参考:
[1]http://zetcode.com/gui/qt5/strings/
[2]http://blog.youkuaiyun.com/beyond_zhangna/article/details/79277378(包含示例一~示例三)
[3]http://blog.youkuaiyun.com/beyond_zhangna/article/details/79301067(包含示例四~示例六)
[4]http://blog.youkuaiyun.com/beyond_zhangna/article/details/79305183(包含示例七~示例九)
[5]http://blog.youkuaiyun.com/beyond_zhangna/article/details/79318450(包含示例十~示例十三)
需要包含的头文件:#include <QTextStream>
输出方法:QTextStream out(stdout);
示例一所用函数;
在字符串前添加字符串:pr