C loops and conditionals

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Questions and Answers

Regarding the break statement within a switch case in C, which statement is accurate?

  • It causes a compilation error if omitted.
  • It is required only for the `default` case.
  • It is mandatory to avoid fall-through.
  • It is optional. (correct)

How many times will the following do-while loop execute? int i = 5; do { printf("%d ", i); i++; } while (i < 5);

  • Infinite times
  • 1 time (correct)
  • 5 times
  • 0 times

Which function is typically used to print output in Turbo C?

  • `input()`
  • `display()`
  • `print()` (correct)
  • `output()`

Which keyword is used to define the action to be taken when no cases match the expression in a switch statement?

<p><code>default</code> (C)</p>
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What is the primary purpose of the initialization expression in a for loop?

<p>To initialize loop control variables before the loop begins. (C)</p>
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In a for loop, what occurs if the condition evaluates to false upon initial evaluation?

<p>The loop body is never executed. (B)</p>
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Which statement is used to prematurely exit a for loop in C?

<p><code>break</code> (C)</p>
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Which statement is used to prematurely exit a do-while loop in C?

<p><code>break</code> (A)</p>
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Which of the following expressions correctly checks if a number is even in Turbo C?

<p><code>if (num % 2 == 0)</code> (D)</p>
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Which statement correctly defines the default case in a switch statement in C?

<p><code>default:</code> (D)</p>
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Which of the following statements accurately describes the behavior of the switch statement in C?

<p>It evaluates expressions for each case. (C)</p>
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Which statement is true regarding the initialization expression in a do-while loop?

<p>It is not part of the <code>do-while</code> loop syntax. (B)</p>
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What is the purpose of the else keyword in Turbo C?

<p>It is used to denote an alternative condition to <code>if</code>. (A)</p>
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Which data type can be used as the controlling expression in a switch statement?

<p><code>char</code> (A)</p>
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Concerning the initialization expression in a while loop, which of the following is true?

<p>It is typically done before entering the loop. (B)</p>
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What are the three expressions, separated by semicolons, that constitute the structure of a for loop?

<p>Initialization, condition, increment (A)</p>
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Which of the following is NOT a valid way to write a compound condition in Turbo C?

<p><code>condition1 AND condition2</code> (A)</p>
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Which control structure is not typically suited for situations requiring repetition until the user decides to terminate the program?

<p>a loop structure (A)</p>
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Choose the statement that accurately describes the behavior of a do-while loop.

<p>It guarantees at least one execution of the loop body. (B)</p>
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What occurs if the increment expression in a for loop is configured as a decrement operation?

<p>The loop will count down instead of counting up. (A)</p>
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Flashcards

Break in Switch

The 'break' statement in a switch case is optional.

Do-While Evaluation

The condition is evaluated after the loop body.

Print in Turbo C

print() is used to print output in Turbo C.

Default Case Keyword

The 'default' keyword specifies the default case.

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For Loop Initialization

Initializes loop control variables before the loop.

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False For-Loop Condition

The loop body is never executed.

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Premature For-Loop Exit

break is used to exit a for loop prematurely.

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Premature Do-While Exit

Used to prematurely exit a do-while loop in C

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Check Even Number

if (num % 2 == 0) checks if a number is even.

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Default Case Definition

default: correctly defines the default case.

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Switch Evaluation

The switch statement evaluates expressions for each case.

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Initialization in While Loop

Initialization is typically done before entering the loop.

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For Loop Expressions

for loop syntax: Initialization, condition, increment.

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Switch Controlling Expression

char can be used as controlling expression.

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Start For Loop

'for' is used to start a for loop in C.

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Termination Condition

It determines when the loop will terminate.

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Switch Statement Purpose

The switch statement executes a series of statements based on the value of a variable.

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What happens when an If statement fails.

