C/C++ :: Reading Data From File Into Linked List
Mar 26, 2015
I have a data file that looks like:
111111111
Lisa
Porter
3
ENEE 114
CMSC 412
ENME 515
333333333
Alex
Simpson
1
CMSC 412
***
In the form student ID and then first name last name number of courses and finally the course code(s). Im currently attempting to read these into linked lists with the following code:
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct CourseInfo {
int courseID;
char courseName[30];
[Code] ......
I get no errors or warnings however when i print this out i get:
111111111
Lisa
Lisa
Porter
3
ENEE 114
CMSC 412
ENME 515
And then the program crashes. So i know that for some reason the problem is the
fgets(rootPtr->FirstName, 22, p);
But I do not know why because it seems to work for the other fgets. I also want to know why the while loop never runs and it crashes instead.
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Feb 6, 2014
I am wanting to be able to add as many different instances of data, while the user has not stated 'n', but then it only ever writes back to the screen the input for the last set of data. Where as I want to display back to the screen all the data that has been entered.
Code:
#include <iostream>
#include <string>
/*Function Declaration*/
void createItem();
void returnItem();
//Items structure
[code]...
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Mar 20, 2014
The input is in the following format
5
1 2 9.0
1 3 12.0
2 4 18.0
2 3 6.0
2 5 20.0
3 5 15.0
0
1 5
The first number is the number of vertexes in the graph. Then next lines up to 0 are the edges of the graph. With the first and second numbers being the vertexes and the third being how far the edge is between them. Trying to read in the data and store the edges into there locations in the List adjacency for that vertex. This example would make a graph with five vertexes with edges from 1 to 2&3. 2 to 4&3&1 etc. It also stores in the opposites ex 2 1 9.0.
When reading it in and printing it back out it seems that it is only storing the last data entered for that vertex. EX. When trying to print out the data read in i only get 1 3 12.0, 2 5 20.0, 3 5 15.0, ( 4 2 18.0, 5 3 15.0 would show up if `if(i<n)` was removed it is there so it does not show duplicate edges). what I am doing incorrect?
// CSCI 3300
#include <cstdio>
using namespace std;
struct ListCell
{
ListCell* next;
int vertex;
double weight;
ListCell(int v, double w, ListCell* nxt)
[Code]...
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Mar 20, 2014
Program to implement Dijkstra's Algorithm. Have Problems storing graph info into linked-list . The input is in the following format
5
1 2 9.0
1 3 12.0
2 4 18.0
2 3 6.0
2 5 20.0
3 5 15.0
0
1 5
The first number is the number of vertexes in the graph. Then next lines up to 0 are the edges of the graph. With the first and second numbers being the vertexes and the third being how far the edge is between them. Trying to read in the data and store the edges into there locations in the List adjacency for that vertex. This example would make a graph with five vertexes with edges from 1 to 2&3. 2 to 4&3&1 etc. It also stores in the opposites ex 2 1 9.0.
When reading it in and printing it back out it seems that it is only storing the last data entered for that vertex. EX. When trying to print out the data read in i only get 1 3 12.0, 2 5 20.0, 3 5 15.0, ( 4 2 18.0, 5 3 15.0 would show up if `if(i<n)` was removed it is there so it does not show duplicate edges).
#include <cstdio>
using namespace std;
struct ListCell {
ListCell* next;
int vertex;
double weight;
ListCell(int v, double w, ListCell* nxt)
[Code] ....
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Nov 19, 2013
Code:
void loadData(fstream& fin, nodePtr head){
if (fin.eof()) {
return ;
}
else
[Code] .....
This is my function and it is not working.
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Nov 17, 2013
Code:
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <iomanip>
#include "contacts.h"
using namespace std;
[Code] ....
Lines 29-32 I have a good feeling very wrong. Now I have never learned how to do this and my book covers nothing over this. I just took my final in C++ so this is not homework. I am trying to get better before Data Structures start next month.
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Oct 15, 2013
I am trying to read in a text file and add strings from it word by word into a Linked List. I'm fairly new at C and don't quite understand pointers. I've had a few different errors just messing around with it, but now I'm getting an infinite loop within my main program.
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
struct listNode { /* self-referential structure */
char data[50];
struct listNode *nextPtr;
[Code] ....
When I run my full code, it prints 12345ooooooooooooooooooooooo...etc. In my test file the first word is "Hello" so that's where the infinite 'o's come from. If the outer loop is the one that is infinite, then wouldn't the second while loop also execute more than once? What I mean is, why is the second print statement the only one that repeats itself?
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Dec 1, 2014
I have to initialize my stack (done by linked list) and I have a txt file for that. It looks like
123 Mike Smith 3.5 BA
124 John Weasly 2.9 CD
Here is what I have done so far:
However, I cannot reach any result.
