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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. 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. 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. Note the difference between the double class and the double primitive 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. 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。 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.
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 The long double function prototypes are identical to the prototypes for their double counterparts, except that the longdouble data type replaces the double data type The long double versions of these functions should not be used in new code.
494 a double is not an integer, so the cast won't work
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