java - Why does HALF_UP sometimes round down with double? -


the following code:

double doublevalue = 1713.6; float floatvalue = 1713.6f; string fs = "%-9s : %-7s %-7s\n"; system.out.printf( fs, "", "double", "float" );  decimalformat format = new decimalformat("#0"); system.out.printf( fs, "tostring", string.valueof( doublevalue ), string.valueof( floatvalue ) );  format.setroundingmode( roundingmode.down ); system.out.printf( fs, "down", format.format( doublevalue ), format.format( floatvalue ) );  format.setroundingmode( roundingmode.half_down ); system.out.printf( fs, "half_down", format.format( doublevalue ), format.format( floatvalue ) );  format.setroundingmode( roundingmode.half_up ); system.out.printf( fs, "half_up", format.format( doublevalue ), format.format( floatvalue ) );  format.setroundingmode( roundingmode.up ); system.out.printf( fs, "up", format.format( doublevalue ), format.format( floatvalue ) );

produces result (live code):

          : double  float   tostring  : 1713.6  1713.6  down      : 1713    1713    half_down : 1714    1714    half_up   : 1713    1714   <--- notice line        : 1714    1714

i know numbers cannot represented floating-point numbers. actual floating-point representation 1713.6 1713.5999755859375 (see this page).

but why half_up round down in case?

using java 1.8u25

there bug in java 8 regarding numberformat , roundingmod half_up see 8039915. fixed 8u40 (release notes).


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