View Compilation Error

0_0_30162923_27568.cpp: In function 'int main()':
0_0_30162923_27568.cpp:135:23: error: 'i' does not name a type
         for (register i=1; i<=n; i++)
                       ^
0_0_30162923_27568.cpp:135:28: error: expected ';' before 'i'
         for (register i=1; i<=n; i++)
                            ^
0_0_30162923_27568.cpp:135:28: error: 'i' was not declared in this scope