#include<iostream.h>
main()
{
int a=3,b=2;
cout<<a<b<<end1;
cout<<(a<b)<<(a>b)<<(a>=b)<<(a==b)<<(a!=b)<<end1;
bool flag=2*a<b+10;
cout<<"flag="<<flag;
}

Configuration: win01 - Win32 Debug--------------------
Compiling...
win01.cpp
E:\win01\win01.cpp(5) : error C2065: 'end1' : undeclared identifier
Error executing cl.exe.

win01.obj - 1 error(s), 0 warning(s)
程序运行后,显示这,这是啥意思啊,看不懂,哪里还有问题吗?

--------------------Configuration: win01 - Win32 Debug--------------------
Compiling...
Skipping... (no relevant changes detected)
win01.cpp

win01.obj - 0 error(s), 0 warning(s)
以上是我把endl该为字母l后,点击compile(ctrl+F7)后显示的





------------------Configuration: win01 - Win32 Debug--------------------
Linking...
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/win01.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

win01.exe - 2 error(s), 0 warning(s)
这是endl后该为字母l后,单击buile(F7)后显示的

我不懂啥意思,请教他们各代表啥意思?谢谢