Question

Without using move or li, write MIPS assembly language using MARS simulator to print a half pyramid depending on a value n of a user input. Such that if n = 5 were entered the following would be printed:

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

Answer 1

Code:

;Assume SI holds the number n (>=1) of rows of the pyramid

.286
.model small
.stack 1024h
.data

.code

        mov      cx, 1                  ;Outer counter (i)

_rows_loop:
        mov     bx, 1               ;Inner counter (j)
__cols_loop:

        ;Print number bx

        inc bx                          ;Increment inner counter
        cmp bx, cx                      ;If (j<i) keep looping
        jb _cols_loop

        ;Print new-line

        inc cx                          ;Increment outer counter
        cmp cx, si                      ;If (i<n) keep looping
        jb _rows_loop

end