how can I find number of lines in QTextedit ?

[newplayer]

I need make a loop which will be making until end of QTextEdit so I need know hom many lines somebody wrote in QTextEdit.

I tried:

for(int i=0; i<textedit.lines(); i++)
{
 
}

for(int i=0; i<textedit.lines(); i++)
{

}

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and:

for(int i=0; i<textedit.count(); i++)
{
 
}

for(int i=0; i<textedit.count(); i++)
{

}

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but it doesn't work