Qdebug() print debugging information

qDebug() Print debug information , The console application will print to the console .

#include <QDebug>

	int num = 255;
    qDebug(" Decimal system : %d", num);     // Decimal output 
    qDebug(" octal : %o", num);     // Octal output 
    qDebug(" Hexadecimal : %x",num);     // Hexadecimal output 

    qreal PI = 3.14;
    qDebug(" PI : %f", PI);      // Floating point output 

    qreal price = 50000;
    qDebug(" housing price : %e", price);     // Scientific counting outputs 

    int rate = 75;
    qDebug(" Alcohol concentration : %d%%", rate); // %  Output 


    QString str = " Frenchman Zhang San ";
    qDebug() << str;                // Double quotation marks are displayed by default when outputting 
    qDebug().noquote() << str;      // Output without double quotation marks 
    qDebug().quote() << str;        // Display double quotation marks on output 

    qDebug() <<"["<<" Zhang San "<<"]";          // By default, spaces are displayed when outputting  "[  Zhang San  ]"
    qDebug().nospace()<<"["<<" Zhang San "<<"]"; // Output without spaces  "[ Zhang San ]"
    qDebug().space() <<"["<<" Zhang San "<<"]";  // Display spaces on output  "[  Zhang San  ]"

Output results