Hey guys, could you give me any hint as to how to find if a number is even or odd in assembly language, mainly MIPS. I have to write a code that calculates Pi using floating point registers and my code would work 100% if I just knew how to make the conditions right for even or odd values. I was thinking of doing division and subtracting the number divided by the result but idk.
>>51567310
look at the lsb you trog
>>51567361
They're floating points, if it was a regular integer that'd be easy but I'm too tired/retarded to figure out how to set this up using the lsb
>>51567361
could i shift the result 31 times to the left and then see if its zero or not?
>>51567361
He's talking floating point numbers.
>>51567310
I think the idea of dividing by two and subtracting that quotient from the original number twice is a reasonable solution. Just be sure that when you do a compare that you don't compare to zero.
That is, using pseudo code:
double dbl1;
double dbl2;
...
dbl2 = dbl1 / 2.0;
// Fudge factor is some very small number since dbl1 - dbl2 - dbl2 might not be exactly zero in FP arithmetic.
if ((dbl1 - dbl2 - dbl2) < dblFudgeFactor)
{
// Divisible by two
}
else
{
// Not divisible by two
}
>>51567430
whats the reason for you subtracting dbl2 twice from dbl1?
>>51567505
dbl2 is half of dbl1. E.g.
dbl1 = 8.0;
dbl2 = 8.0 / 2.0; // dbl2 = 4.0
// dbl1 - dbl2 - dbl2 should be close to zero in FP representation.
>>51567399
>>51567430
Whoops. I like the divide by 2 method suggested.
>>51567430
I'm rusty on my floating point number representations, but you might need to take the absolute value of the result before comparing with dblFudgeFactor
>>51567690
You're correct. It's been a very long time since I've had to do anything with floating point numbers especially in assembly.
>>51567725
>>51567690
Thanks for your help guys. I'm trying my best to get this bullshit to work. Assembly is my first programming language ever and I want to die.
