A problem in using g++

[nudthutao]

help!help! 
I am here waiting for your great help. Thanks in advance. 
A simple program as the following: 

//try.cpp 
int main() 
{ 
for(int i=0,j=0;i<10;i++) 
j=j+i; 
return j; 
} 

To compile it, use the command "g++ try.cpp" 
and you will get the message like "lookup j.......obsolete variable j". No 
executable file a.out appeared. 
Why? How should I compile it and get the executable file without changing the 
program itself? 
You help will be a great favor to me. If you will, you can write to 
"nudthutao@sina.com" 
Also, I compiled the program both under the Redhat Linux 7.0 and Bluepoint 
Linux 2.0, which is also base on the former, and only successed in case of 
Bluepoint Linux 2.0. 
How does this happen? 


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