View Compilation Error

0_0_19565416_27893.cpp: In function 'int main()':
0_0_19565416_27893.cpp:26:8: error: 'j' was not declared in this scope
   for (j = 1; j <= n; j++)
        ^
0_0_19565416_27893.cpp:33:8: error: 'j' was not declared in this scope
   for (j = n; j >= 0; j--)
        ^
0_0_19565416_27893.cpp:43:8: error: 'j' was not declared in this scope
   for (j = 1; j <= n; j++)
        ^