printf vs. big numbers

[jidanni]

What does one need to do to make this not blow up when $k reaches 10?
$ perl -wle 'for $k(10){for(qw/b d lld ld Ld o u x/){printf "%%$_\t%$_\n",10**$k}}'
%b 11111111111111111111111111111111
%d -1
%lld -1
%ld -1
%Ld -1
%o 37777777777
%u 4294967295
%x ffffffff

 

[Uri Guttman]

j> What does one need to do to make this not blow up when $k reaches 10?
j> $ perl -wle 'for $k(10){for(qw/b d lld ld Ld o u x/){printf "%%$_\t%$_\n",10**$k}}'
j> %b 11111111111111111111111111111111
j> %d -1
j> %lld -1
j> %ld -1
j> %Ld -1
j> %o 37777777777
j> %u 4294967295
j> %x ffffffff

perl -wle 'for $k(10){for(qw/f g b d lld ld Ld o u x/){printf "%%$_\t%$_\n",10**$k}}'
%f 10000000000.000000
%g 1e+10
%b 1001010100000010111110010000000000
%d 10000000000
%lld 10000000000
%ld 10000000000
%Ld 10000000000
%o 112402762000
%u 10000000000
%x 2540be400

get a 64 bit machine!

perl overflows integers to floats and you are seeing that. notice i
added f and g formats. try those. printing an integer format of a too
large float is going to generate nonsense since there aren't enough bits
to convert the number correctly.

uri