From: seafac@WPAFB-JALCF.ARPA.UUCP
Subject: (none)
Date: Thu, 4-Jun-87 12:21:00 EDT [thread overview]
Date: Thu Jun 4 12:21:00 1987
Message-ID: <8706041655.AA23291@ucbvax.Berkeley.EDU> (raw)
DEC Ada Problem Report
from: Mr. Gary Sivak (513) 255-3586
ASD/ENASF
wright-Patterson Air Force Base, Ohio 45433-6503
There seems to be a problem with the way the VAX-hosted DEC-Ada
compiler V1.3-24 handles SHORT_INTEGER variables.
Explanation. In VAX Ada, the SHORT_INTEGER is defined as a 16-bit
two's complement number with the sign bit, in the left-most position,
set to 1 for negative values. For example, for 3-bit arithmetic we have:
NUMERIC_VALUE BIT_REPRESENTATION
-4 100
-3 101
-2 110
-1 111
0 000
1 001
2 010
3 011
The valid range of two's complement 3-bit numbers is thus -4 through +3.
Similarly, the range of 16-bit two's complement numbers is -32,768 through
+32,767.
Problem. One can store the minimum value -32,768 into a
SHORT_INTEGER variable with a GET instantiated for SHORT_INTEGER, but
you cannot do it Via an assignment statement. The exception
NUMERIC_ERROR is raised when you try. The minimal value an assignment
statement will accept is -32,767.
The following simple source code and test results demonstrate the problem:
with TEXT_IO; use TEXT_IO;
with SHORT_INTEGER_TEXT_IO; use SHORT_INTEGER_TEXT_IO;
procedure TEST_READ is
INPUT_VALUE : SHORT_INTEGER;
begin --TEST_READ
loop
PUT("Enter INPUT_VALUE. ");
GET(INPUT_VALUE);
NEW_LINE;
PUT(INPUT_VALUE);
NEW_LINE;
end loop;
end TEST_READ;
RUN TEST_READ
Enter INPUT_VALUE. 32767
32767
Enter INPUT_VALUE. -32767
-32767
Enter INPUT_VALUE. -32768
-32768
Enter INPUT_VALUE.
*INTERRUPT*
with TEXT_IO; use TEXT_IO;
with SHORT_INTEGER_TEXT_IO; use SHORT_INTEGER_TEXT_IO;
procedure TEST_ASSIGN is
INPUT_VALUE : SHORT_INTEGER;
begin --TEST_ASSIGN
INPUT_VALUE := -32768;
NEW_LINE;
PUT(INPUT_VALUE);
NEW_LINE;
end TEST_ASSIGN;
$ RUN TEST_ASSIGN
%ADA-I-NUMERIC_ERROR, NUMERIC_ERROR
%SYSTEM-F-INTDIV, arithmetic trap, integer divide by zero at PC=00000848,
PSL=03C000A6
%TRACE-E-TRACEBACK, symbolic stack dump follows
module name routine name line rel PC abs PC
0000D1D6 0000D1D6
----- above condition handler called with exception 00000484:
%SYSTEM-F-INTDIV, arithmetic trap, integer divide by zero at PC=00000848,
PSL=03C000A6
----- end of exception message
TEST_ASSIGN TEST_ASSIGN 7 00000012 00000848
ADA$ELAB_TEST_A ADA$ELAB_TEST_ASSIGN 00000009 00000609
000008D9 000008D9
0000CFD2 0000CFD2
ADA$ELAB_TEST_A ADA$ELAB_TEST_ASSIGN 0000001B 0000061B
000008B4 000008B4
if anyone knows why you can get but not assign, please let me know.
gary Sivak
------
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1987-06-04 16:21 seafac [this message]
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