static void Main(string[] args)
{
while (true)
{
Console.ForegroundColor = ConsoleColor.DarkGreen;
string a = Console.ReadLine();
string b = Console.ReadLine();
Biginteger q = new Biginteger(a);
Biginteger w = new Biginteger(b);
Biginteger e = q + w;
Biginteger r = q * w;
Biginteger t = q - w;
Console.ForegroundColor = ConsoleColor.DarkYellow;
Console.WriteLine(e);
Console.WriteLine(r);
Console.WriteLine(t);
ConsoleKeyInfo k = Console.ReadKey();
if (k.Key == ConsoleKey.Enter)
{
Console.Clear();
}
else
{
break;
}
}
}
public static Biginteger operator -(Biginteger a, Biginteger b)
{
if (a.s[0] == '-' && b.s[0] == '-')
{
string f = b.s.Remove(0, 1);
Biginteger bm2 = new Biginteger(f);
string h = a.s.Remove(0, 1);
Biginteger am2 = new Biginteger(h);
return(bm2 - am2);
}
else if (a.s[0] == '-')
{
string f = b.s.Insert(0, "-");
Biginteger bm2 = new Biginteger(f);
return(a + bm2);
}
else if (b.s[0] == '-')
{
string f = b.s.Remove(0, 1);
Biginteger bm2 = new Biginteger(f);
return(a + bm2);
}
string ans = "";
bool minus = true;
int start = 0;
int adder = 0;
int[] aa = new int[Math.Max(a.s.Length, b.s.Length)];
int[] bb = new int[Math.Max(a.s.Length, b.s.Length)];
int[] cc = new int[Math.Max(a.s.Length, b.s.Length)];
for (int i = 0; i < aa.Length; i++)
{
aa[i] = 0;
bb[i] = 0;
}
if (a.s.Length >= b.s.Length)
{
for (int i = 0; i < a.s.Length; i++)
{
aa[i] = a.s[i] - 48;
}
for (int i = a.s.Length - b.s.Length; i < a.s.Length; i++)
{
bb[i] = b.s[i - a.s.Length + b.s.Length] - 48;
}
}
else
{
for (int i = 0; i < b.s.Length; i++)
{
bb[i] = b.s[i] - 48;
}
for (int i = b.s.Length - a.s.Length; i < b.s.Length; i++)
{
aa[i] = a.s[i - b.s.Length + a.s.Length] - 48;
}
}
for (int i = 0; i < cc.Length; i++)
{
cc[i] = aa[i] - bb[i];
}
for (int i = 0; i < cc.Length; i++)
{
if (cc[i] == 0 && i == cc.Length - 1)
{
Biginteger t = new Biginteger("0");
return(t);
}
else if (cc[i] == 0)
{
continue;
}
else if (cc[i] > 0)
{
minus = false;
start = i;
break;
}
else
{
minus = true;
start = i;
break;
}
}
if (minus == false)
{
for (int i = cc.Length - 1; i >= start; i--)
{
int k = cc[i];
cc[i] = (cc[i] + adder + 10) % 10;
if (k + adder < 0)
{
adder = -1;
}
else
{
adder = 0;
}
}
}
else
{
for (int i = 0; i < cc.Length; i++)
{
cc[i] = bb[i] - aa[i];
}
for (int i = cc.Length - 1; i >= start; i--)
{
int k = cc[i];
cc[i] = (cc[i] + adder + 10) % 10;
if (k < 0)
{
adder = -1;
}
else
{
adder = 0;
}
}
}
for (int i = 0; i < cc.Length; i++)
{
ans += (char)(cc[i] + 48);
}
while (true)
{
if (ans[0] == '0')
{
ans = ans.Remove(0, 1);
}
else
{
break;
}
}
if (minus == true)
{
ans = ans.Insert(0, "-");
}
Biginteger x = new Biginteger(ans);
return(x);
