else if (R3==0 && !C3){     //addition key A
            tempOne = tableToNum();
            pFlag = 1;

            table[0]=0;
            table[1]=0;
            table[2]=0;
            table[3]=0;
        }
        else if (R3==0 && !C4){     //subtraction key B
            tempOne = tableToNum();
            sFlag = 1;
            table[0]=0;
            table[1]=0;
            table[2]=0;
            table[3]=0;
        }
    }