int legalPlayerMove(float moveTo, float moveFrom)
{

    float moveValue=(moveTo-moveFrom);
    cout<<"trace move value"<<moveValue<<endl;


    if(moveValue==(-1.1))
        cout<<"moved up left"<<endl;
    if(moveValue==(-0.9))
        cout<<"moved up right"<<endl;
    if(moveValue!=-1.1||moveValue!=-.9)
        cout<<"that is not a legal move, please renter the square number you wish to move to."<<endl;

    return 0;
}

if(std::numeric_limits<float>::epsilon() + moveValue > 1.1) { // ...
}

#define EPS 0.000001
if(EPS + moveValue > 1.1){..}
...