EXP

• 来源: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgExp
• 最后更新: 2018-04-16

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返回 e 的指定次幂

语法

declare function Exp cdecl ( byval number as double ) as double

用法

result = Exp( number )

参数

number

e 的幂次，类型为 Double。

返回值

返回 e 的 number 次幂，类型为 Double。

说明

数学常数 e（又称欧拉常数）是 Exp 和 Log 函数的底数，是一个无理数和超越数。e 的精确值（保留二十位有效数字）为：2.7182818284590452354。参数 number 可以是函数范围内的任意有效数值表达式。若 number 过大，Exp 返回无穷大；若 number 过小，Exp 返回零（0.0）；若 number 为零，则返回 1.0。number 的精确限制取决于数学处理器。

Exp 可作为运算符重载，以接受用户自定义类型。

示例

'Compute Continuous Compound Interest
Dim r As Double
Dim p As Double
Dim t As Double
Dim a As Double

Input "Please enter the initial investment (principal amount): "; p
Input "Please enter the annual interest rate (as a decimal): "; r
Input "Please enter the number of years to invest: "; t

a = p * Exp ( r * t )
Print ""
Print "After";t;" years, at an interest rate of"; r * 100; "%, your initial investment of"; p; " would be worth";a

输出结果如下：

Please enter the initial investment (principal amount): 100
Please enter the annual interest rate (As a decimal): .08
Please enter the number of years To invest: 20
After 20 years, at an interest rate of 8%, your initial investment of 100 would be worth 495.3032424395115

与 QB 的差异

• 无

另请参阅

• Log
• Operator ^ (Exponentiate)

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