Good file I/O?

[declan]

Hey guys. I have a text file in the general format of:

L_x = 5.0e-6
L_y = 1.25e-6
L_z = 1.25e-6
npart = 1000000
nstep = 10000
ncell_x = 100
x_vel_offset = 500

And more. Basically, I want to read these numbers in. How can I make it read the number after the equals sign for each line? Or is there a better way to do this? Would I have to use regex?

Thanks!

[moorecm]

Does this work?

ifstream f( "file" );
string name, delim;
double n;
while( f >> name >> delim >> n ) {
    assert( delim == "=" );
    // do something with n
}

A better way might be to use getline to read a line at a time and parse it out with a stringstream.