View Compilation Error

799246_0_0_15250.cpp: In function `int main()':
799246_0_0_15250.cpp:7: error: conflicting declaration 'double a'
799246_0_0_15250.cpp:6: error: 'a' has a previous declaration as `std::string a'
799246_0_0_15250.cpp:7: error: declaration of `double a'
799246_0_0_15250.cpp:6: error: conflicts with previous declaration `std::string a'
799246_0_0_15250.cpp:9: error: no match for 'operator*' in 'a * b'