Programming

#include <stdio.h>
#include <string.h>
#include <stdlib.h>     // You need this for atoi

#include <map>
#include <vector>
#include <string>
using namespace std;

struct course {
    char abbrev[11];
    int credit;
    char grade;
};

int main(void)
{
        char buf[4096];
        map<int, string> names;
        map<int, vector < course > > marks;

        // Read a line into 'buf'
        while(fgets(buf, 4096, stdin) != NULL)
        {
                course grade;
                char name[21];
                int id;

                if(sscanf(buf, "%d %20s %10s %d %c",
                        &id,name,grade.abbrev,&grade.credit,&grade.grade) != 5)
                {
                        fprintf(stderr, "Bad line %s\n", buf);
                        continue;
                }

                names[id]=name;
                marks[id].push_back(grade);
        }

        for(map<int, string>::iterator i=names.begin();
                i != names.end();
                i++)
        {
                int id=(*i).first;
                printf("%d %s\n", id, (*i).second.c_str());

                for(vector<course>::iterator n=marks[id].begin();
                        n != marks[id].end();
                        n ++ )
                {
                        printf("\t%s %d %c\n",
                                (*n).abbrev, (*n).credit, (*n).grade);
                }
        }
}

names[id] = name;
marks[id].push_back(grade);

$ cat student:

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
$ ./a.out

Bad line

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

$