qt时间处理的问题

[policezdw]

各位大神，请问如下代码中，为什么 “qDebug() << "time = " << time;”打印time的时候，time的值一直都不变呢？

void Widget::display_info_x_time(qint64 mSec_value,QByteArray send_msg)
{
    int i = 0;
    int j = 0;
    double time = mSec_value/1000;
    double time_increase = 1/200;

    //QVector
    QVector<double> key(200),value(200);
    for(j = 0 ; j < 200 ; ++j)
    {
        //时间存入key
        time += time_increase;
        qDebug()  << "time = " << time;
        key.push_back(time);

    }