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# perl -e 'printf("%.2f", 6.685);'
6.68

# perl -v
This is perl, v5.10.1 (*) built for i386-linux-thread-multi

# perl -e 'printf("%.2f", 6.685);'
6.69

# perl -v
This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi