C Arrays Quiz – 20 Questions with Answers
20 questions · 15 min · Medium
Control Instructions in C
Test your knowledge of control instructions in C, including conditional statements, loops, switch statements, break, continue, and jump statements.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. Which statement is used to execute a block of code only when a condition is true in C?
- A. if
- B. for
- C. switch
- D. goto
Show answer
A. if
The if statement executes its associated statement or block when the specified condition evaluates to true.
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2. Which statement is used to provide an alternative block when an if condition is false?
- A. else
- B. default
- C. otherwise
- D. alternate
Show answer
A. else
The else statement provides an alternative block of code when the associated if condition is false.
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3. Which statement is used to test multiple conditions sequentially in C?
- A. else if
- B. repeat if
- C. case if
- D. multiple if
Show answer
A. else if
An else if statement allows multiple conditions to be checked in sequence.
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4. Which C statement is commonly used to select one block of code from multiple alternatives based on an expression?
- A. switch
- B. select
- C. choose
- D. match
Show answer
A. switch
The switch statement selects among multiple case labels based on the value of an integral or enumeration expression.
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5. Which keyword is used to define an alternative case when no switch case matches?
- A. default
- B. else
- C. otherwise
- D. fallback
Show answer
A. default
The default label in a switch statement is executed when none of the case labels matches the switch expression.
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6. Which loop is generally used when the number of iterations is known or controlled by an initialization, condition, and update expression?
- A. for
- B. switch
- C. if
- D. goto
Show answer
A. for
The for loop combines initialization, a controlling condition, and an iteration expression in its syntax.
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7. Which loop checks its condition before executing the loop body?
- A. while
- B. do-while
- C. repeat-until
- D. foreach
Show answer
A. while
A while loop evaluates its controlling expression before each iteration, so its body may execute zero times.
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8. Which loop guarantees that its body executes at least once?
- A. do-while
- B. while
- C. for
- D. switch
Show answer
A. do-while
A do-while loop executes its body before testing the condition, so the body runs at least once.
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9. Which keyword immediately terminates the nearest enclosing loop or switch statement?
- A. break
- B. exit
- C. stop
- D. terminate
Show answer
A. break
The break statement terminates execution of the nearest enclosing loop or switch statement.
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10. Which keyword skips the remaining statements in the current loop iteration and proceeds to the next iteration?
- A. continue
- B. skip
- C. next
- D. pass
Show answer
A. continue
The continue statement skips the remainder of the current loop body and continues with the next iteration.
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11. What is the purpose of the goto statement in C?
- A. To transfer control to a labeled statement
- B. To repeat a loop automatically
- C. To terminate the entire program
- D. To declare a function
Show answer
A. To transfer control to a labeled statement
The goto statement transfers execution directly to a statement identified by a label within the same function.
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12. What will be printed by the following code? int x = 5; if (x > 3) printf("Yes"); else printf("No");
- A. Yes
- B. No
- C. YesNo
- D. Nothing
Show answer
A. Yes
Since x is 5 and 5 > 3 is true, the statement inside the if branch prints Yes.
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13. What happens when a break statement is encountered inside a switch case?
- A. Execution exits the switch statement
- B. The next case is always executed
- C. The entire program terminates
- D. The switch expression is evaluated again
Show answer
A. Execution exits the switch statement
A break statement exits the nearest enclosing switch statement. Without break, execution can continue into subsequent cases.
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14. What is the output of the following code? int i; for (i = 0; i < 3; i++) printf("%d ", i);
- A. 0 1 2
- B. 1 2 3
- C. 0 1 2 3
- D. 3 2 1
Show answer
A. 0 1 2
The loop starts at 0 and continues while i is less than 3, producing 0, 1, and 2.
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15. Which type of control structure is represented by an if-else statement?
- A. Selection
- B. Iteration
- C. Function declaration
- D. Preprocessing
Show answer
A. Selection
An if-else statement is a selection control structure because it chooses which block of code to execute based on a condition.