bool Switch[6];      // An array of six switch status bools

SetOutputLow(P1);    // Setting P1 output low allows reading of P2 and P3.
SetInputPullup(P2);
SetInputPullup(P3);
Switch[0] = Read(P2);
Switch[1] = Read(P3);

SetOutputLow(P2);    // Setting P2 output low allows reading of P1 and P3.
SetInputPullup(P1);
SetInputPullup(P3);
Switch[2] = Read(P1);
Switch[3] = Read(P2);

SetOutputLow(P3);    // Setting P3 output low allows reading of P1 and P2.
SetInputPullup(P1);
SetInputPullup(P3);
Switch[4] = Read(P1);
Switch[5] = Read(P3);