Storing strings to Linked list in C - arrays

Question

In my problem, I need to read lines from a txt file.
Each line contains student_id, name, birthdate, gender, department, and grade(class).
e.g ( 155898933;Nuh Kaplan;26/01/1998;M;ME;2 )
Then I need to store them in a Linked List.
I declared my structure as follows:
struct Node{
int id;
char name[100];
int date; //YYYYMMDD (String date will be converted to integer. I created dateStrInt function for this conversion.)
char gender[2];
char departmentCode[6];
int classGrade;
struct Node *next;
};
Then I read lines and store in an character array with this part of code:
if (fptr != NULL) {
while (fgets (buff, 100, fptr)) {
char* split = strtok(buff, ";");
while( split != NULL ) {
strcpy(arr[i][j], split);
j++;
split = strtok(NULL, ";");
}
i++;
j = 0;
}
}
After I stored lines into character array, I need to store them in a linked list. I tried to do it as follows:
for(int i = 0; i < len; i++) {
p = (struct Node*) malloc(sizeof(struct Node));
j = 0;
p->id = (int)arr[i][j];
strcpy(p->name, arr[i][j+1]);
p->date = dateStrInt(arr[i][j+2]);
strcpy(p->gender,arr[i][j+3]);
strcpy(p->departmentCode, arr[i][j+4]);
p->classGrade = (int)arr[i][j+5];
j = 0;
if(list == NULL){
list = p;
p -> next = NULL;
last = p;
}
else {
last -> next = p;
p -> next = NULL;
last = p;
}
}
However when I run my code, I get garbage values for student id and classGrade.
Can you help me to solve this problem?
My hole code:
#include <stdio.h>
#include<string.h>
#include <stdlib.h>
#include <ctype.h>
struct Node {
int id;
char name[100];
int date; //YYYYMMDD
char gender[2];
char departmentCode[6];
int classGrade;
struct Node *next;
};
int dateStrInt(char str[]) {
int d, m, y;
sscanf(str, "%d/%d/%d", &d, &m, &y);
return (y * 10000 + m * 100 + d);
}
int countLines(char* filename) {
int count = 0;
FILE *fptr;
fptr = fopen(filename, "r");
if(fptr == NULL){
printf("File does not exist.");
exit(1);
}
else {
for(char ch = getc(fptr); ch != EOF; ch = getc(fptr)) {
if(ch == '\n'){
count++;
}
}
}
return count + 1;
}
struct Node* createList(struct Node* list, int len, char filename[]){
struct Node* last;
struct Node* p;
char buff[100];
char arr[len][6][100];
int i = 0, j = 0;
FILE* fptr = fopen(filename,"r");
if (fptr != NULL) {
while (fgets (buff, 100, fptr)) {
char* split = strtok(buff, ";");
while( split != NULL ) {
strcpy(arr[i][j], split);
j++;
split = strtok(NULL, ";");
}
i++;
j = 0;
}
}
int o = 0;
for(int k = 0; k < len; k++){
printf("\nID = %s", arr[k][o]);
printf("\nName = %s", arr[k][o+1]);
printf("\nBirth Date = %s", arr[k][o+2]);
printf("\nGender = %s", arr[k][o+3]);
printf("\nDepartment = %s", arr[k][o+4]);
printf("\nGrade = %s", arr[k][o+5]);
o = 0;
}
for(int i = 0; i < len; i++){
p = (struct Node*) malloc(sizeof(struct Node));
j = 0;
p->id = (int)arr[i][j];
strcpy(p->name, arr[i][j+1]);
p->date = dateStrInt(arr[i][j+2]);
strcpy(p->gender,arr[i][j+3]);
strcpy(p->departmentCode, arr[i][j+4]);
p->classGrade = (int)arr[i][j+5];
j = 0;
if(list == NULL){
list = p;
p -> next = NULL;
last = p;
}
else {
last -> next = p;
p -> next = NULL;
last = p;
}
}
return list;
}
void printList(struct Node *list, int len){
struct Node *p;
p = list;
int cnt = 0;
printf("\nThe list = ");
while(p != NULL) {
if(cnt != len - 1) {
printf("\n{%d, %s, %d, %s, %s, %d} ---->",p->id, p->name, p->date,
p->gender, p->departmentCode, p->classGrade);
cnt++;
}
else
printf("\n{%d, %s, %d, %s, %s, %d} ",p->id, p->name, p->date,
p->gender, p->departmentCode, p->classGrade);
p = p->next;
}
}
int main(void) {
struct Node *head = NULL;
char filename[10];
printf("Enter file name: ");
scanf("%s", filename);
int len = countLines(filename);
struct Node* list = createList(head, len, filename);
printList(list, len);
}
test.txt file :
149875280;Burcu Aksu;04/04/1994;F;CS;3
180201201;Mustafa Kursat Yavuz Tur;12/06/1996;M;CS;3
Output:
Enter file name: test.txt
ID = 149875280
Name = Burcu Aksu
Birth Date = 04/04/1994
Gender = F
Department = CS
Grade = 3
ID = 180201201
Name = Mustafa Kursat Yavuz Tur
Birth Date = 12/06/1996
Gender = M
Department = CS
Grade = 3
The list =
{-1883589280, Burcu Aksu, 19940404, F, CS, -1883588780} ---->
{-1883588680, Mustafa Kursat Yavuz Tur, 19960612, M, CS, -1883588180}

Answer 1

Why are you declaring char array, instead you should be creating array of Node type. Just typecasting the string value to int will not convert the 2 integer fields correctly. Use the conversion function like atoi().
Change this line,
p->id = (int)arr[i][j];
to
p->id = atoi(arr[i][j]);