Let me update:
123 Mike Smith 3.5 BA
124 John Weasly 2.9 CD
Here is what I have done so far:
struct Record{ //struct
float number;
char name[10];
char surname[10];
float GPA;
char mark[SIZE];
Record *next;
};
[Code]...
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May 5, 2013
Why program crashes when reading linked List from file?
#include <iostream>
#include <fstream>
using namespace std;
struct link{
int data;
link* next;
[Code] .....
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Mar 13, 2015
I'm having a problem in my Library assignment, this section of my code is for reading in books saved in a 'book.dat' file on my desktop and inserting them into the linked list. It kind of works, but say if there is two books in the file, it only saves the second book twice.
eg in book.dat:
123 book1 Tolkien 2009 0
111 book2 Rowling 2009 0
So once these are read in, and I call my method displayAll(), it would display the second book twice..
void importFromFile(FILE *fp) {
struct book *aBook;
struct node *aNode;
aBook = (struct book *)malloc(sizeof(struct book));
[Code] .....
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Jun 1, 2014
I've been trying to write my homework assignment (a list of countries, their codes and their capitals) and I've done most of it but I'm stuck at this: I have to open a file, read it and if there are data, add them to the list. So far I've created an element of the structure, queue list, printed the list on the screen and freed the memory. I thought that for reading the file and adding the data I could first open the file (of course) with fopen and after that use a for loop (i=0;i=!EOF;i++) to scan the whole file and fscanf(fp,"%s",result->country),etc in the loop to add the data to the structure of the element and finally insert that element to the queue list. However, when I try to do these operations, I only get to writing the name of the file and the program crashes.
Code:
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct List {
char country[20];
char code[5];
char capital[20];
struct List*next;
[Code] .....
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Sep 20, 2013
I have been attempting to store mathematical functions in a file by parsing them into a linked list with a variable sized char ** array as my storage device. I have ran into problems with the memory management detail. The program crashes before output is flushed to the console, so printf() wasn't a debugging option. Neither is my actual debugger, since it seems to get a SIGTRAP every time. I have my warnings turned all the way up, but no errors or warnings are appearing. The part I know works is the actual code that opens the file and gets a line from the file. As far as the two functions that implement the linked list, that is most likely where the problem lies. My current attempt is basically to store the size of the dynamic array in the structure and keep resizing it until there are no more tokens. Then I will store the number of elements of the array in the structure and move on to the next node.
Here is my text file I use :
Code:
sqrt( 25 ); pow( 6 ); sin( 2 );
pow( 4 ); tan( pow( 2 ) ); Main.c :
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct file_data
[Code]...
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Aug 27, 2014
In the program I'm writing, I'm creating a linked list of students with individual data read from a file. At the moment, I have written two functions to accomplish this; one that creates a student node and fills it from a line file, and a second that calls on the first to create a linked list. It seems to work fine except for one thing; It seems that EOF is being reached first, but the function continues on anyways? Here is my code so far...
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct student
// Declaring student structure globally.
[Code] .....
And here is what the input file would look like...
Thui Bhu, 100, 90, 80, 100, 89, 99, 88
Ariana B. Smith, 90, 90, 100, 100, 99, 100, 95
Emily Gonzales, 100, 90, 100, 70, 78, 78, 80
Jennifer L, 80, 90, 90, 100, 89, 99, 85
Maria Jones, 65, 72, 77, 68, 62, 70, 65
Bill Gates, 60, 54, 38, 62, 65, 60, 50
Escobar Morris, 83, 77, 88, 76, 79, 72, 76
Anne Latner, 80, 80, 85, 95, 90, 95, 98
John Doe, 45, 87, 88, 89, 67, 96, 79
And here is what the output is...
EOF
EOF in create_record
Thui Bhu: 100 90 80 100 89 99 88
Ariana B. Smith: 90 90 100 100 99 100 95
Emily Gonzales: 100 90 100 70 78 78 80
Jennifer L: 80 90 90 100 89 99 85
Maria Jones: 65 72 77 68 62 70 65
Bill Gates: 60 54 38 62 65 60 50
Escobar Morris: 83 77 88 76 79 72 76
Anne Latner: 80 80 85 95 90 95 98
John Doe: 45 87 88 89 67 96 79
Press any key to continue . . .
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Apr 12, 2014
I am getting an Unhandled exception at 0x00CB569E in AusitnHorton_Chapter17_7.exe: 0xC0000005: Access violation reading location 0xCCCCCCCC.
And, It puts a little yellow arrow at this line:
cout << nodepointer->value << " ";//print current node
when I try to run this program.
//Program:Make a ListNode and simple linked list class. Test the linked list class by adding varous numbers to the list and then test for membership. Then include a search function that returns the position of x on the list, if not found return -1.
