View Compilation Error

0_0_19436517_10944.cpp: In function 'int main()':
0_0_19436517_10944.cpp:23:17: error: 'i' was not declared in this scope
             for(i=0; i<N; i++)  
                 ^
0_0_19436517_10944.cpp:26:17: error: 'i' was not declared in this scope
             for(i=N-1; i>0; i--)  
                 ^
0_0_19436517_10944.cpp:29:17: error: 'i' was not declared in this scope
             for(i=0; i<N; i++)  
                 ^