Easy way to remove extension from a filename?

Question

I am trying to grab the raw filename without the extension from the filename passed in arguments:

int main ( int argc, char *argv[] ) {     // Check to make sure there is a single argument     if ( argc != 2 )     {         cout<<"usage: "<< argv[0] <<" <filename>\n";         return 1;     }      // Remove the extension if it was supplied from argv[1] -- pseudocode     char* filename = removeExtension(argv[1]);      cout << filename;  } 

The filename should for example be "test" when I passed in "test.dat".

Answer 1

size_t lastindex = fullname.find_last_of(".");  string rawname = fullname.substr(0, lastindex);  

Beware of the case when there is no "." and it returns npos

Answer 2

This works:

std::string remove_extension(const std::string& filename) {     size_t lastdot = filename.find_last_of(".");     if (lastdot == std::string::npos) return filename;     return filename.substr(0, lastdot);  }