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QString QString::arg(qulonglong a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char(’ ')) const
a:数字
fieldWidth:最小长度
base : 进制
fillChar:位数不足时填充的字符
//qulonglong number = ui->Number_lineEdit->text().toULongLong();
qulonglong number = 72084448862;
QString str = QString("%1").arg(number,12
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