C++ help

Something I need help with is importing data. I can't really grasp how to do it very well.
The assignment I have to do is

 Spoiler

[SIZE=3]For research purposes and to better help students, the admissions office of your local college wants to know how well female and male students perform in certain courses. You receive a file that contains female and male student GPAs for certain courses. The letter code f is used for female students and m for male students. Every file entry consists of a letter code followed by a GPA. Each line has one entry. The number of entries in the file is unknown. Write a program that computes and outputs the average GPA for both female and male students. Format your results to two decimal places.

Sample output:
Processing grades.
f 3.40
f 4.00
m 3.56
m 3.80
f 2.30
f 3.95
m 3.90
m 4.00
m 2.00
f 4.00
f 2.80
m 3.70
m 2.98
f 3.89
m 4.00
f 3.90
m 1.90
m 2.90
f 1.50
f 2.67
m 3.80
m 2.35
f 2.90
f 3.70
f 4.00
m 3.78
m 4.00
f 3.98
Sum female GPA = 46.99
Sum male GPA = 46.67
Female count = 14
Male count = 14
Average female GPA = 3.36
Average male GPA = 3.33
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He gave us a notepad file called Ex11Data.txt that has all of that info in it. Now I could do the assignment without importing the data (by just entering it all manually into the program itself), but I won't learn anything by doing it that way. If anyone could explain the best way to import the data that would be great.

Another thing I have trouble understanding is how to make use of object oriented programming. I guess I just need to practice more with it. The last time I had a class on it was a few months ago and I kind of forgot it =P. I know an object is something that is kind of universal to the program and can be moved around, but I'm having a bit of trouble creating one properly and making good use of it/knowing when to use it.