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$ perl -e 'printf "13.24 rounds to %.*f0\n", 1, 13.24'; 13.24 rounds to 13.20 ... $ perl -e 'printf "13.26 rounds to %.*f0\n", 1, 13.26'; 13.26 rounds to 13.30
> say sprintf("13.24 rounds to %.*f0", 1, 13.24); 13.24 rounds to 13.20 ... > say sprintf("13.26 rounds to %.*f0", 1, 13.26); 13.26 rounds to 13.30