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#include <stdio.h>
#include <stdlib.h>
...
    }
    return 0;
}

rounding: 0
  compiler:   0x1.4f8b588e368f100000000000000000p-18 =>         0.0000
+05000000000000000409015270
...
  compiler:   0x1.10a137f38c54300000000000000000p-14 =>         0.0000
+64999999999999994305770190
  atof:       0x1.10a137f38c54300000000000000000p-14 =>         0.0000
+64999999999999994305770190
  calc:       0x1.10a137f38c54400000000000000000p-14 =>         0.0000
+65000000000000007858297346