;
; Just check out MPLAB

  INCLUDE "p16f873.inc"

;  Register Usage
 CBLOCK 0x020	;  registers start after special registers
  i, j,k    ; reserve space for three byte variables
 ENDC


 __CONFIG _CP_OFF & _DEBUG_OFF & _WRT_ENABLE_OFF & _CPD_OFF & _LVP_OFF &  _PWRTE_ON & _WDT_OFF & _XT_OSC 
 
; C Program equivalent
;  #define myid 100
;  unsigned char i,j,k;
;
;     i = myid;   /* myvalue = 100 */
;     i = i + 1;   /* i++, i = 101 */
;     j = i;       /* j is 101 */
;     j = j - 1;   /* j--, j is 100 */
;     k = j + i;    /* k = 201 */
;

myid equ  D'100'  ; change this number (100) to the LAST two digits
	             ; of your Student ID. If the last two digits
		     ; of your Student ID are '00', then use the first
		     ; two digits of you student ID.
  org    0

; i = 100; 
  movlw  myid   ; w <- 100 
  movwf  i      ; i <- w;

; i = i + 1;
  incf   i,f    ; i <- i + 1

; j = i
  movf   i,w     ; w <- i
  movwf  j      ; j <- w

; j = j - 1;
  decf   j,f    ; j <- j - 1

; k = j + i
  movf   i,w    ; w <- i
  addwf  j,w    ; w <- w + j
  movwf  k    ; k <- w


here
  goto   here	  ; loop forever


  end

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