作业帮if else 用法if(m_Rgn==NULL){\x05 m_Rgn=new CRgn; }else m_Rgn->DeleteObject();////////////请问这里怎么理解?{CPoint point[4];CPoint FirstPoint;CPoint SecondPoint;...}
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/05 01:01:20
![if else 用法if(m_Rgn==NULL){\x05 m_Rgn=new CRgn; }else m_Rgn->DeleteObject();////////////请问这里怎么理解?{CPoint point[4];CPoint FirstPoint;CPoint SecondPoint;...}](/uploads/image/z/955269-45-9.jpg?t=if+else+%E7%94%A8%E6%B3%95if%28m_Rgn%3D%3DNULL%29%7B%5Cx05+m_Rgn%3Dnew+CRgn%3B+%7Delse+m_Rgn-%3EDeleteObject%28%29%3B%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%E8%AF%B7%E9%97%AE%E8%BF%99%E9%87%8C%E6%80%8E%E4%B9%88%E7%90%86%E8%A7%A3%3F%7BCPoint+point%5B4%5D%3BCPoint+FirstPoint%3BCPoint+SecondPoint%3B...%7D)
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if else 用法if(m_Rgn==NULL){\x05 m_Rgn=new CRgn; }else m_Rgn->DeleteObject();////////////请问这里怎么理解?{CPoint point[4];CPoint FirstPoint;CPoint SecondPoint;...}
if else 用法
if(m_Rgn==NULL)
{
\x05 m_Rgn=new CRgn;
}
else m_Rgn->DeleteObject();////////////请问这里怎么理解?
{
CPoint point[4];
CPoint FirstPoint;
CPoint SecondPoint;
.
.
.
}
if else 用法if(m_Rgn==NULL){\x05 m_Rgn=new CRgn; }else m_Rgn->DeleteObject();////////////请问这里怎么理解?{CPoint point[4];CPoint FirstPoint;CPoint SecondPoint;...}
m_Rgn->DeleteObject 根据它的返回值来决定是否执行吧.