Question

Write MARIE assembly language programs that do the following:

Write a program that inputs an integer and prints to output a countdown from the integer to 0. For example, if 7 is input:

7

6

5

4

3

2

1

0

Answer 1

The marie program is

INPUT //Takes input from user.
STORE X //stores the value of x in memory
LOOP :
LOAD X //loads the value in accumulator.

OUTPUT //displays the output
SUBT ONE //value of x is reduced by one
STORE X //stores the new value to X
LOAD X //Loads value of x into accumulator

SKIPCOND 400 // skips below condition if accumulator's value is zero; i.e x = 0
JUMP LOOP
HALT // end program

Hope this helps you :)