Why program counter is 16 bit register in 8085?

Why program counter is 16 bit register in 8085?

PC is a 16-bit register. It contains a memory address. This way 8085 becomes ready to fetch the next Byte of the instruction (in case instruction fetch is incomplete), or fetch the next opcode (in case instruction fetch is over). …

Why are the program counter and stack pointer?

They are the stack pointer, SP, and the program counter, PC. The Stack Pointer register will hold the address of the top location of the stack. And the program counter is a register always it will hold the address of the memory location from where the next instruction for execution will have to be fetched.

Why stack pointer is 8 bit in 8051?

The stack pointer in the 8051 is 8-bits wide, and it can take a value of 00 to FFH. When the 8051 is initialized, the SP register contains the value 07H. This means that the RAM location 08 is the first location used for the stack.

What does stack pointer do?

A stack pointer is a small register that stores the address of the last program request in a stack. When a new data item is entered or “pushed” onto the top of a stack, the stack pointer increments to the next physical memory address, and the new item is copied to that address.

What is the difference between Stack Pointer and the system stack?

The main difference between stack pointer and program counter is that the stack pointer is a register that stores the address of the last program request in a stack while the program counter is a register that stores the address of the next instruction to be executed from the memory.

Can a stock be described as a pointer?

Yes, stack can be described as a pointer as it contains a head pointer always pointing to the topmost element of the stack. The Push and Pop operations are performed using this pointer. A stack is represented as a pointer.

Why stack is called LIFO?

LIFO is short for “Last In First Out”. The last element pushed onto the stack will be the first element that gets popped off. If you were to pop all of the elements from the stack one at a time then they would appear in reverse order to the order that they were pushed on.

Is a stack FIFO or LIFO?

Stack is a LIFO (last in first out) data structure. The associated link to wikipedia contains detailed description and examples. Queue is a FIFO (first in first out) data structure. The last piece put into the stack is on the top, so it is the first one to come out.

How do you push in stack?

push() function is used to insert an element at the top of the stack….Algorithm

1. Push the given elements to the stack container one by one.
2. Keep popping the elements of stack until it becomes empty, and increment the counter variable.
3. Print the counter variable.

How do I check if a stack is empty?

empty() method in Java is used to check whether a stack is empty or not. The method is of boolean type and returns true if the stack is empty else false. Parameters: The method does not take any parameters. Return Value: The method returns boolean true if the stack is empty else it returns false.

How do you check if a stack is empty or not in C++?

empty() function is used to check if the stack container is empty or not….Algorithm

1. Check if the size of the stack is zero, if not add the top element to a variable initialised as 0, and pop the top element.
2. Repeat this step until the stack size becomes 0.
3. Print the final value of the variable.

How do I know if my stack is full?

void push (int stack[ ] , int x , int n) { if ( top == n-1 ) { //if top position is the last of position of stack, means stack is full .

Can a stack be full?

If the stack is full, then it is said to be an Overflow condition. Pop: Removes an item from the stack. The items are popped in the reversed order in which they are pushed. If the stack is empty, then it is said to be an Underflow condition.

How do I create an empty stack?

Either (as other answers suggest) allocate a memory zone and get a pointer to stack_t on the heap and initialize it correctly (perhaps thru a create_empty_stack function) or declare a stack_t local variable (on the call stack), initialize it explicitly, and pass a pointer to it: stack_t locstack = {. data={}, .

How many queues are needed to implement a stack?

To implement a stack using queue(with only enqueue and dequeue operations), how many queues will you need? Explanation: Either the push or the pop has to be a costly operation, and the costlier operation requires two queues.

What is the minimum number of queues required to implement a stack?

We need two queues to implement a stack. If we see dequeue command, then we dequeue first element from second queue but if second queue is empty we dequeue all elements from first queue and enqueue them in second queue and then dequeue the first element.

How many stacks are needed to implement a queen?

Answer: For implementation of a queue, a minimum of 2 stacks are required.