Thread: Small program using "if" and some variables assistance.

Code:

do {
        cout << "\n";
        cout << "Input s, u, v, a and t: (0 for unknown)\n";
        cin >> s >> u >> v >> a >> t;
        cout << "Which variable do you need?\n";
        cin >> var;

        if ( var=="v" && u!=0 && a!=0 && t!=0 )
            {
                float v=u + a*t;
                cout <<"Final velocity = "<< v <<" m/s\n";
            }
        else if ( var=="v" && u!=0 && a!=0 && s!=0 )
            {
                float v=sqrt( u*u+2*a*s );
                cout <<"Final velocity = "<< v <<" m/s\n";
            }
        else if ( var=="s" && u!=0 && t!=0 && a!=0 )
            {
                float s=u*t + 0.5*a*t*t;
                cout << "Displacement = "<< s <<" m\n";
            }
        else if ( var=="s" && a==0 )
            {
                float s=0.5*(u + v)*t;
                cout << "Displacement = "<< s <<" m\n";
            }
        else
            {
            cout << "Insufficient/Invalid Input!\n";
            }

        }while (1);