View Compilation Error

0_0_21599658_31377.cpp:31:29: error: stray '#' in program
                 int a=s[i]-'0';
                             ^
0_0_21599658_31377.cpp:31:35: error: stray '#' in program
                 int a=s[i]-'0';
                                   ^
0_0_21599658_31377.cpp: In function 'int main()':
0_0_21599658_31377.cpp:31:30: error: lvalue required as unary '&' operand
                 int a=s[i]-'0';
                              ^