View Compilation Error

0_0_29016844_17915.cpp: In function 'int main()':
0_0_29016844_17915.cpp:18:31: error: lvalue required as left operand of assignment
           if(a[i] = '.'||b[i] = '.'){
                               ^
0_0_29016844_17915.cpp:33:11: error: expected '}' at end of input
   return 0;
           ^
0_0_29016844_17915.cpp:33:11: error: expected '}' at end of input