Extract int and decimal points from a float

[djm2]

Hi there

I am working with QT creator 2.8.0 and I am trying to split up a value to be processed. I have a floating point value say for example 12.34567 and I want to extract the 12 part and the 34567 part separately. I will then use the two values in the rest of my code. Can anyone point me in the right direction? I saw this post - http://qt-project.org/forums/viewthread/12441 but it doesn't seem to like it. I know its an easy question but I am a newbie.

Thanks

[stampede]

One solution is to convert the value to string and split it by '.' (dot) character:

const float value = 3.141592;
const int precision = 6;
const QString string = QString::number(value,'g',precision);
const QStringList splitted = string.split('.');
qDebug() << splitted;
// should output ("3","141592"), you can then convert them to integer values with QString::toInt method

const float value = 3.141592;
const int precision = 6;
const QString string = QString::number(value,'g',precision);
const QStringList splitted = string.split('.');
qDebug() << splitted;
// should output ("3","141592"), you can then convert them to integer values with QString::toInt method

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.
Another way is to operate on the float value itself, in order to extract the largest integer not greater than given value - a definition of the "floor" function :

const float value = 3.141592;
const int x = floor(value);
const float y = value-x;
// x == 3;
// y ~= 0.141592

const float value = 3.141592;
const int x = floor(value);
const float y = value-x;
// x == 3;
// y ~= 0.141592

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