J
joseph.p.doyle
This code, compiled with visual studio .NET 2003,
double a = 95.022, b = 0.01;
printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a -
floor(a / b) * b);
a = 95.021, b = 0.01;
printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a -
floor(a / b) * b);
a = 95.020, b = 0.01;
printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a -
floor(a / b) * b);
a = 95.022, b = 0.01;
printf ("fmod(%lf, %lf) = %.17lf\n", a, b, fmod(a, b));
a = 95.021, b = 0.01;
printf ("fmod(%lf, %lf) = %.17lf\n", a, b, fmod(a, b));
a = 95.020, b = 0.01;
printf ("fmod(%lf, %lf) = %.17lf\n", a, b, fmod(a, b));
generates this output:
95.022000 - floor(95.022000 / 0.010000) * 0.010000 =
0.00200000000000955
95.021000 - floor(95.021000 / 0.010000) * 0.010000 =
0.00100000000000477
95.020000 - floor(95.020000 / 0.010000) * 0.010000 =
0.00000000000000000
fmod(95.022000, 0.010000) = 0.00200000000000359
fmod(95.021000, 0.010000) = 0.00099999999999882
fmod(95.020000, 0.010000) = 0.00999999999999404
everything makes sense, except for the last line. why does fmod return
0.01 instead of 0.0?
double a = 95.022, b = 0.01;
printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a -
floor(a / b) * b);
a = 95.021, b = 0.01;
printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a -
floor(a / b) * b);
a = 95.020, b = 0.01;
printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a -
floor(a / b) * b);
a = 95.022, b = 0.01;
printf ("fmod(%lf, %lf) = %.17lf\n", a, b, fmod(a, b));
a = 95.021, b = 0.01;
printf ("fmod(%lf, %lf) = %.17lf\n", a, b, fmod(a, b));
a = 95.020, b = 0.01;
printf ("fmod(%lf, %lf) = %.17lf\n", a, b, fmod(a, b));
generates this output:
95.022000 - floor(95.022000 / 0.010000) * 0.010000 =
0.00200000000000955
95.021000 - floor(95.021000 / 0.010000) * 0.010000 =
0.00100000000000477
95.020000 - floor(95.020000 / 0.010000) * 0.010000 =
0.00000000000000000
fmod(95.022000, 0.010000) = 0.00200000000000359
fmod(95.021000, 0.010000) = 0.00099999999999882
fmod(95.020000, 0.010000) = 0.00999999999999404
everything makes sense, except for the last line. why does fmod return
0.01 instead of 0.0?