How can I read one line at a time with C shell in unix

I try to make a small script, using c shell, that will take a file made of several lines, each containing a name and a number and sum all numbers that a have certain name. How can I put into a variable the next line each time?

the summig part I do by: (after I'll be able to get a full line to $line)

set line =($line)
@ sum = $sum + $line[2]