# Kotlin 程序：将二进制数转换为八进制，反之亦然

> 原文： [https://www.programiz.com/kotlin-programming/examples/binary-octal-convert](https://www.programiz.com/kotlin-programming/examples/binary-octal-convert)

#### 在此程序中，您将学习使用 Kotlin 中的函数将二进制数转换为八进制数，反之亦然。

## 示例 1：将二进制转换为八进制的程序

在此程序中，我们将首先将二进制数转换为十进制。 然后，十进制数字转换为八进制。

```kt
fun main(args: Array<String>) {
    val binary: Long = 101001
    val octal = convertBinarytoOctal(binary)
    println("$binary in binary = $octal in octal")
}

fun convertBinarytoOctal(binaryNumber: Long): Int {
    var binaryNumber = binaryNumber
    var octalNumber = 0
    var decimalNumber = 0
    var i = 0

    while (binaryNumber.toInt() != 0) {
        decimalNumber += (binaryNumber % 10 * Math.pow(2.0, i.toDouble())).toInt()
        ++i
        binaryNumber /= 10
    }

    i = 1

    while (decimalNumber != 0) {
        octalNumber += decimalNumber % 8 * i
        decimalNumber /= 8
        i *= 10
    }

    return octalNumber
}
```

运行该程序时，输出为：

```kt
101001 in binary = 51 in octal
```

此转换发生为：

```kt
Binary To Decimal
1 * 25 + 0 * 24 + 1 * 23 + 0 * 22 + 0 * 21 + 1 * 20 = 41

Decimal to Octal
8 | 41
8 |5 -- 1
8 |0 -- 5
(51)

```

* * *

## 示例 2：将八进制转换为二进制的程序

在此程序中，八进制数首先从十进制到十进制。 然后，将十进制数转换为二进制数。

```kt
fun main(args: Array<String>) {
    val octal = 67
    val binary = convertOctalToBinary(octal)
    println("$octal in octal = $binary in binary")
}

fun convertOctalToBinary(octalNumber: Int): Long {
    var octalNumber = octalNumber
    var decimalNumber = 0
    var i = 0
    var binaryNumber: Long = 0

    while (octalNumber != 0) {
        decimalNumber += (octalNumber % 10 * Math.pow(8.0, i.toDouble())).toInt()
        ++i
        octalNumber /= 10
    }

    i = 1

    while (decimalNumber != 0) {
        binaryNumber += (decimalNumber % 2 * i).toLong()
        decimalNumber /= 2
        i *= 10
    }

    return binaryNumber
}
```

运行该程序时，输出为：

```kt
67 in octal = 110111 in binary
```

This conversion takes place as:

```kt
Octal To Decimal
6 * 81 + 7 * 80 = 55

Decimal to Binary
2 | 55
2 | 27 -- 1
2 | 13 -- 1
2 | 6 -- 1
2 | 3 -- 0
2 | 1 -- 1
2 |0  -- 1
(110111)

```

以下是等效的 Java 代码： [Java 程序：将二进制转换为八进制，反之亦然](/java-programming/examples/binary-octal-convert "Java Program to Convert Binary to Octal and vice-versa")