;
;      CPE 221 Assembly Example
;
;    This program adds two arrays, value by value and
;    stores each result in another array.
;
;
;      int main()
;      {
;        const int size = 23;
;        char x[size] = {"ARM programming is fun"};
;        char y[size];
;        int i;
;        for (i = 0; i < size; i++)
;          y[i] = x[i];
;      }
;
       AREA  COPY_STRING, CODE, READONLY, ALIGN = 5
       ENTRY
       ADR    r0, x                ; pointer to first element of x
       ADR    r1, y                ; pointer to first element of y
       LDR    r3, size             ; holds size of arrays
       LDR    r4, i                ; holds loop counter
loop   CMP    r4, r3           ; compute i - size
       BPL    done                 ; if i - size >= 0, done
       LDRB   r5, [r0], #1         ; r5 = x[i]
       STRB   r5, [r1], #1         ; store result in z[i]
       ADD    r4, r4, #1
       B      loop
done   B      done
       AREA   COPY_STRING, DATA, READWRITE
size   DCD    23
i      DCD    0
x      DCB    "ARM Programming is fun", '\0'
       ALIGN
y      SPACE  23
	   END