Addition & Subtraction

Addition and Subtraction

The two most basic arithmetic instructions:

add dst, src     ; dst = dst + src
sub dst, src     ; dst = dst - src

Both update the flags register (ZF, SF, CF, OF) based on the result.

Increment and Decrement

inc rax          ; rax = rax + 1
dec rax          ; rax = rax - 1

NEG: Two's Complement Negation

neg rax          ; rax = -rax

Computing and Printing a Number

To print a number, you need to convert it to ASCII digits. The simplest approach for single digits is to add 48 (ASCII '0'):

mov rax, 7       ; the number 7
add rax, 48      ; convert to ASCII '7' (55)

For this exercise, we will work with single-digit results.

Your Task

Compute the following and print each result as a digit followed by a newline:

1. 3 + 4 = 7
2. 9 - 5 = 4
3. Start with 0, increment 6 times = 6

Print: "7\n4\n6\n"