0x19. C - Stacks, Queues - LIFO, FIFO
- push, pall mandatory
Implement the push and pall opcodes.
The push opcode
The opcode push pushes an element to the stack.
Usage: push <int>
where <int> is an integer
if <int> is not an integer or if there is no argument given to push, print the error message L<line_number>: usage: push integer, followed by a new line, and exit with the status EXIT_FAILURE
where is the line number in the file
You won’t have to deal with overflows. Use the atoi function
The pall opcode
The opcode pall prints all the values on the stack, starting from the top of the stack.
Usage pall
Format: see example
If the stack is empty, don’t print anything
- pint mandatory
Implement the pint opcode.
The pint opcode
The opcode pint prints the value at the top of the stack, followed by a new line.
Usage: pint
If the stack is empty, print the error message L<line_number>: can't pint, stack empty, followed by a new line, and exit with the status EXIT_FAILURE
- pop mandatory
Implement the pop opcode.
The pop opcode
The opcode pop removes the top element of the stack.
Usage: pop
If the stack is empty, print the error message L<line_number>: can't pop an empty stack, followed by a new line, and exit with the status EXIT_FAILURE
- swap mandatory
Implement the swap opcode.
The swap opcode
The opcode swap swaps the top two elements of the stack.
Usage: swap
If the stack contains less than two elements, print the error message L<line_number>: can't swap, stack too short, followed by a new line, and exit with the status EXIT_FAILURE
- add mandatory
Implement the add opcode.
The add opcode
The opcode add adds the top two elements of the stack.
Usage: add
If the stack contains less than two elements, print the error message L<line_number>: can't add, stack too short, followed by a new line, and exit with the status EXIT_FAILURE
The result is stored in the second top element of the stack, and the top element is removed, so that at the end:
The top element of the stack contains the result
The stack is one element shorter
- nop mandatory
Implement the nop opcode.
The nop opcode
The opcode nop doesn’t do anything.
Usage: nop