Thread: Searching a file in C

Hello there, I am trying to search a file in C using a phone number. Records are stored in this format:
1-###-###-### x###|Name|Address|false

Now the real issue. Say these two records are in the file
(564) 412-0388|Rodriguez, Rodriguez and Rodriguez|Suite 287 1609 Hayes Rue, Ernesthaven, OK 96769-8419|false
(564) 154-2439 x464|Kilback Group|041 Horace Cliff, O'Connermouth, WV 69929-2122|true


Notice they have the same code (564). The program when scanning from the file doesnt scan the entire number. It just stops when it scans (564). My code uses linked lists and hashing.

insert

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define MAX 1000




//Create a struct for the linked list
typedef struct phonebook {
    char phoneNumber[31];
    char code[50];
    char name[50];
    char address[100];
    char status[500];
    struct phonebook *next;
} Phonebook;


//declare hash table
Phonebook* hashTable[MAX];


//Function to create the linked list
void createList(){
    FILE *fp;
    char line[200];
    fp = fopen("phonebook.txt", "r");              //opens the file in read mode and scans every line
    while(fgets(line, 200, fp)){
        Phonebook *temp = (Phonebook*)malloc(sizeof(Phonebook));     //create temporary node
        sscanf(line, "%s %[^|]| %[^|]| %[^|]|", temp->phoneNumber, temp->code, temp->name, temp->address);   //scan all the information from each line
        temp->next = NULL;


        int hash_value = abs(atoi(temp->phoneNumber)) % MAX;
        if(hashTable[hash_value] == NULL) {      //if the hash value is null we store the number in temp variable
            hashTable[hash_value] = temp;
        }
        else {
            Phonebook *head = hashTable[hash_value];   //else store at head
            while (head->next != NULL) {
                head = head->next;
            }
            head->next = temp;
        }
    }
    fclose(fp);
}


//Function to search for a number
void searchNumber(char *number){
    int hash_value = abs(atoi(number)) % MAX;
    Phonebook *temp = hashTable[hash_value];
    while (temp != NULL) {
        if (strcmp(temp->phoneNumber, number) == 0) {   //compare the two if the same return 0 and print info
            printf("Number: %s\nName: %s\nAddress: %s\n", temp->phoneNumber, temp->name, temp->address);
            return;
        }
        temp = temp->next;
    }
    printf("Number not found in the phonebook\n");
}


// input function
void input(){
    char input[15];
    printf("Enter the phone number to search: ");
    scanf("%s", input);
    searchNumber(input);
}


int main(){
    createList();
    input();
    char answer[3];
}

Any help would be appreciated.

Originally Posted by john.c

The first thing I notice is that the data isn't in the format that you've specified.
Remember that %s stops as soon as it encounters a space.

Hey John. I get this but I don't understand what format operator do I replace it with?

So the format of which the program reads the file is now correct. Thank you so much. Here's how it looks:

[(564) 412-0388] [] [Rodriguez, Rodriguez and Rodriguez] [Suite 287 1609 Hayes Rue, Ernesthaven, OK 96769-8419] [false]


So I've added a record in the text file to see if the searching still works.
552-957-9835 x980|Parisian, Parisian and Parisian|Apt. 454 3645 Vance Hollow, Anaisside, DE 72068|false

So I searched the number and I got this result:
Number: 552-957-9835
Name: Parisian, Parisian and Parisian
Address: Apt. 454 3645 Vance Hollow, Anaisside, DE 72068
Code: x980


But when I search the record with the code at the front (564) it doesn't work. I'm not sure why.

I don't understand, how I understand is that the program is splitting this number in two because of the space after the area code.
(564) 412-0388