public Form1()
{
InitializeComponent();
BigNum a = new BigNum("122");
BigNum b = new BigNum("112");
BigNum c = a - b;
FenJ(new BigNum(15));
}
BigNum J(BigNum z)
{
BigNum ans = new BigNum(1);
for (BigNum i = new BigNum(1); i < z + 1; i += 1)
{
ans *= new BigNum(i.GetValue());
FenJ(i);
}
return(ans);
}
private void button1_Click(object sender, EventArgs e)
{
ZL = new List <int>();
BigNum A = new BigNum(textBox1.Text);
BigNum AJ = J(A);
BigNum AK = K(AJ);
textBox2.Text = AJ.GetValue();
textBox3.Text = AK.GetValue();
textBox4.Text = ZL.Count.ToString();
}
public static BigNum operator -(BigNum a, BigNum b)
{
BigNum c = new BigNum(0);
if (a < b)
{
BigNum temp;
temp = new BigNum(a.GetValue());
a = new BigNum(b.GetValue());
b = new BigNum(temp.GetValue());
return(new BigNum(-1));
}
a.Value.Reverse();
b.Value.Reverse();
while (a.Value.Count < b.Value.Count)
{
a.Value.Add(0);
}
while (a.Value.Count > b.Value.Count)
{
b.Value.Add(0);
}
while (c.Value.Count < a.Value.Count)
{
c.Value.Add(0);
}
double carry = 0;
for (int i = 0; i < a.Value.Count; i++)
{
c.Value.Add(0);
double temp = 0;
temp = a.Value[i] - carry - b.Value[i]; //a-b-c
carry = (temp < 0 ? 1 : 0); //<0就借位
c.Value[i] = temp;
}
c.Value.Reverse();
BigNum ans = new BigNum();
bool flag = false;
foreach (var item in c.Value)
{
if (item != 0)
{
flag = true;
}
if (flag)
{
ans.Value.Add(item);
}
}
return(ans);
}
public static bool operator <(int b, BigNum a)
{
BigNum bb = new BigNum(b);
if (bb < a)
{
return(true);
}
else
{
return(false);
}
}
public static BigNum operator +(BigNum a, BigNum b)
{
a.Value.Reverse();
b.Value.Reverse();
while (a.Value.Count < b.Value.Count)
{
a.Value.Add(0);
}
while (a.Value.Count > b.Value.Count)
{
b.Value.Add(0);
}
BigNum c = new BigNum();
while (c.Value.Count < a.Value.Count + 1)
{
c.Value.Add(0);
}
double carry = 0;
for (int i = 0; i < a.Value.Count; i++)
{
double temp = a.Value[i] + b.Value[i] + carry;
carry = Math.Floor(temp / 10);
c.Value[i] += temp % 10;
}
c.Value[c.Value.Count - 1] += carry;
c.Value.Reverse();
BigNum ans = new BigNum();
bool flag = false;
foreach (var item in c.Value)
{
if (item != 0)
{
flag = true;
}
if (flag)
{
ans.Value.Add(item);
}
}
return(ans);
}
void FenJ(BigNum z)
{
int a = int.Parse(z.GetValue().ToString());
if (a == 2)
{
ZL.Add(2);
return;
}
if (a < 2)
{
return;
}
if (a == 2)
{
ZL.Add(2);
}
int count = 2;
while (a != 1)
{
while (true)
{
if (a % count == 0)
{
ZL.Add(count);
a /= count;
}
else
{
break;
}
}
count++;
}
}
