Qt 계산기 간단한듯 복잡하네요 고수형들 봐주세요 ㅠㅠ

QStringList strListPlus = strBuf.split("+");
        double numsP[256] = {0x00, };
        double numsM[256] = {0x00, };
        double result = 0;
        int countP = 0;
        int countM = 0;
 
        for(int n=0; n<strListPlus.count(); n++)
        {
            QString temp1 = strListPlus.at(n);
            QStringList strListMinus = temp1.split("-");
 
            countP = 0;
            for(int nn=0; nn<strListMinus.count(); nn++)
            {
                QString temp2 = strListMinus.at(nn);
                numsP[countP++] = temp2.toDouble();
            }
 
            if(countP == 0)
            {
                numsM[countM] = temp1.toDouble();
            }
            else
            {
                for(int nn=0; nn<countP; nn++)
                {
                    if(nn == 0)
                    {
                        numsM[countM] = numsP[nn];
                    }
                    else
                    {
                        numsM[countM] -= numsP[nn];
                    }
                }
            }
 
            countM++;
        }
 
        for(int n=0; n<countM; n++)
        {
            result += numsM[n];
        }
 
        strBuf.sprintf("%.2f", result);
 
    }