View Compilation Error

0_0_25339778_11050.cpp: In function 'int main()':
0_0_25339778_11050.cpp:45:51: error: lvalue required as left operand of assignment
   for(int i=0,l=strlen(s1);i<l;i++)a[l-i-1].real()=(s1[i]-'0');
                                                   ^
0_0_25339778_11050.cpp:46:51: error: lvalue required as left operand of assignment
   for(int i=0,l=strlen(s2);i<l;i++)b[l-i-1].real()=(s2[i]-'0');
                                                   ^