Hello,
Trying to challenge myself with C++ STL.
I want to read in data from file and do some calculation, adapted from an exercise of a book (C++ for engineers and scientist, 3rd Ed, Gary Bronson).
infile is like:

Code:

ID Name Course Credit Grade
2333021 Bokow,R. NS201 3 A
2333021 Bokow,R. MG342 3 A
2333021 Bokow,R. FA302 1 A
2574063 Failin,D. MK106 3 C
2574063 Failin,D. MA208 3 B
2574063 Failin,D. CM201 3 C
2574063 Failin,D. CP101 2 B
2663628 Kingsley,M. QA140 3 A
2663628 Kingsley,M. CM245 3 B
2663628 Kingsley,M. EQ521 3 A
2663628 Kingsley,M. MK341 3 A
2663628 Kingsley,M. CP101 3 B

My idea is to read in record as map for which ID and Name is the key, and courses as value. As the number of courses are different for each student, create two structures, one for student ID and name; the other for each course; push all the courses of the same student into a vector of structure. So the final format is like

Code:

map < struct IDnName; vector < struct Course> record> Record

My coding flow is:
1) getline of each row; parse it into tokens;
2) assign tokens into struct IDnName and struct Course;
3) push the two structs into map, struct IDnName as key and struct Course as value ;
4) push struct Course into vector if IDnName already exists;
Challenges to me:
1) Is this the right algorithm to handle the situation? If not, which is the right way?
2) For learning purpose, with my coding flow to print the record of each student, I break down the job into two functions, a) key_print() b) val_print(); but I am not sure the parameters should be passed by value or reference, which I always have problem with.
I've attached my code, for which there were too many errors to be listed here when I tried to compile. Hope someone could help me out. Thanks a lot!