blabla

#include <stdio.h>
#include <stdlib.h>

typedef struct STUDENT {
    int id;
    char name[30];
    struct STUDENT* next;
    struct STUDENT* prev;
} S;

int main() {
    char name[30];
    int num, i;
    FILE* input = fopen("blabla.txt","r");
    S* first = (S*)malloc(sizeof(S));
    first->prev=NULL;
    S* current = first;
    S* temp;

while(fscanf(input,"%d %s",&current->id,current->name)==2)
    {
        current->next = (S*)malloc(sizeof(S));
        temp = current;
        current = current->next;
        current->prev = temp;
    }
current->id = -1; //last one

for(current=first; current->id!=-1; current=current->next)
    printf("%d %s\n",current->id,current->name);

//  printf("%d %s\n",first->id,first->name);
    return 0;
}