Super Calculator assignment

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C++

calculator

For my programming class I need to make a super calculator that allows me to multiply, divide, add, subtract, compare, and calculate factorials of big numbers. I got the code to compile without errors and everything works except for the compare function. When I input two numbers and make "compare" my operation, the calculator outputs the first number I input. Any suggestions with this?

Thank you!!

Updated: Made the compare function an int instead of a void function and changed some lines around in the input function that weren't in the right spots, this is why I wasn't getting any output from the calculator. Now everything works except the compare function's output isn't working correctly.

struct BigNumber
{   int * digitos;
    int size;
    bool pos;
    BigNumber()
   { digitos = new int[1];
     digitos [0] = 0;
     size = 1;
     pos = true;
   }

int Compare(BigNumber b)  
{
    if(pos && !b.pos)
      return 1;
    if(!pos && b.pos)
      return -1;
    if(size > b.size)
      return 1;
    else if(b.size > size)
      return -1;
    for(int i = size-1; i >= 0; i--)
       {
         if(digitos[i]>b.digitos[i])
           {
              if(pos)
                return 1;
              else
                return -1;
           }   
         else if(b.digitos[i] > digitos[i])
           { 
              if( pos)
                return -1;
              else
                return 1;
           }
       }
    return 0;
}       

void input()
{  string n1, n2, op;
    while (true)
  {
     cout << "1st #? ";
     cin >> n1;
     cout<< "2nd #? ";
     cin >> n2;
     cout << "Operation? ";
     cin >> op;
     BigNumber a,b;
     a.set(n1);
     b.set(n2);
     if (op == "+")
        {  if (a.pos && b.pos)
              a.Add(b);
           else if (a.pos)
              a.Subtract(b);
           else if (b.pos)
              b.Subtract(a);
           else
              a.Add(b);
        } //both are negative
     if (op == "-")
        {  if (a.pos && b.pos)
              a.Subtract(b);
           else if (a.pos)
              a.Add(b);
           else if (b.pos)
           {  a.Add(b);
           a.pos = false;}
           else
           {  a.Subtract(b);
              a.pos = !a.pos;}
     }
     if (op == "*")
     {  int B = toInt(n2);
        a.Multiply(B);
     }
     if (op == "/")
     {  int B = toInt(n2);
        a.Divide(B);
     }
     if (op == "!")
     {
        a.Factorial(toInt(n1));
     }
      if (op == "Compare")
      {
         a.Compare(b);
      }
    a.print();
    cout << "\n";}
}
    
void main()
{
input();
}