View Compilation Error

0_0_13729812_24883.cpp: In function 'int main()':
0_0_13729812_24883.cpp:5:12: error: 'N' was not declared in this scope
 while(cin>>N,N)
            ^
0_0_13729812_24883.cpp:6:6: error: 'i' was not declared in this scope
 {for(i=1;i<=N;i++)
      ^
0_0_13729812_24883.cpp:13:5: error: 'i' was not declared in this scope
 for(i=1;i<=N;i++)
     ^