If the condition in an 'if' statement evaluates to false the program skips the code block

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Study Notes

  • The break statement in a switch case is optional.
  • The break statement is used to prematurely exit a for loop in C.
  • The break statement is used to prematurely exit a do-while loop in C.
  • if (num % 2 == 0) correctly checks if a number is even in Turbo C.
  • default: correctly defines the default case in a switch statement in C.
  • The switch statement in C evaluates expressions for each case.
  • The initialization expression in a do-while loop is not part of the do-while loop syntax.
  • The else keyword used to denote an alternative condition to if in Turbo C.
  • char can be used as the controlling expression in a switch statement.
  • The initialization expression in a while loop is typically done before entering the loop..
  • The three expressions in a for loop are initialization, condition, and increment, separated by semicolons.
  • "condition1 | condition2" is not a valid way to write a compound condition in Turbo C.
  • A for loop structure cannot be used in iteration requiring the program to repeat execution until the user decides to terminate the program.
  • A do-while loop guarantees at least one execution of the loop body.
  • Keyword to start a for loop in C is for.
  • The termination condition in a for loop determines when the loop will terminate.
  • The keyword used to exit a switch statement prematurely in C is break.
  • A do-while loop in C evaluates the loop condition at the end of each iteration.
  • There is no limit to the maximum number of 'if' statements that can be nested in Turbo C.
  • The loop condition in a while loop is typically evaluated before entering the loop body.
  • The do-while loop structure in C ensures that the loop body is executed at least once.
  • Multiple for loops can be nested within each other in C.
  • Nesting 'if' statements in Turbo C creates a hierarchical decision structure.
  • double is not a valid data type for the controlling expression of a switch statement.
  • The correct syntax to define the do-while loop structure in C is do { ... } while (condition);.
  • An infinite loop is created using a for loop by leaving all three expressions empty.
  • If a break statement is omitted in a case block in C, it will execute the next case.
  • Syntax: if (condition) { ... } is the syntax for an 'if' statement in Turbo C
  • The first loop encountered in the code is considered the outer loop in a nested loop structure.
  • Variables declared inside a for loop are only accessible within the loop.
  • Struct is not a valid type for the loop control variable in a for loop.
  • The 'if' structure in Turbo C can be nested within another 'if' statement.
  • The loop counts down instead of up if the increment expression in a for loop is a decrement operation.
  • A do-while executes its body at least once.
  • Fallthrough causes execution to jump to the next case label in a switch statement.
  • A while loop evaluates the loop condition before each iteration.
  • A do-while loop evaluates the loop condition after each iteration.
  • The increment expression in a while loop : it updates loop control variables after each iteration.
  • The symbol to denote the equality condition in an 'if' statement ==.
  • In Turbo C, "==" is used to check equality in an if statement.
  • A for loop iterates over a block of code a fixed number of times.
  • The operator && is used to combine multiple conditions in an 'if' statement in Turbo C.
  • The program skips the code block within the if statement if the condition in an if statement in Turbo C evaluates to false.
  • print(), is used to print output in Turbo C.
  • If loop condition in for loop is false initially, the loop body is never executed.
  • In a do-while loop the loop repeats 1 time.
  • To initialize loop control variables before the loop begins, variables that are used for while, do-while, and for loops have to be defined prior to loop.
  • If the condition in a for loop evaluates to false initially, the loop body is never executed.
  • The default case executes if none of the case values match the value of the controlling expression in a switch statement.
  • The increment expression in a for loop updates loop control variables after each iteration.
  • A compilation error results if a case label contains multiple values separated by commas in a switch statement.
  • The scanf() function is used to input data in Turbo C.
  • The break statement in a switch case terminates the switch statement.
  • The initialization expression in a for loop: it is used to initialize loop control variables and it is executed only once, at the beginning of the loop
  • Variables declared inside for a loop are only accessible within the loop.
  • A constant is not allowed in a case label of a switch statement.
  • do {...} while (condition); is a correct syntax for a do-while loop in C
  • The maximum number of case labels that can be specified in a switch statement in C: There is no limit.
  • A switch statement in C executes a series of statements based on the value of a variable.
  • If there is no break statement at the end of a case block, execution will skip the current case and execute the next case.

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