Anonymous Monk is mistaken. This isn't a precision issue. It's banker's rounding.
printf("%.0f\n", 100.5); # 100
printf("%.0f\n", 101.5); # 102
printf("%.0f\n", 102.5); # 102
printf("%.0f\n", 103.5); # 104
printf("%.0f\n", 104.5); # 104
printf("%.0f\n", 105.5); # 106
Note that all those numbers (but not 100.55) can be represented precisely in floats (0.5 = 2-1).
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