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QString and onversion in binary, decimal and hex

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mrdebug

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Monday, February 14th 2011, 10:18am

QString and onversion in binary, decimal and hex

Dear users, I have a simple question for you on a problem that I don't understood.
See the explaination:

This code:

PHP Source code

 
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char a= 95;
qDebug() << QString::number(a, 2)+ " "+ QString::number(a, 10)+ " "+ QString::number(a, 16);

return

PHP Source code

 
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"1011111 95 5f"


but this

PHP Source code

 
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a= 156;
qDebug() << QString::number(a, 2)+ " "+ QString::number(a, 10)+ " "+ QString::number(a, 16);

return

PHP Source code

 
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"1111111111111111111111111111111111111111111111111111111110011100 -100 ffffffffffffff9c" 


Why QString::number(a, 10) doe not return "156" instead of "-100"?

alexisdm

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Monday, February 14th 2011, 5:23pm

"signed char" have their values between -128 and +127. See wikipedia.
So 156 is really -100 inside a signed char, and that -100 value is converted to 64bits in your case.

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