Inserting a name and number to the end of linked l

Question

My text file reads like this:

George Washington, 2345678 
John Adams, 3456789 
Thomas Jefferson, 4567890 
James Madison, 0987654 
James Monroe, 9876543 
John Quincy Adams, 8765432 
Andrew Jackson, 7654321 
Martin Van Buren, 6543210

Can someone offer insight on how I get my insert function to add the name and ID number to the end of the linked list? When I run the code an select option 1 it skips over the add name and only asks to enter the integer. After that nothing happens.

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

//Creates node for holding student's information
struct node
{
    char name [50];
    int id;
    struct node *next;
}*head;

//Create Function Prototypes
void readDataFile ();
void insert(char *inName, char *inID);
void display(struct node *d);
int deleteID(int num);
void deleteName(char dname);


//Main function
int main()
{
    //Declare variables
    int i, num, id;
    char *name;
    char nameDelete [50];
    char nameInsert [50];
    struct node *n;

    //initialize link list
    head = NULL;

    //Read in file
    readDataFile();

    //Create list of operations utilized in program
    while (1)
    {
        printf("\nList Operations\n");
        printf("===============\n");
        printf("1.Insert\n");
        printf("2.Display\n");
        printf("3.Delete by ID\n");
        printf("4.Delete by Name\n");
        printf("5.Exit\n");
        printf("Enter your choice : ");

        if(scanf("%d", &i) <= 0)
        {
            printf("Enter only an Integer\n");
            exit(0);
        }
        else
        {
            switch(i)
            {
                case 1:
                    printf("Enter the name to insert:\n");
                    scanf("%[^\n]s", nameInsert);
                    getchar();
                    printf("Enter the ID associated with the name: ");
                    scanf("%d", &id);
                    insert(nameInsert, id);
                    break;
                case 2:
                    if (head == NULL)
                        printf("List is Empty\n");
                    else
                    {
                        printf("Elements in the list are:\n");
                    }
                    display(n);
                    break;
                case 3:
                    if(head == NULL)
                        printf("List is Empty\n");
                    else
                    {
                        printf("Enter the ID number to delete: ");
                        scanf("%d", &id);
                    }

                    if(deleteID(id))
                        printf("%d deleted successfully \n", id);
                    else
                        printf("%d not found in the list\n", id);
                    break;
                case 4:
                    if(head == NULL)
                        printf("List is Empty\n");
                    else
                    {
                        printf("Enter name to delete: ");
                        gets(nameDelete);
                    }
                case 5:
                    return 0;
                default:
                    printf("Invalid option\n");
            }
        }
    }
    return 0;
}

//Define the functions
//Function to read in the data file
void readDataFile()
{
    //Initialize the link the list
    struct node *temp;
    temp = malloc(sizeof(struct node));
    temp->next = NULL;
    head = temp;

    //Open up the file
    FILE *fp;
    fp = fopen("AssignmentOneInput.txt", "r");

    //Use memset function to copy the characters in string
    char string[100];
    memset(string, 0, 100);

    //Create while loop scan in the contents of the file
    while(fgets(string, 100, fp) != NULL)
        {
        sscanf(string, "%20[^,], %d", temp->name, &temp->id);
        temp->next = malloc(sizeof(struct node));
        temp = temp->next;
        temp->next = NULL;

        }
        fclose(fp);
}

//Function to insert a name and ID number
void insert(char *inName, char *inID)
{
    //Create temporary and helper nodes
    struct node *temp, *helper;

    //Allocate the memory for the temporary node
    temp = (struct node *)malloc(sizeof(struct node));

    //Convert character into integer value
    int intID = atoi(inID);

    //Set the data in the node
    strcpy(temp->name, inName);
    temp->id = intID;
    temp->next = NULL;

    //Create new node and add to it
    helper = (struct node *)head;

    while(helper->next != NULL)
    {
        helper = helper->next;
    }

    helper->next = temp;
    helper = temp;
    helper->next = NULL;
}

Answer 1

Once you enter 1 in selection option the standard input has both 1 and newline character, which you are expecting immediately in the next scanf statement.

change the scanf("%[^\n]s", nameInsert); into scanf("%s", nameInsert); or use getchar() immediately after getting selection option.