lab4

#include <cctype>
#include <iostream>
#include <cstring>

using namespace std;

class Alpha
{
    private:
        unsigned bin;
    public:
        Alpha() {bin=0;};
        Alpha(Alpha& y) {bin=y.bin;};
        Alpha(char*);
        Alpha operator +(Alpha&);
        Alpha operator -(Alpha&);
        Alpha operator &(Alpha&);
        Alpha operator ~();
        operator char*();
        friend ostream& operator << (ostream&, Alpha&);
};

Alpha::Alpha(char* s)
{
    bin=0;
    while(*s)
    {
        bin |= (1 << (tolower(*s) - 'a'));
        s++;
    }
}

Alpha Alpha::operator + (Alpha& y)
{
    Alpha z;
    z.bin = bin | y.bin;
    return(z);
}

Alpha Alpha::operator - (Alpha& y)
{
    Alpha z;
    z.bin = bin - y.bin;
    return(z);
}


Alpha Alpha::operator & (Alpha& y)
{
    Alpha z;
    z.bin = bin & y.bin;
    return(z);
}

Alpha Alpha::operator ~ ()
{
    Alpha q;
    q.bin = ~bin;
    return(q);
}

ostream& operator << (ostream& out, Alpha& z)
{
    unsigned bit=1;
    int i;
    for(i=27; i>1; i--)
    {
        if((z.bin & bit)>0)
            out<<(char)('a'+i);
        bit=bit<<1;
    }
    return out;
}

Alpha::operator char*()
{
    static char s[32];
    unsigned w=bin;
    int i=0, j=0;
    while(w>0)
    {
        if(w & 1)
            s[j++]='a'+i;
        i++;
        w = w >> 1;
    }
    s[j++]='\n';
    s[j]='\0';
    return (s);
}

int main (int argc, char* argv[])
{
    Alpha x(argv[1]);
    Alpha y(argv[2]);
    Alpha z;
    z=x&y;
    z=x-z;
    z=~z;
    cout<<z<<endl;
}