View Compilation Error

0_0_25339825_12726.cpp: In function 'int main()':
0_0_25339825_12726.cpp:45:57: error: lvalue required as left operand of assignment
   for(int i=0,len=strlen(s1);i<len;i++)a[len-i-1].real()=(s1[i]-'0');
                                                         ^
0_0_25339825_12726.cpp:46:57: error: lvalue required as left operand of assignment
   for(int i=0,len=strlen(s2);i<len;i++)b[len-i-1].real()=(s2[i]-'0');
                                                         ^