View Compilation Error

0_0_33957584_29822.cpp: In function 'int main()':
0_0_33957584_29822.cpp:54:7: error: 'i' was not declared in this scope
   for(i = 0; i < len1 / 2; i++)
       ^
0_0_33957584_29822.cpp:54:18: error: 'len1' was not declared in this scope
   for(i = 0; i < len1 / 2; i++)
                  ^
0_0_33957584_29822.cpp:55:18: error: 's1' was not declared in this scope
             swap(s1[i], s1[len1 - i - 1]);
                  ^
0_0_33957584_29822.cpp:56:13: error: 'i' was not declared in this scope
         for(i = 0; i < len2 / 2; i++)
             ^
0_0_33957584_29822.cpp:56:24: error: 'len2' was not declared in this scope
         for(i = 0; i < len2 / 2; i++)
                        ^
0_0_33957584_29822.cpp:57:18: error: 's2' was not declared in this scope
             swap(s2[i], s2[len2 - i - 1]);
                  ^