View Compilation Error

0_0_19426753_6702.cpp: In function 'int main(int, char**)':
0_0_19426753_6702.cpp:14:22: error: 'j' was not declared in this scope
                 for (j = 1 ; j <= i ; ++j )  
                      ^
0_0_19426753_6702.cpp:21:22: error: 'j' was not declared in this scope
                 for (j = 1; j <= i ; ++j )  
                      ^