Qt使用正则表达式去掉小数位多余的0

 QRegExp rx;

 rx.setPattern("(\\.){0,1}0+$");

 double double01 = 15648.120000;

 double double02 = 15648.000000

 QString ceshi01 = QString("%1").arg(double01,,'f',-).replace(rx,"");

 QString ceshi02 = QString("%1").arg(double02,,'f',-).replace(rx,"");

碰到需求了，做个笔记