#include <fstream>
#include <iostream>
using namespace std;

int main()
{
        std::ifstream ifs( "test_mix.txt" );
        char line[255];
        double a1,a2,a3;

        cout<<"read mix"<<endl;

        while(ifs>>a1>>line>>a2>>a3) {
           cout<<a1<<" "<<line<<" "<<a2<<" "<<a3<<endl;
        }
        return 0;
}
---------------------
test_mix.txt‚Ì’†‚Í
1 HPK 5 6
1 HPK 5  7
1 HPK  6 7
1 HPK 5  7
1 CIS 5  667
======================================
$ g++ ifsteram_mix.cxx
$ ./a.exe
read mix
1 HPK 5 6
1 HPK 5 7
1 HPK 6 7
1 HPK 5 7
1 CIS 5 667