///////    Number.C    ///////
#include "Number.h"
#include <assert.h>

Number& Number::OP =(CS Number& n)  // assignment
{   if (&n == this) return(*this);
    delete(ptr);
    ptr = (&n)->copy();
    return(*this);
}

#define ABS(x)  ((x) < 0 ? -(x) : (x)) 

static unsigned int gcd(int a, int b)
{ int t;
     a = ABS(a);
     b = ABS(b);
     if ( a == 0 ) return(b);    // 0 is error value
     if ( b == 0 ) return(a);
     while ( b > 0 )
     {   t = a % b;
         a = b;
         b = t;
     }
     return (a);
}

Number::Number(int n, int d)  
{   assert(d != 0);
    if ( d < 0 )
    {   n = -n;  d = -d;  } // make d > 0
    int c = gcd(n,d);
    if ( c != 1 )           // remove gcd
    {    n /= c;
         d /= c;
    }
    if ( d == 1 )
        ptr = new Integer(n);
    else
        ptr = new Fraction(n,d);
}