Hidden city object adventure what are difference between is 50 percent or double in location better9/20/2023 Of course, sometimes, even double isn't accurate enough, hence we sometimes have long double (the above example gives 9.000000000000000066 on Mac), but all floating point types suffer from round-off errors, so if precision is very important (e.g. computing the factorial of 60.ĭuring testing, maybe a few test cases contain these huge numbers, which may cause your programs to fail if you use floats. a special floating-point number) much more easily than double for something simple, e.g. Printf("%.15g\n", b) // prints 8.99999999999996Īlso, the maximum value of float is about 3e38, but double is about 1.7e308, so using float can hit "infinity" (i.e. This precision loss could lead to greater truncation errors being accumulated when repeated calculations are done, e.g. Here's how the number of digits are calculated:ĭouble has 52 mantissa bits + 1 hidden bit: log(2 53)÷log(10) = 15.95 digitsįloat has 23 mantissa bits + 1 hidden bit: log(2 24)÷log(10) = 7.22 digits In general a double has 15 decimal digits of precision, while float has 7. As the name implies, a double has 2x the precision of float.
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