30 Nov
2001
30 Nov
'01
3:08 p.m.
Dear All
I've found a simple case of a bug in writeln():
program sumbug(input,output);
begin writeln(10.0*0.01); writeln(100.0*0.001); writeln(1.0*0.1); end.
All should print 0.1 I guess, but I get:
% ./bug :.000000000000000e-02 :.000000000000000e-02 1.000000000000000e-01
Interestingly ':' is the next character after '9' in the ASCII table, so it appears to be trying to print out the ASCII chacter for '10' (ten). 10.0e-02 is 0.1 after all !
This happens with the latest gpc-20011123 and also gpc-20010512 (that's all I've tested).
Many thanks
Ian
--
Ian Thurlbeck http://www.stams.strath.ac.uk/
Statistics and Modelling Science, University of Strathclyde
Livingstone Tower, 26 Richmond Street, Glasgow, UK, G1 1XH
Tel: +44 (0)141 548 3667 Fax: +44 (0)141 552 2079