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- 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。
- 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
- 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
- Whats the difference between a single precision and double precision . . .
The term double precision is something of a misnomer because the precision is not really double The word double derives from the fact that a double-precision number uses twice as many bits as a regular floating-point number For example, if a single-precision number requires 32 bits, its double-precision counterpart will be 64 bits long
- 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
- Correct format specifier for double in printf - Stack Overflow
Format %lf is a perfectly correct printf format for double, exactly as you used it There's nothing wrong with your code There's nothing wrong with your code Format %lf in printf was not supported in old (pre-C99) versions of C language, which created superficial "inconsistency" between format specifiers for double in printf and scanf
- Integer division: How do you produce a double? - Stack Overflow
1 double d = (double)5 20; 2 double v = (double)5 (double) 20; 3 double v = 5 (double) 20; Note that casting the result won't do it Because first division is done as per precedence rule double d = (double)(5 20); produces 0 0 I do not think there is any problem with casting as such you are thinking about
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