# Kotlin 程序：将八进制数转换为十进制，反之亦然

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

#### 在此程序中，您将学习使用 Kotlin 中的函数将八进制数转换为十进制数，反之亦然。

## 示例 1：将十进制转换为八进制的程序

```kt
fun main(args: Array<String>) {
    val decimal = 78
    val octal = convertDecimalToOctal(decimal)
    println("$decimal in decimal = $octal in octal")
}

fun convertDecimalToOctal(decimal: Int): Int {
    var decimal = decimal
    var octalNumber = 0
    var i = 1

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

    return octalNumber
}
```

运行该程序时，输出为：

```kt
78 in decimal = 116 in octal
```

此转换发生为：

```kt
8 | 78
8 | 9 -- 6
8 | 1 -- 1
8 | 0 -- 1
(116)

```

* * *

## 示例 2：将八进制转换为十进制的程序

```kt
fun main(args: Array<String>) {
    val octal = 116
    val decimal = convertOctalToDecimal(octal)
    println("$octal in octal = $decimal in decimal")
}

fun convertOctalToDecimal(octal: Int): Int {
    var octal = octal
    var decimalNumber = 0
    var i = 0

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

    return decimalNumber
}
```

When you run the program, the output will be:

```kt
116 in octal = 78 in decimal
```

This conversion takes place as:

```kt
1 * 82 + 1 * 81 + 6 * 80 = 78
```

以下是等效的 Java 代码： [Java 程序：将八进制转换为十进制，反之亦然](/java-programming/examples/octal-decimal-convert "How to convert octal to decimal and vice-versa in Java?")