View Compilation Error

0_0_33957590_24910.cpp: In function 'int main()':
0_0_33957590_24910.cpp:54:7: error: 'i' was not declared in this scope
   for(i = 0; i < strlen(t) / 2; i++)
       ^
0_0_33957590_24910.cpp:55:26: error: 'len1' was not declared in this scope
             swap(t[i], t[len1 - i - 1]);
                          ^
0_0_33957590_24910.cpp:56:13: error: 'i' was not declared in this scope
         for(i = 0; i < strlen(s) / 2; i++)
             ^
0_0_33957590_24910.cpp:57:26: error: 'len2' was not declared in this scope
             swap(s[i], s[len2 - i - 1]);
                          ^