191问答库 > vb中的double双精度是什么意思？

vb中的double双精度是什么意思？

2025-03-17 04:13:06
推荐回答（1个）
回答1：

和双精度类似的还有单精度,它们都是浮点类型

单精度型变量占用4个字节,能表示范围是-3.4*10^38 ~~3.4*10^38的数，有效位为7位
双精度型变量占用8个字节,能表示范围是-1.7*10^308 ~~1.7*10^308的数,有效位为15位

双精度与单精度可以理解为一种叫法~
硬要说理由的话~这类的变量提供的高精度的数值,如圆周率用整型表示只能显示3,用单精度型就可以显示为3.141592,双精度就显示3.1415926535...XX,共15位数字

明白没?

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