you understand these foundational concepts!

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