C++ (Cpp) QStack::toList示例

示例#1

文件： stackshow.cpp 项目： QHossein/calc

void stackShow::Post2In(QStringList &phrase)
{
    static QStack <QString> stack;
    QString r,r1,r2;

    QString l[4]={"+" , "-" , "*" , "/" };

    for (int i=0; i<phrase.size(); i++)
        for (int j=0 ; j<4 ; j++)
        {
            if (phrase.at(i)!=l[j] && j==3)
            {
                stack.push(phrase.at(i));
                ui->lneRes->insert(phrase.at(i) + " ");
                phrase.removeFirst();
                r = phrase.join(" ");
                ui->lneExp->setText(r);
                return;

            }

            else if ( phrase.at(i)==l[j] )
            {
                if (stack.size()<2)
                    return ;

                QStringList t = stack.toList();
                t.removeLast();
                t.removeLast();
                r = t.join(" ");

                r1=stack.pop();
                r2=stack.pop();
                stack.push( "( " + r2 + " " + phrase.at(i) + " " + r1 + " ) ");

                ui->lneRes->setText(  "( " + r2 + " " + phrase.at(i) + " " + r1 + " ) ");
                ui->lneStack->setText( r + " "  "( " + r2 + " " + phrase.at(i) + " " + r1 + " ) ");
                phrase.removeFirst();
                r = phrase.join(" ");
                ui->lneExp->setText(r);
                if (phrase.size()==0)
                    stack.clear();

                return;
            }
        }
}