问题描述
如何在不使用 Convert.To()
方法的情况下以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)
但是我应该使用什么算法来得到这个结果?
我的任务的测试用例:
[TestCase(-3,8,ExpectedResult = "37777777775")]
[TestCase(-127,ExpectedResult = "37777777601")]
[TestCase(-675432,ExpectedResult = "37775330630")]
[TestCase(-1908345,ExpectedResult = "37770560607")]
[TestCase(int.MinValue,ExpectedResult = "20000000000")]
[TestCase(-3,16,ExpectedResult = "FFFFFFFD")]
[TestCase(-127,ExpectedResult = "FFFFFF81")]
[TestCase(-675432,ExpectedResult = "FFF5B198")]
[TestCase(-1908345,ExpectedResult = "FFE2E187")]
[TestCase(int.MinValue,ExpectedResult = "80000000")]
[TestCase(1908345,10,ExpectedResult = "1908345")]
[TestCase(int.MaxValue,ExpectedResult = "2147483647")]
public string GetRadix_Tests(int number,int radix) => number.GetRadix(radix);
解决方法
您可以随时访问 source.dot.net here 上的 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;
(...)