how to detect newline in a *txt file

Dear All,
I have one txt file which contains a set of data, everyline has one data. How can I detect how many data inside?
Thank you

Likely you can read the file line by line. Lines will probably be seperated by the character '\n', write a loop to count how many of these your file has.

thank you.
I know this method, but I don't the code. Sorry, I am the new user of C/C++.

Do you know how to read a file? Look up fopen(), fclose() and fgets() if not.