DSA Quest 1.0

Which of the following loops will iterate 5 times?

• for (int i = 0; i < 3; i++)

• for (int i = 1; i <= 5; i++)

• while (i < 5) (assuming i is not initialized)

• do { ... } while (i < 5) (assuming i is not initialized)

What is the output of the following code?

• 10

• 15

• 20

• Cannot be determined without knowing the size of arr

What is the time complexity of finding the maximum element in an unsorted array using a linear search?

• O(1)

• O(log n)

• O(n)

• O(n^2)

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

• To increment the loop counter

• To exit the loop immediately

• To continue to the next iteration

• To initialize the loop counter

When defining an array in C++, which of the following is NOT allowed?

• Specifying the array size at declaration

• Not specifying the array size at declaration and using dynamic memory allocation

• Initializing the array with a list of values enclosed in curly braces

• Declaring an array with a negative size

What is the difference between a one-dimensional and a two-dimensional array?

• 1D arrays store multiple values of the same data type, while 2D arrays store multiple 1D arrays.

• 2D arrays store multiple values of the same data type, while 1D arrays store multiple 1D arrays.

• 1D arrays store values in a single row, while 2D arrays store values in multiple rows and columns.

• There is no difference; both store multiple values of the same data type.

What is the output of the following code?

• 10 20 30 40

• 0 0 30 40

• 10 0 0 0

• 0 0 0 40

What is the difference between a for loop and a while loop?

• Both use the same syntax but have different time complexities.

• for loops are used for fixed iterations, while while loops are used for unknown iterations.

• for loops are better for iterating over arrays, while while loops are better for user input.

• There is no difference; both iterate over a block of code repeatedly.

What is a common use case for recursion in programming?

• To print all elements of an array

• To calculate the factorial of a number

• To check if a number is prime

• To search for a specific element in an array

Analyse the following code and choose the answer accordingly?

• Everytime creats a new String and adds the characters to it.

• Adds the characters to the same String variable,

• It is not a String at all.

• it will give error.