c语言中float、double的区别和用法？ - 知乎
C语言中，float和double都属于 浮点数。区别在于：double所表示的范围，整数部分范围大于float，小数部分，精度也高于float。 举个例子： 圆周率 3.1415926535 这个数字，如果用float来表示，最多只能精确到小数点后面的6位。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 ...

What is the difference between float and double? - Stack Overflow
I've read about the difference between double precision and single precision. However, in most cases, float and double seem to be interchangeable, i.e. using one or the other does not seem to affec...

¿Qué diferencia entre float y double en C++?
En double se pueden almacenar números más grandes y también más decimales. Con los números que has probado no se ve diferencia porque cout << redondea la representación interna para mostrar pocos decimales, y lo que ves en ambos casos es lo mismo, pero internamente no son iguales.

C语言中，double**和double (*) [5]有什么区别？怎么理解？
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类型。

Difference between long double and double in C and C++
Possible Duplicate: long double vs double I am unable to understand the difference between between long double and double in C and C++. Can anyone help?

c++ - Double precision - decimal places - Stack Overflow
From what I have read, a value of data type double has an approximate precision of 15 decimal places. However, when I use a number whose decimal representation repeats, such as 1.0/7.0, I find tha...

Correct format specifier for double in printf - Stack Overflow
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.

java - Cast Double to Integer - Stack Overflow
494 A Double is not an Integer, so the cast won't work. Note the difference between the Double class and the double primitive. Also note that a Double is a Number, so it has the method intValue, which you can use to get the value as a primitive int.

What is the difference between "Double" and "double" in Java?
So when should I use Double and when to use double? Thank you @F505 I would recommend double when just doing basic floating point computation. If there is a lot of string conversion needed, then I would use the class Double Some thing important to note, is that a complex data-type Double can be null.

c++ - double and accuracy - Stack Overflow
Using long double I get 18/19 = 0.947368421052631578..., and 947368421052631578 is the repeating decimal. Using double I get 0.947368421052631526... However, the former is correct. Why such an inco...