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some adding to the big integer (DOESNT WORK)

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That-One-Nerd 2023-04-24 07:15:26 -04:00
parent af4ed70add
commit 12ae678e86
1 changed files with 68 additions and 6 deletions
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74
Nerd_STF/Mathematics/BigInteger.cs
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@ -1,6 +1,4 @@
using System.Numerics;
namespace Nerd_STF.Mathematics;
namespace Nerd_STF.Mathematics;
public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger>, IClamp<BigInteger>,
IComparable<BigInteger>, IComparable<byte>, IComparable<sbyte>, IComparable<short>, IComparable<ushort>,
@ -15,6 +13,10 @@ public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger
public static BigInteger One => new(false, new byte[] { 1 });
public static BigInteger Zero => new(false, Array.Empty<byte>());
public bool IsNegative => p_sign;
public bool IsPositive => !p_sign;
public int Length => p_data.Length;
public int Sign => p_sign ? -1 : 1;
private readonly byte[] p_data;
@ -111,10 +113,9 @@ public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger
public int CompareTo(decimal other) => CompareTo((BigInteger)other);
public int CompareTo(BigInteger other)
{
int compare = p_sign.CompareTo(other.p_sign);
if (compare != 0) return compare;
if (p_sign ^ other.p_sign) return p_sign ? -1 : 1;
compare = p_data.Length.CompareTo(other.p_data);
int compare = p_data.Length.CompareTo(other.p_data.Length);
if (compare != 0) return compare;
for (int i = p_data.Length - 1; i >= 0; i--)
@ -168,6 +169,22 @@ public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger
Array.Copy(p_data, data, Mathf.Min(p_data.Length, bytes));
return data;
}
private int CompareAbs(BigInteger other)
{
// TODO: replace with a slightly generalized public method.
int compare = p_data.Length.CompareTo(other.p_data.Length);
if (compare != 0) return compare;
for (int i = p_data.Length - 1; i >= 0; i--)
{
compare = p_data[i].CompareTo(other.p_data[i]);
if (compare != 0) return compare;
}
return 0;
}
private byte[] TrimmedData()
{
int start = 0;
@ -175,6 +192,15 @@ public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger
return p_data.Skip(start).ToArray();
}
public static BigInteger Absolute(BigInteger val) => new(false, val.p_data);
public static BigInteger Max(params BigInteger[] vals)
{
if (vals.Length < 1) return Zero;
BigInteger val = vals[0];
foreach (BigInteger b in vals) val = b > val ? b : val;
return val;
}
public static bool operator ==(BigInteger a, BigInteger b) => a.Equals(b);
public static bool operator !=(BigInteger a, BigInteger b) => !a.Equals(b);
public static bool operator >(BigInteger a, BigInteger b) => a.CompareTo(b) > 0;
@ -206,4 +232,40 @@ public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger
public static explicit operator float(BigInteger val) => val.ToInt32();
public static explicit operator double(BigInteger val) => val.ToInt64();
public static explicit operator decimal(BigInteger val) => val.ToInt64();
public static BigInteger operator +(BigInteger a, BigInteger b)
{
// Add padding to integer data to keep lists the same size.
int desiredLength = Mathf.Max(a.Length, b.Length) + 1;
List<byte> dataA = new(a.p_data),
dataB = new(b.p_data),
dataC = new();
while (dataA.Count < desiredLength) dataA.Add(0x00);
while (dataB.Count < desiredLength) dataB.Add(0x00);
// Add the data of A and B from left to right. Roll over remainders.
sbyte remainder = 0;
byte result;
for (int i = 0; i < desiredLength - 1; i++)
{
short sum = (short)(dataA[i] * a.Sign + dataB[i] * b.Sign + remainder);
remainder = (sbyte)(sum >> 8);
result = (byte)(sum & 0xFF);
dataC.Add(result);
}
dataC.Add((byte)Math.Abs(remainder)); // Add the remainder for the last addition.
bool sign;
if (!(a.p_sign ^ b.p_sign)) sign = a.p_sign;
else
{
bool aBigger = Absolute(a) > Absolute(b);
if (aBigger) sign = a.p_sign;
else sign = b.p_sign;
}
return new(sign, dataC.ToArray());
}
}