“double triple quatra penta hexa.”这些都是英文的倍数的固有写法，从double一直到10倍的写法如下： 2倍double、3倍triple、4倍quatra、5倍penta、6倍hexa、7倍hepta、8倍octa、9. 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. 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.
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