c++ extracting double from stream

Question

I\'ve a funny problem with school exercise. I am given latitude and longitude and I have to ensure that it is in right format: \\(\\d+\\.\\d+[NS], \\d\\+.\\d+[EW]\\)

Answer 1

You can replace E with X (for example) in the input string, after running your code you can replace back X with E in EW variable.

char    lBracket, rBracket, comma, NS, EW;
int     nLat, nLon;
double  lat, lon;

std::string inputString = "(51.5N, 0.0E)";
size_t e_pos = inputString.find( 'E' );
if ( e_pos != std::string::npos ) {
    inputString.replace( e_pos, e_pos + 1, 'X' );
}
istringstream iss ( inputString );

iss >> fixed >> lBracket >> nLat >> lat >> NS >> comma >> 
                   nLon >> lon >> EW >> rBracket;

if ( EW == 'X' ) {
    EW = 'E';
}

lat += nLat;
lon += nLon;

Update: Sorry, didn't see your remark

Only solution I came up with is replace the E with some other letter, which would probably work, but isn't really nice piece of code.

If you want - I'll delete an answer