qstring转double精度

回答: 当将QString转换为double时，精度不会丢失。实际上，问题可能出现在使用qDebug打印时。qDebug对于double类型只显示6位数字。如果想要打印所有数字，可以使用qSetRealNumberPrecision函数来设置精度。例如，可以使用以下代码来打印更高精度的double值:

QString val = "123.456789";
qDebug() << qSetRealNumberPrecision(10) << val.toDouble(); \[3\]
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