c - Number of rows of a file is not known a priori -

an exercise in c tell me read infos file txt in the number of rows not known priori. example have file this:

name surname tel name1 surname2 tel2 

i tought use function fscanf() in way

file *fp  ...  while(fscanf(fp, "%s%s%s\n", name, surname, tel) != eof) {   //function } 

is right way?

h2co3 right fscanf returns number of fields matched.

the real problem don't know how many rows in file , not know how large structure or array allocate data. 1 solution use std:vector can grow.

it surprising how code reads file twice. once count lines, allocate storage , again read data. can sane solution.