How can I read the next line from a text file every time I enter the loop?

Question

I have written this program and I want every time I enter the while loop to read the next line from my text file and not the before lines. So far, this code with fscanf inserts in a list all the elements before the one I want. My text files have 4 elements per line and I do not want to read it all as a string also. For example, if the elements from line 1 have entered in the list, the next time in the loop I want to start from line 2 and not to read again the line 1 etc.

for(Time=0.0;Time<200;Time=Time+12.0) {
        for(i=5;i<8;i++){
        char to_open[32];
        snprintf(to_open,32, "fptg_%d.txt", i);
        printf("i=%d\n", i);
        if ((fr = fopen(to_open, "r")) == NULL)
        {
            break;
        }else{
            fscanf(fr, "%d %d %d %lf",&rollnumber, &src, &dest, &gentime);
            while(gentime<Time){
                if (insertedpackets[i]<10){ 
                    printf ("-------------TIMESLOT-------------\n");
                    printf("time: %.1f\n",Time);
                    fscanf(fr, "%d %d %d %lf\n",&rollnumber, &src, &dest, &gentime);
                    insert(rollnumber,src,dest,gentime); 
                    insertedpackets[i]++;
                    printf("insertedpackets[%d]:%d\n\n", i, insertedpackets[i]); 
                    printf ("----------list till now-----------\n");
                    display();
                    printf ("----------------------------------\n\n\n\n");
        }
        else if (insertedpackets[i]>=10)
        { 
            break;
        }
    
    }