Example 1:

qDebug()& lt； & lt "Output debugging"; //Output content: "Output debugging"

Example 2:

int a = 1；

qDebug()& lt； & lta； //Output content: 1

Example 3:

QRect rect(0，0，0，0)；

qDebug()& lt； & ltrect// Output content: qrect (0,0,0,0)

This output is very general, it can output many formats and many classes.