I have a project where I have to perform some mathematics calculations with double variables. The problem is that I get different results on SUN Solaris 9 and Linux. There are a lot of ways (explained here and other forums) how to make Linux work as Sun, but not the other way around. I cannot touch the Linux code, so it is only SUN I can change. Is there any way to make SUN to behave as Linux?

The code I run(compile with gcc on both systems):

int hash_func(char *long_id)          
{                                 
    double      product, lnum, gold;
    while (*long_id)
        lnum = lnum * 10.0 + (*long_id++ - '0');
    printf("lnum  => %20.20f\n", lnum);
    lnum = lnum * 10.0E-8;
    printf("lnum  => %20.20f\n", lnum);
    gold = 0.6125423371582974;
    product = lnum * gold;
    printf("product => %20.20f\n", product);
    ...
}

if the input is 339886769243483

the output in Linux:

lnum  => 339886769243**483**.00000000000000000000

lnum  => 33988676.9243**4829473495483398**

product => 20819503.600158**59827399253845**

When on SUN:

lnum => 339886769243483.00000000000000000000

lnum => 33988676.92434830218553543091

product = 20819503.600158**60199928283691**

Note: The result is not always different, moreover most of the times it is the same. Just 10 15-digit numbers out of 60000 have this problem.

Please help!!!