【Qt开发】 数字转QString格式化

QString b=QString("%1").arg(i, 3, 10, QChar('0'));   

QStringList list;  
    for(int i=0;i<128;i++)  
    {  
        list.append(QString("%1").arg(i, 3, 10, QChar('0')));  
    }  

输出为

("000", "001", "002", "003", "004", "005", "006", "007"...<span style="font-family: Arial, Helvetica, sans-serif;">"120", "121", "122", "123", "124", "125", "126", "127")

2  3.456789转QString保留3位小数

double d = 3.123124;  
 QString s=QString::number(d,'f',3);  
 qDebug()<<s;  

输出为："3.123"