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 restarts the inner loop from the beginning.

It breaks out of both the inner and outer loops.

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

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 exits the loop completely.

It modifies the current element in the collection.

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 cannot have break or continue statements.

Nested loops only work with foreach loops.

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

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

None

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

When you need to modify elements during iteration.

When you are working with an infinite collection.

When you need to skip certain elements in the collection.

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

None

What is the output of the following code?

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

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

blue, green, red

red, green, blue

green, blue

No output

None

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

The loop allows you to modify the collection during iteration.

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

The loop starts at the last element and iterates backward.

The loop requires a counter variable like a for loop.

None

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

forEach ( ) { /* code */ }

foreach { /* code */ }

foreach ( in ) { /* code */ }

for ( in ) { /* code */ }

None

What is a foreach loop used for in C#?

To create an infinite loop.

To declare multiple variables.

To execute code a fixed number of times.

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); 
}

No output

2, 4, 6, 8

1, 3, 5, 7, 9

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

None

10.

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

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

To restart the loop from the beginning.

To declare a new loop variable.

To terminate the loop early.

None

11.

What is the primary purpose of loops in C#?

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

To skip sections of code based on conditions.

To declare variables automatically.

To test the performance of code.

None

12.

How do nested for loops work?

They allow loops to reside inside other loops.

They terminate the outer loop early.

They prevent other loops from executing.

They run indefinitely until the outer loop ends.

None

13.

What is variable scope in relation to for loops?

All variables in a loop are automatically global.

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

Variables defined inside the loop are accessible throughout the program.

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

None

14.

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

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

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

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

while (true) { /* code */ }

None

15.

What does the loop expression do in a for loop?

It checks the condition before the loop starts.

It declares a new variable.

It outputs the result of the loop.

It updates the loop counter after each iteration.

None

16.

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

To restart the loop from the beginning.

To immediately exit the loop.

To declare a new loop variable.

To skip the current iteration of the loop.

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 terminates the loop.

It checks the loop condition.

It increments the loop counter.

It initializes a counter variable.

None

19.

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

while ( ) { /* code */ }

forEach in { /* code */ }

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

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

None