8086 Assembly Program for subtraction of two 16-bit numbers

For many other Language  Programs related to microprocessor 8086, data structures  and C++ visit our  BLOG 

Program to SUBTRACT two 16-bit numbers:-

data segment

no1 dw 21h

no2 dw 31h

ans dw ?

data ends

code segment

start : assume  cs :code,  ds :data

mov ax ,data

mov ds , ax

mov ax , no1

mov bx , no2

SUB ax , bx

mov ans ,ax

mov ah ,4ch

int 21h

code ends

end start

In assembly language 8086 we use mnemonics in order to perform arithmetic operations like SUB/SBB in subtraction.
So, Let's dive deep into what  SUB and SBB is ...

SUB:- It subtracts the data in source from data in destination and then stores result in destination. Source can be memory location or register or a number but destination should be register or a memory location(not immediate number). Remember that source and destination should be of same type and both shouldn't be memory locations.

Syntax: SUB <destination> <source>
Operation: destination← destination - source

SBB:- It is used to subtract source-operand and borrow. from destination-operand and then the result is stored in destination. Source can be memory location or register or a number but destination should be register or a memory location(not immediate number). Remember that source and destination should be of same type and both shouldn't be memory locations.

Syntax: SBB <destination> <source>
Operation: destination← destination - source - carry flag
Which flags get affected?
Ans- OF , CF, PF , AF, SF , ZF .

Addition of 8-bit  BCD8086 program

addition of 16-bit bcd program

Division of 32/16 bit program

Subtraction of 8-bit program

Subtraction of 8-bit BCD program

Subtraction of 16-bit program

Subtraction of 16-bit BCD program

Programs:-


For many other Assembly Language  Programs related to microprocessor 8086 visit our  BLOG 
There are programs of largest ,smallest ,division ,multiplication,odd/even,block operation ,string operations ,etc