如何在不使用convert.to（）方法的情况下将基数10负数转换为基数8转换？

Question

不使用convert.to()方法，如何用八进制表示十进制负数？

public static string GetOctal(int number)
{     
   int base = 8;    
}

例如：

-3（基数10）=37777777775（基数8）

但是我应该用什么算法得到这个结果呢？

这些是我的任务的测试用例：

        [TestCase(-3, 8, ExpectedResult = "37777777775")]
        [TestCase(-127, 8, ExpectedResult = "37777777601")]
        [TestCase(-675432, 8, ExpectedResult = "37775330630")]
        [TestCase(-1908345, 8, ExpectedResult = "37770560607")]
        [TestCase(int.MinValue, 8, ExpectedResult = "20000000000")]
        [TestCase(-3, 16, ExpectedResult = "FFFFFFFD")]
        [TestCase(-127, 16, ExpectedResult = "FFFFFF81")]
        [TestCase(-675432, 16, ExpectedResult = "FFF5B198")]
        [TestCase(-1908345, 16, ExpectedResult = "FFE2E187")]
        [TestCase(int.MinValue, 16, ExpectedResult = "80000000")]
        [TestCase(1908345, 10, ExpectedResult = "1908345")]
        [TestCase(int.MaxValue, 10, ExpectedResult = "2147483647")]
        public string GetRadix_Tests(int number, int radix) => number.GetRadix(radix);

Answer 1

您始终可以在此处找到source.dot.NET中的Convert类的源代码，并遵循Parsenumber的IntToString方法：

public static string IntToString(int n, int radix, int width, char paddingChar, int flags)
{
    Span<char> buffer = stackalloc char[66]; // Longest possible string length for an integer in binary notation with prefix

    if (radix < MinRadix || radix > MaxRadix)
        throw new ArgumentException(SR.Arg_InvalidBase, nameof(radix));

    // If the number is negative, make it positive and remember the sign.
    // If the number is MIN_VALUE, this will still be negative, so we'll have to
    // special case this later.
    bool isNegative = false;
    uint l;
    if (n < 0)
    {
        isNegative = true;
    (...)