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- c - float vs. double precision - Stack Overflow
The reason it's called a double is because the number of bytes used to store it is double the number of a float (but this includes both the exponent and significand) The IEEE 754 standard (used by most compilers) allocates relatively more bits for the significand than the exponent (23 to 9 for float vs 52 to 12 for double ), which is why the
- c++ - double and accuracy - Stack Overflow
A double typically provides 16(±1) decimal digits Your example shows this: 4 8 12 16 v v v v 0 947368421052631578 long double 0 947368421052631526 double The answers agree to 16 digits This is what should be expected Also, note that there's no guarantee in the C Standard that a long double has more precision than a double
- C语言中，double**和double(*)[5]有什么区别？怎么理解？ - 知乎
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，但它们不是同一类型。 可以考虑一下 short 和 long 这两种类型是能相互隐式转换的，但它们显然没有因此变成同一
- c语言中float、double的区别和用法？ - 知乎
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，就已经够大了，能表示到万亿级别，已经大到没边了。
- What is the difference between float and double? - Stack Overflow
Type double, 64 bits long, has a bigger range (*10^+ -308) and 15 digits precision Type long double is nominally 80 bits, though a given compiler OS pairing may store it as 12-16 bytes for alignment purposes The long double has an exponent that just ridiculously huge and should have 19 digits precision
- Difference between long double and double in C and C++
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 But, on most x86 chips, the 10-byte extended precision format 80-bit number is available through the CPU's floating-point unit, which provides even more precision than 64-bit double , with
- How do I print a double value with full precision using cout?
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, perhaps hundreds of questionable informativeness
- What is the difference between Double and double in Java?
Some thing important to note, is that a complex data-type Double can be null I often use it when an operation could yield something else than a number, if something is not found, and a null value is required Else, if a result is mandatory, I do prefer using a primitive double type –
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