求救：UNIX下第一次编程，报错！
Hello.cpp原文件如下：

#include <iostream.h>

int main()
{
int* iPtr;
int iCount = 18;
iPtr = &iCount;
cout < <*iPtr < <endl;
}

makefile文件内容：
Hello.exe:Hello.cpp
aCC -o Hello Hello.cpp
clean:
rm *.o
rm Hello

make 生成了Hello执行文件，chmod 755 Hello

运行却报错：
[225] % Hello
Hello: Command not found.





[解决办法]
try it to write Makefile

Hello: Hello.cpp
<TAB> aCC -o Hello Hello.cpp
clean:
<TAB> rm *.o
<TAB> rm Hello