View Compilation Error

0_0_27244160_16566.cpp: In function 'int main()':
0_0_27244160_16566.cpp:55:3: error: expected primary-expression before 'for'
   for(i = len - 1; i >= 0; i --)
   ^
0_0_27244160_16566.cpp:55:32: error: expected ';' before ')' token
   for(i = len - 1; i >= 0; i --)
                                ^