注: macosx下要加上 #include <QIODevice> //for macosx
endl替换为Qt::endl;
示例源码:
#include <QCoreApplication>标签:实战,Qt5.12,符号,int,数据类型,unsigned,long,signed,type From: https://blog.51cto.com/remotedev/6132573
#include <QDebug>
#include <QTextStream>
static QTextStream cout (stdout,QIODevice::WriteOnly);
#include <iostream>
#include <QtGlobal>
void test()
{
qDebug() << "HelloWorld-qdebug";
cout << "Helloword-QTextStream" <<endl;
std::cout<<"Helloword-std::cout"<<std::endl;
}
void test_types()
{
qint8 signed_char_type;//signed char 有符号8bit
qint16 signed_short_type;//signed short 有符号16bit
qint32 signed_int_type;//signed int 有符号32bit
qint64 signed_long_long_int_type;//signed long long int 有符号64bit
qDebug() <<"sizeof(qint8)=" <<sizeof (signed_char_type)
<<"sizeof(qint16)=" <<sizeof (signed_short_type)
<<"sizeof(qint32)=" <<sizeof(signed_int_type)
<<"sizeof(qint64)=" <<sizeof (signed_long_long_int_type)<<endl;;
qptrdiff qint32_or_qint64_type;//32位系统 qint32 64位系统 qint64
qreal double_or_float_type;//默认是double,如果加上-qreal float选项,那么是float
qintptr same_as_qptrdiff;//32位系统 qint32 64位系统 qint64
quintptr quint32_or_quint64_type;//32位系统 quint32 64位系统 quint64
qDebug() <<"sizeof(qptrdiff)=" <<sizeof (qint32_or_qint64_type)
<<"sizeof(qreal)=" <<sizeof (double_or_float_type)
<<"sizeof(qintptr)=" <<sizeof(same_as_qptrdiff)
<<"sizeof(quintptr)=" <<sizeof (quint32_or_quint64_type)<<endl;
quint8 unsigned_char_type;//unsigned char 无符号8bit
quint16 unsigned_short_type;//unsigned short 无符号16bit
quint32 unsigned_int_type;//unsigned int 无符号32bit
quint64 unsigned_long_long_int_type;//unsigned long long int 无符号64bit
qDebug() <<"sizeof(quint8)=" <<sizeof (unsigned_char_type)
<<"sizeof(quint16)=" <<sizeof (unsigned_short_type)
<<"sizeof(quint32)=" <<sizeof(unsigned_int_type)
<<"sizeof(quint64)=" <<sizeof (unsigned_long_long_int_type)<<endl;
qlonglong same_as_qint64_type;//相当于qint64
qulonglong same_as_quint64_type;//相当于quint64
qDebug() <<"sizeof(qlonglong)=" <<sizeof (same_as_qint64_type)
<<"sizeof(qulonglong)=" <<sizeof (same_as_quint64_type)<<endl;
uchar unsigned_char_type_same_quint8;//unsigned char 无符号8bit
ushort unsigned_short_type_same_quint16;//unsigned short 无符号16bit
uint unsigned_int_type_same_quint32;//unsigned int 无符号32bit
ulong unsigned_long_type;//unsigned long 无符号32bit
qDebug() <<"sizeof(uchar)=" <<sizeof (unsigned_char_type_same_quint8)
<<"sizeof(ushort)=" <<sizeof (unsigned_short_type_same_quint16)
<<"sizeof(uint)=" <<sizeof(unsigned_int_type_same_quint32)
<<"sizeof(ulong)=" <<sizeof (unsigned_long_type)<<endl;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
test();
test_types();
return a.exec();
}