Programming Concepts Quiz

Which of the following correctly initializes an array of integers with 5 elements?

• int[] array = new int[5];

• int array = new int[5];

• int array = new int[];

• int array = new int(5);

What is the index of the first element in an array?

• 0

• 1

• Depends on array type

• -1

What is the primary difference between a while loop and a do-while loop?

• A while loop checks the condition after executing the loop body.

• A do-while loop checks the condition before executing the loop body.

• A while loop checks the condition before executing the loop body.

• A do-while loop does not check any condition.

What will be the output of the following code snippet? int i = 0; while (i < 3) { Console.WriteLine(i); i++; }

• 0 1 2

• 0 1 2 3

• 1 2 3

• 1 2

Which of the following is true about a do-while loop?

• It will execute at least once even if the condition is false.

• It will not execute if the condition is false.

• It checks the condition before executing the loop body.

• It is used only for infinite loops.

Which of the following conditions will cause the loop to exit immediately?

• while (true)

• do {} while (false)

• while (1)

• do {} while (1)

Which method would you use to get the length of a string in C#?

• str.Size()

• str.Length

• str.GetLength()

• str.Count()

Which of the following methods can be used to compare two strings in C#?

• Equals()

• CompareTo()

• ==

• All of the above

Which of the following methods converts a string to uppercase in C#?

• str.ToUpper()

• str.UpperCase()

• str.Upper()

• str.ToUpperCase()

Which method is used to replace all occurrences of a specified substring in a string with another specified substring?

• ReplaceAll()

• Replace()

• Substitute()

• Change()