CRYPTERS-ROUND-2

Which of the following declaration is not supported by C language?

• String str;

• char *str;

• float str = 3e2;

• Both String str; & float str = 3e2;

Which keyword is used to prevent any changes in the variable within a C program?

• immutable

• mutable

• const

• volatile

Answer explanation

const is a keyword constant in C program.

What is an example of iteration in C?

• for

• while

• do-while

• all of the mentioned

Which of following is not accepted in C?

• static a = 10; //static as

• static int func ; //parameter as static

• static static int a; //a static variable prefixed with static

• all of the mentioned

What is meant by ‘a’ in the following C operation?

Fp = fopen(“Random.txt”, “a”);

• Attach

• Append

• Apprehend

• Add

A normal queue, if implemented using an array of size MAX_SIZE, gets full when?

• Rear = MAX_SIZE – 1

• Front = (rear + 1)mod MAX_SIZE

• Front = rear + 1

• Rear = front

Answer explanation

When Rear = MAX_SIZE – 1, there will be no space left for the elements to be added in queue. Thus queue becomes full.

Which of the following is not the type of queue?

• Ordinary queue

• Single ended queue

• Circular queue

• Priority queue

Answer explanation

Queue always has two ends. So, single ended queue is not the type of queue

What will be the output after performing these sequence of operations

Push(20);

Push(4);

Top();

Pop();

Pop();

Pop();

Push(5);

Top();

• 20

• 4

• stack underflow

• 5

Answer explanation

20 and 4 which were pushed are popped by the two pop() statements, the recent push() is 5, hence top() returns 5.

Which data structure is needed to convert infix notation to postfix notation?

• Branch

• Tree

• Queue

• Stack

Answer explanation

The Stack data structure is used to convert infix expression to postfix expression. The purpose of stack is to reverse the order of the operators in the expression. It also serves as a storage structure, as no operator can be printed until both of its operands have appeared.

How many children does a binary tree have?

• 2

• How many children does a binary tree have?

• 0 or 1 or 2

• 0 or 1

Answer explanation

Can have atmost 2 nodes.