larry@macom1.UUCP (Larry Taborek) (08/02/89)
Ok guys and gals.
I have a Altos 586 computer running 3.1a version of Xenix. In
using the standard compiler that comes with the development set,
I found that I can only do mathmatical operations on shorts and
integers. Floats, longs and doubles do not work. Example:
main()
{
int a;
long b;
a=0;b=0;
a++;
printf("a = %d\n",a);
a = a + 1;
printf("a = %d\n",a);
b++;
printf("b = %d\n",b);
b = b + 1;
printf("b = %d\n",b);
}
When run returns:
a = 1
a = 2
b = 0
b = 0
By the way, by using the sizeof command, I find that shorts and
integers take 2 bytes, longs and floats take 4 bytes and doubles
take 8 bytes.
I have looked in the compiler options to find out if there are
any floating point options. There arn't, or at least none
documented. Now I figure that you HAVE to be able to do this, so
what am I doing wrong?
Larry
--
Larry Taborek ..!uunet!grebyn!macom1!larry Centel Federal Systems
larry@macom1.UUCP 11400 Commerce Park Drive
Reston, VA 22091-1506
703-758-7000r4@cbnews.ATT.COM (richard.r.grady..jr) (08/02/89)
In article <4874@macom1.UUCP> larry@macom1.UUCP (Larry Taborek) writes: | Ok guys and gals. | | I have a Altos 586 computer running 3.1a version of Xenix. In | using the standard compiler that comes with the development set, | I found that I can only do mathmatical operations on shorts and | integers. Floats, longs and doubles do not work. Example: | | main() | { | int a; | long b; | | a=0;b=0; | a++; | printf("a = %d\n",a); | a = a + 1; | printf("a = %d\n",a); | b++; | printf("b = %d\n",b); | b = b + 1; | printf("b = %d\n",b); | } | | When run returns: | | a = 1 | a = 2 | b = 0 | b = 0 | | By the way, by using the sizeof command, I find that shorts and | integers take 2 bytes, longs and floats take 4 bytes and doubles | take 8 bytes. In your example above, you have to tell printf() that the data argument b is long. You do this by putting a letter "l" in the format specification: printf("b = %ld\n",b); Otherwise, printf() expects a 2-byte quantity, and it takes the first two (presumably, higher-order) bytes of the 4-byte long. These 2 bytes would be 00H, and printf() outputs 0. ------------------------------------------------------------------- Dick Grady r_r_grady@att.com ...!att!mvuxd!r4
allbery@nc386.UUCP (Brandon S. Allbery) (08/07/89)
You're gonna have one heck of a hard time trying to get a fix for that.... ++Brandon -- Brandon S. Allbery, moderator of comp.sources.misc allbery@NCoast.ORG uunet!hal.cwru.edu!ncoast!allbery ncoast!allbery@hal.cwru.edu "Why do trans-atlantic transfers take so long?" "Electrons don't swim very fast." -john@minster.york.ac.uk and whh@PacBell.COM