#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>
#include <cstring>
#include <fstream>
#include <cctype>
using namespace std;
class LinkedList
[Code] ....
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May 27, 2013
I have made a Student record system in c++ using the concept of linked list. The program will take the student id, name and marks for 3 different exams. Then it will calculate the aggregate percentage based on those exams marks and display the relevant message according to the aggregate percentage. All is going well. But there is only one problem. When I modify the student record especially the marks, it doesn't change the aggregate percentage of that specific record. It shows the old one. Similarly the relevant message doesn't change too.
Code:
struct student{
int id;
char name[MAX];
string status;
double aggr;
int matric_marks, inter_marks, entryTest_marks;
[Code] .....
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Aug 6, 2014
How can I search the data? I want to get the output like this.
============================== Enter a data to search: 44 DATA FOUND! ==============================
Code:
#include <iostream>
using namespace std;
struct node {
[Code].....
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Feb 9, 2015
I am unable to insert data in a linked lists. Show function is not working.
insert
Code:
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
int data;
struct node *next;
[Code] .....
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Oct 26, 2013
I need an explanation of what linked lists are. How the nodes are been defined and used, especially in an object oriented programming. With a code example.
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Dec 24, 2013
using the following header files:
Code:
#include <list>
#include <map>
#include <iostream>
#include <algorithm>
and
Code:
std::list
If there is a creation of a list, how can one find the sizeof the list. and is it possible to copy all the data from the linked list into an array. Assuming that the data is of type
Code:
char
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Jul 6, 2013
I'm trying to run so called student-administration program.I got functions that can read and write student data, but the one saving the data from about 30 students has some problem that I can't figure. (warning: I'm quite new to C programming)so this is the code:..I guess I can't use global variables as function arguments?
Code:
//global variables
static char ReturnName[31];
static char ReturnFirstName[31];
static float ReturnAverage;
}
[code]....
incompatible types when assigning to type 'char[31]' from type 'int'
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Apr 14, 2014
I'm having a problem trying to modify my patient's data. It seems to work, but once the block of code ends it does not save to the linked list.
Problem located in case M.
linked list template header: [URL] ...
patient header: [URL] ...
patient implementation: [URL] ...
#include <iostream>
#include "listTemplate.h"
#include "PatientRecord.h"
using namespace std;
char menu() {
char input
[Code]...
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Sep 28, 2013
why strcmp() doesn't return true when comparing a string constant with a string that was acquired via a linked list. By the way, the data in the linked list was taken from a text file. Does that imply that there's a new line () character in the string from the linked list?
Code:
struct Node{
char ACNO[15];
struct Node *next;
[Code]....
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Aug 12, 2013
i am making a program that reads a file from .txt and print them out using linked list. However, i need to sort them from the highest price to lowest price.
Code:
/* my structs */
typedef struct{
Node *head;
Node *tail;
Node *iterator;
int size;
} List;
[Code]...
i know its long but im afraid that i might miss out some things.
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May 16, 2013
Error:
--------------------Configuration: nc - Win32 Debug--------------------
Compiling...
cv.cpp
Linking...
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/nc.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
nc.exe - 2 error(s), 0 warning(s)
Compiles with 0 error but on running 2 Errors appear.
I'm Inputting data of an object from user and then inserting it in the link list.
#include <iostream>
//#include <fstream>
using namespace std;
#define LEN 100
////////////////////////////////////////////////////////////////////////////////////////////////////
class employee{
[Code] ....
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Mar 30, 2014
The program use a circular linked list and data structures to store the tasks.
- Every task should include a task name, a name for the person assigned to it, and the deadline for the task.
- Variables should be dynamic and their sizes should be determined at runtime based on the length of user input.
- You should implement the following functions (with appropriate arguments and return types) for your structure: add(), remove(), search(), and list().
- The add()function should add tasks alphabetically by task name. You do not need to implement any file operations.
- The search() function should be able search for a task by the task assignee name or the task name.
- The list() function should print records to the screen in the order they appear in the circular linked list.
- You should successfully deallocate all of the allocated memory before termination of your program.
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Jun 20, 2013
I have to write a program that reads from a text file, which contains a list of stock hourly prices and the company names. Something like this:
78.52 82.56 75.10 71.97 Water Company
22.40 25.68 21.37 22.96 Mega Shipping Inc
Each company data will be kept in a structure that contains: a pointer for the name, an array of the prices, and the average price for the day. The structures will be kept in a linked list. Each node structure will contain a pointer to one company data, and a pointer to the next node structure.This is all I have so far..
Code:
typedef struct {
char *companyName;
double hourlyPrices[NUM_PRICES];
double avgPrice;
} COMPANYDATA;
}
[code]...
We have to sort the nodes alphabetically. My question is, how do I read the data from the file one line at a time, and insert them alphabetically one by one?
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