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How do you round the addition or subtraction of two numbers
in assembler?
what does the following code do?
AP WKUR,=P'5' where WKUR is a label
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Answer Posted / steve holton
Vague, indeed....as you would round differently depending
upon the data type of the numbers involved. You can add
intergerss, floats (and doubles) and packed decimal numbers
in assembler - to which does this question refer?
As the second half of the Q addresses packed decimal, I will
assume that part one does as well...
There are various ways to round data - truncation is one
valid way, another is to move to the closest "whole value"
in the least significant digit desired in the result, or you
can mov4e to the closest number towards +infinity, or to the
closest towards -infinity, or the closest towards 0, etc.,
So first off, you need a better definition of "round". What
I think this question was attempting to get at was to see it
you know about the SRP (shift-and-round-packed) instruction,
which allows you to apply a rounding factor and shift the
packed decimal result to the desired number of significant
digits.
| Is This Answer Correct ? | 2 Yes | 1 No |
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In the house keeping section of an MVS assembly language program, like the one below STM R14,R12,12(R13) BASR R12,R0 USING *,R12,R11 LA R11,2048 LA R11,2048(R11,R12) .... .... 1. What if BASR R12,R0 IS NOT PRECEDE USING *,R12,R11? 2. USING (base address), REGISTER does USING directive says assembler to treat particular Register as a base register with the mentioned base address..in the above case * i.e current location counter..well if that is the case why we need BASR R12,R0 ? 3. What if I write like STM R14,R12,12(R13) BASR R12,R0 LA R11,2048 LA R11,2048(R11,R12) USING *,R12,R11 there is no address resolution being calculated in both LA statements so is it a right way to set Base register?..will there be any issues with Domain regarding R11 and R12?
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