C# for Loop Quiz – Answertopia

Welcome to the C# Looping with the for Statement Quiz! This quiz will test your knowledge of loops in C#, focusing on the for loop and foreach loop constructs. You’ll explore key concepts such as loop syntax, variable scope, break and continue statements, nested loops, and the advantages of using different types of loops. Each question is designed to help you better understand how loops control the flow of execution in C# programs.

What happens when you use the break statement inside a nested loop?

It breaks out of the current inner loop but continues the outer loop.

It restarts the inner loop from the beginning.

It breaks out of both the inner and outer loops.

It skips the current iteration of the outer loop.

None

What is the effect of the continue statement when used in a foreach loop?

It restarts the iteration from the first element.

It modifies the current element in the collection.

It exits the loop completely.

It skips the current iteration and moves to the next item in the collection.

None

Which statement is true about nested loops in C#?

Nested loops only work with foreach loops.

Nested loops always terminate after one iteration of the outer loop.

Nested loops involve placing one loop inside another, allowing for multi-level iteration.

Nested loops cannot have break or continue statements.

None

When should you use a for loop instead of a foreach loop?

When you are only interested in some elements of a collection.

When you need to skip certain elements in the collection.

When you need to modify elements during iteration.

When you are working with an infinite collection.

None

What is the output of the following code?

string[] colors = { 'red', 'green', 'blue' };

foreach (string color in colors) {
 Console.WriteLine(color); 
}

No output

green, blue

blue, green, red

red, green, blue

None

Which of the following statements about the foreach loop is true?

The loop allows you to modify the collection during iteration.

The loop starts at the last element and iterates backward.

The loop iterates over all elements in the collection, from the first to the last.

The loop requires a counter variable like a for loop.

None

What is the correct syntax for a foreach loop in C#?

foreach { /* code */ }

for ( in ) { /* code */ }

forEach ( ) { /* code */ }

foreach ( in ) { /* code */ }

None

What is a foreach loop used for in C#?

To execute code a fixed number of times.

To declare multiple variables.

To create an infinite loop.

To iterate over items in a collection or array.

None

What is the output of the following code?

for (int i = 1; i < 10; i++) {
 if (i % 2 != 0)
 continue; 
 Console.WriteLine(i); 
}

1, 3, 5, 7, 9

2, 4, 6, 8

1, 2, 3, 4, 5, 6, 7, 8, 9

No output

None

10.

What is the purpose of the continue statement in a for loop?

To restart the loop from the beginning.

To skip the remaining code in the current iteration and move to the next iteration.

To declare a new loop variable.

To terminate the loop early.

None

11.

What is the primary purpose of loops in C#?

To declare variables automatically.

To test the performance of code.

To execute a sequence of statements repeatedly until a condition is met.

To skip sections of code based on conditions.

None

12.

How do nested for loops work?

They run indefinitely until the outer loop ends.

They terminate the outer loop early.

They prevent other loops from executing.

They allow loops to reside inside other loops.

None

13.

What is variable scope in relation to for loops?

Variables defined outside the loop cannot be used inside the loop.

All variables in a loop are automatically global.

Variables defined inside the loop are only accessible within the loop.

Variables defined inside the loop are accessible throughout the program.

None

14.

How do you create an infinite for loop in C#?

do { /* code */ } while (true);

for (i = 0; i > 0; i++) { /* code */ }

while (true) { /* code */ }

for (;;) { /* code */ }

None

15.

What does the loop expression do in a for loop?

It declares a new variable.

It outputs the result of the loop.

It updates the loop counter after each iteration.

It checks the condition before the loop starts.

None

16.

What is the purpose of the break statement in a loop?

To immediately exit the loop.

To skip the current iteration of the loop.

To declare a new loop variable.

To restart the loop from the beginning.

None

17.

What happens if the conditional expression in a for loop is false at the start?

The loop skips one iteration.

The loop will not execute.

The loop runs infinitely.

The loop executes at least once.

None

18.

What does the initializer element in a for loop do?

It increments the loop counter.

It checks the loop condition.

It initializes a counter variable.

It terminates the loop.

None

19.

Which of the following is the correct syntax for a basic C# for loop?

do { /* code */ } while ( );

for ( ; ; ) { /* code */ }

forEach in { /* code */ }

while ( ) { /* code */ }

None