1.3 Compute OPA+OPB-OPC+OPD

;Given the following variables of type word already initialized in memory:
;•OPA = – 459
;•OPB = 470
;•OPC = – 32756
;•OPD = 1
;Write a program that computes the expression: OPA+OPB–OPC+OPD, using AX register, and observe, giving reason, the ;behavior of flags (sign, overflow, carry)

.MODEL small
.STACK
.DATA
OPA DW -459
OPB DW 470
OPC DW -32756
OPD DW 1
.CODE
.STARTUP
MOV AX,OPA
ADD AX,OPB
SUB AX,OPC
ADD AX,OPD
.EXIT
END