C++ Qt - 将浮点数转换为 QString
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Qt - Converting float to QString
提问by thnkwthprtls
This seems like it should be very simple, but I'm going through the docs and not seeing anything. I just need to convert a number that is represented as a floatobject into a QStringobject. I know there is the function QString::number()that can be used for other types like intand double, like so:
int a = 1;
QString b = QString::number(a);
这看起来应该很简单，但我正在浏览文档并没有看到任何东西。我只需要将表示为float对象的数字转换为QString对象。我知道有一个函数QString::number()可以用于其他类型，比如intand double，如下所示：
int a = 1;
QString b = QString::number(a);
...however this doesn't seem to work for float. Perhaps there is some way where it is converted first from floatto another type, and then from that type to QString? If anyone has any ideas I'd appreciate it. Thanks!
...但是这似乎不适用于float. 也许有某种方法可以先将它从转换float为另一种类型，然后再从该类型转换为QString? 如果有人有任何想法，我将不胜感激。谢谢！
回答by ratchet freak
floatwill auto-promote to doublewhen needed
float将double在需要时自动升级
float pi = 3.14;
QString b = QString::number(pi);
should work
应该管用
otherwise you can use setNum:
否则你可以使用 setNum：
float pi = 3.14;
QString b;
b.setNum(pi);
