View Compilation Error

0_0_22151028_14737.cpp: In function 'int main()':
0_0_22151028_14737.cpp:15:5: error: 'ii' was not declared in this scope
 for(ii i=a;i<=b;i++){
     ^
0_0_22151028_14737.cpp:15:12: error: 'i' was not declared in this scope
 for(ii i=a;i<=b;i++){
            ^