Hi all, In may app I have a double variable: double d; When the result of 10^6 goes to that variable, it shows it this way: 1e+06 How to do to make the app show the result in decimal , 1000000 ?

@ tomy said in Showing numbers in decimal not scientific notation : I run it in standard mode (ctrl + R). That's not what I... ugh, nevermind. So you say you're using QTextStream. Ok, so you have a code similar to this right? QTextStream foo = ...; double bar = ...; foo << bar; If that's the case then you can do it in a couple of ways: Switch the stream serialization mode for floating numbers to fixed notation: QTextStream foo = ...; foo.setRealNumberNotation(QTextStream::FixedNotation); double bar = ...; foo << bar; or pre-format the number the way you want it and pass the resulting string to the stream: QTextStream foo = ...; double bar = ...; foo << QString::number(bar, 'f');

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Showing numbers in decimal not scientific notation

Unsolved General and Desktop

41 Posts 9 Posters 31.4k Views 5 Watching

J J.Hilk
Hi,

for your specific situation, I would suggest something like:
```
QString truncValue(double value, int prec)
{
    QString sReturn = QString::number(value,'f',prec);
    if(sReturn.endsWith("0")){
        while(sReturn.endsWith("0"))
            sReturn.remove(sReturn.length()-1,1);

        if(sReturn.endsWith("."))
            sReturn.remove(sReturn.length()-1,1);
    }
    
    return sReturn;
}
```
But, this is successively chaining a lot of string operations. The previously mentions methods are probably better.
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T Offline
tomy

wrote on last edited by

#41

@J.Hilk
Thank you for the code.
honestly, I solved the issue two or three days ago. When I found I can't rely on a function offered by Qt on this specific problem, I returned to my old friend, C++, and solved the issue using it.
But I appreciate your paying attention to the problem.
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