}
public static Biginteger operator +(Biginteger a, Biginteger b)
{
bool minus = false;
string f;
string h;
if (a.s[0] == '-' && b.s[0] == '-')
{
minus = true;
f = a.s.Remove(0, 1);
h = b.s.Remove(0, 1);
}
else if (a.s[0] == '-')
{
string l = a.s.Remove(0, 1);
Biginteger a2 = new Biginteger(l);
return(b - a2);
}
else if (b.s[0] == '-')
{
string l = b.s.Remove(0, 1);
Biginteger b2 = new Biginteger(l);
return(a - b2);
}
else
{
f = a.s;
h = b.s;
}
int add = 0;
string ans = "";
int[] aa = new int[Math.Max(f.Length, h.Length)];
int[] bb = new int[Math.Max(f.Length, h.Length)];
int[] cc = new int[Math.Max(f.Length, h.Length)];
for (int i = 0; i < aa.Length; i++)
{
aa[i] = 0;
bb[i] = 0;
}
if (f.Length >= h.Length)
{
for (int i = 0; i < f.Length; i++)
{
aa[i] = f[i] - 48;
}
for (int i = f.Length - h.Length; i < f.Length; i++)
{
bb[i] = h[i - f.Length + h.Length] - 48;
}
}
else
{
for (int i = 0; i < h.Length; i++)
{
bb[i] = h[i] - 48;
}
for (int i = h.Length - f.Length; i < h.Length; i++)
{
aa[i] = f[i - h.Length + f.Length] - 48;
}
}
for (int i = 0; i < aa.Length; i++)
{
cc[i] = aa[i] + bb[i];
}
for (int i = cc.Length - 1; i >= 0; i--)
{
cc[i] = (cc[i] + add) % 10;
add = (aa[i] + bb[i] + add) / 10;
}
if (add != 0)
{
ans += (char)(add + 48);
}
for (int i = 0; i < cc.Length; i++)
{
ans += (char)(cc[i] + 48);
}
if (minus == true)
{
ans = ans.Insert(0, "-");
}
Biginteger x = new Biginteger(ans);
return(x);
}
public static Biginteger operator *(Biginteger a, Biginteger b)
{
string f = a.s;
string h = b.s;
bool minus = false;
if (a.s[0] == '-' && b.s[0] == '-')
{
f = a.s.Remove(0, 1);
h = b.s.Remove(0, 1);
}
else if (a.s[0] == '-')
{
f = a.s.Remove(0, 1);
h = b.s;
minus = true;
}
else if (b.s[0] == '-')
{
h = b.s.Remove(0, 1);
f = a.s;
minus = true;
}
if (a.s == "0" || b.s == "0")
{
Biginteger q = new Biginteger("0");
return(q);
}
int add = 0;
string ans = "";
int[] aa = new int[f.Length];
int[] bb = new int[h.Length];
int[] cc = new int[f.Length + h.Length];
for (int i = 0; i < f.Length; i++)
{
aa[i] = f[f.Length - 1 - i] - 48;
}
for (int i = 0; i < h.Length; i++)
{
bb[i] = h[h.Length - 1 - i] - 48;
}
for (int i = 0; i < cc.Length; i++)
{
cc[i] = 0;
}
for (int i = 0; i < bb.Length; i++)
{
for (int j = 0; j < aa.Length; j++)
{
cc[i + j] += aa[j] * bb[i];
}
}
for (int i = 0; i < cc.Length; i++)
{
int k = cc[i];
cc[i] = (cc[i] + add) % 10;
add = (k + add) / 10;
}
for (int i = cc.Length - 1; i >= 0; i--)
{
ans += (char)(cc[i] + 48);
}
while (true)
{
if (ans[0] == '0')
{
ans = ans.Remove(0, 1);
}
else
{
break;
}
}
if (minus == true)
{
ans = ans.Insert(0, "-");
}
Biginteger x = new Biginteger(ans);
return(x);
}
