PSS ID Number: 109877
Article Last Modified on 11/2/1999
The information in this article applies to:
- Microsoft Fortran Powerstation 32 for Windows NT 1.0
This article was previously published under Q109877
SYMPTOMS
An attempt to execute a program that reads in the smallest negative integer within the range of the variable type may cause the following run-time error to be generated:
RESOLUTION
Because these smallest integers do not cause a problem when calculated internally, this problem can be addressed by changing the input data to the smallest allowable value for the integer size, and then subtracting one (1) after the value is read in.
STATUS
Microsoft has confirmed this to be a problem in Microsoft FORTRAN PowerStation 32 for NT, version 1.0. This is not a problem in Microsoft FORTRAN for MS-DOS, version 5.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.
MORE INFORMATION
The range of integers that can be read in correctly is:
-127 to 127 for INTEGER*1
-32,767 to 32,767 for INTEGER*2
-2,147,483,647 to 2,147,483,647 for INTEGER*4
The problem occurs when trying to read in
-128 for INTEGER*1
-32,768 for INTEGER*2
-2,147,483,648 for INTEGER*4
Sample Code
C Compile options needed: have no effect
C The following code demonstrates the problem:
integer*1 i
integer*2 j
integer*4 k
open(1,file='test.dat')
do n=3,5
write(1,*) -2**((2**n-1)) !write -128, -32768, -2147483648
end do
rewind(1)
read(1,*,iostat=ierr) i
if(ierr.eq.6100) then
print*, 'error reading integer*1 was: ',ierr
end if
read(1,*,iostat=ierr) j
if(ierr.eq.6100) then
print*, 'error reading integer*2 was: ',ierr
end if
read(1,*,iostat=ierr) k
if(ierr.eq.6100) then
print*, 'error reading integer*4 was: ',ierr
end if
pause
end
REFERENCES
Microsoft FORTRAN PowerStation 32 "Programmer's Guide," page 48, "Integer Data Types."
Additional query words: 1.00
Keywords: KB109877
Technology: kbAudDeveloper kbFORTRANPower32100NT kbFortranSearch kbZNotKeyword2
