public static Bignumber GetFactorial(int n)
{
long[] aux2 = { 1 };
Bignumber oneresult = new Bignumber(aux2, aux2.Length);
long[] aux1 = { n };
Bignumber nresult = new Bignumber(aux1, aux1.Length);
if (n == 1)
{
return(oneresult);
}
else
{
return(nresult * GetFactorial(n - 1));
}
/*
* long[] numberaux = new long[1];
* numberaux[0] = n;
* Bignumber number = new Bignumber(numberaux, numberaux.Length);
* for (long i = n-1; i >= 1; i--)
* {
* long[] aux = new long[1];
* aux[0] = i;
* number = number *( new Bignumber(i-1));
* }
* return number;*/
}
public static Bignumber operator *(Bignumber a, Bignumber b)
{
int len1 = a.length;
int len2 = b.length;
long[] result = new long[len1 + len2];
int i_n1 = 0;
int i_n2 = 0;
int i;
for (i = len1 - 1; i >= 0; i--)
{
long carry = 0;
long n1 = a.GetElement(i);
i_n2 = 0;
for (int j = len2 - 1; j >= 0; j--)
{
long n2 = b.GetElement(j);
long sum = n1 * n2 + result[i_n1 + i_n2] + carry;
carry = sum / 10;
// Store result
result[i_n1 + i_n2] = sum % 10;
i_n2++;
}
if (carry > 0)
{
result[i_n1 + i_n2] += carry;
}
i_n1++;
}
long[] auxresult = new long[result.Length];
int k = 0;
for (int m = result.Length - 1; m >= 0; m--)
{
auxresult[k] = result[m];
k++;
}
Bignumber finalresult = new Bignumber(auxresult, auxresult.Length);
return(finalresult);
}
static void Main(string[] args)
{
long[] a = { 1, 2, 3, 4, 5 };
long[] b = { 7, 7, 7 };
int l1 = a.Length;
int l2 = b.Length;
Bignumber a1 = new Bignumber(a, a.Length);
Bignumber b1 = new Bignumber(b, b.Length);
Console.WriteLine(b1 + a1);
Console.WriteLine(b1 * a1);
Console.WriteLine(Fibonacci.GetFibonacci(10));
Console.WriteLine(Factorial.GetFactorial(11));
Console.ReadKey();
}
public static Bignumber GetFibonacci(int n)
{
long[] aux1 = { 0 };
Bignumber zeroresult = new Bignumber(aux1, aux1.Length);
long[] aux2 = { 1 };
Bignumber oneresult = new Bignumber(aux2, aux2.Length);
if (n == 0)
{
return(zeroresult);
}
if (n == 1)
{
return(oneresult);
}
else
{
return(GetFibonacci(n - 1) + GetFibonacci(n - 2));
}
}
public static Bignumber AuxSum(Bignumber a, Bignumber b)
{
int l1 = a.length;
int l2 = b.length;
long[] sum = new long[l1 + 1];
int i = l1 - 1;
int j = l2 - 1;
int k = l1;
long carry = 0;
long s = 0;
while (j >= 0)
{
s = a.GetElement(i) + b.GetElement(j) + carry;
sum[k] = s % 10;
carry = s / 10;
i--;
j--;
k--;
}
while (i >= 0)
{
s = a.GetElement(i) + carry;
sum[k] = s % 10;
carry = s / 10;
i--;
k--;
}
if (carry == 1)
{
sum[0] = 1;
}
Bignumber finalsum = new Bignumber(sum, sum.Length);
return(finalsum);
}
