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$ perl -e 'printf("%.1f %.2f %.3f %.4f\n", 1, 2, 3), 4;'
1.0 2.00 3.000 0.0000
$ perl -e 'printf("%.1f %.2f %.3f %.4f\n", 1, 2, 3, 4);'
1.0 2.00 3.000 4.0000