Type long double is nominally 80 bits, though a given compiler/os pairing may store it as 12. 4 8 12 16 v v v v 0.947368421052631578 long double 0.947368421052631526 double the answers. 而double大约能精确到小数点后面的15位左右。 具体精确到几位，跟所用的编译器有关，但是各个编辑器编译器之间，也是相差不大的。 至于整数部分，float表示的整数部分的范围，就已经够.
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double(*)[5] 是指向 double[5] 类型的指针类型。 double** 是指向 double* 类型的指针类型。 区别不是很显然的吗？ double[5] 类型能隐式转换成 double* 类型，但它们不是同一.
On the other hand, if you print out an arbitrary double with 15 decimal places and the convert it back to a double, you won't necessarily get the same value back—you need 17.
A double is a floating point type, not fixed point Do not use std::fixed as that fails to print small double as anything but 0.000.000 For large double, it prints many digits,. The term double precision is something of a misnomer because the precision is not really double
The standard only requires that long double is at least as precise as double, so some compilers will simply treat long double as if it is the same as double There are three floating point types Float, double, and long double The type double provides at least as much precision as float, and the type long double provides at least as.
Ieee754 single precision numbers have 32 bits (1 sign, 8 exponent and.
A double typically provides 16(±1) decimal digits
