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At this point you should be able to build and run ours programs easily using, in the cases where we want to see the returned value (which is most cases), the caller_c script:

$ caller_c arithmetic add
DEC: 15
HEX: f
BIN: 0000000000000000000000000000000000000000000000000000000000001111

Here in add.asm we made an addition, now in sub.asm we do a subtraction:

$ caller_c arithmetic sub
DEC: 5
HEX: 5
BIN: 0000000000000000000000000000000000000000000000000000000000000101

And one that gives a negative result (sub_neg.asm):

$ caller_c arithmetic sub_neg
DEC: 18446744073709551615
HEX: ffffffffffffffff
BIN: 1111111111111111111111111111111111111111111111111111111111111111

The result of sub_neg.asm is -1, which, as we saw before, is represented as a bunch of ones.

To run the increment (inc.asm), decrement (dec.asm), multiplication (mul.asm) and signed multiplication (imul.asm) programs, the instructions are similar. Division is a bit more complicated so we will only see it later.

There are some subtle details to the specifications of how mul and imul are performed and where the results are stored. Some of it you can see in our mul.asm and imul.asm programs, but for more details, it is good to check a manual. Here are some nice references for mul and imul.