C :: Creating Linked List Of Students With Individual Data Read From A File
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...
I've been trying to read a .txt into a linked list in the attached code. I'm running into problems, specifically I'm getting errors on line 41 (curr->word=charTemp. I'm trying to set the word array equal to the charTemp array. I've tried strcpy with no luck .
Code:
#include <stdio.h>#include <stdlib.h> #include <string.h> //Struct for linked list typedef struct node { char word[25]; struct node *next; } node;
I have a program and function i'm having an issue understanding. Here is what it's doing in the main.
int main() { orderedLinkedList<MemberDO> memberList; MemberDO::readFromFile("Member.dat", memberList); return 0; }
So it is creating a linked list object using the MemberDO class type which has a int, string, char and double. Then it will call the readFromFile static function in the MemberDO. So this is where my problem is I have this function
How do I read in each individual data member from the input then create a new MemberDO object and insert the objects into the linked list specified in the second argument list?
Here is the MemberDO class declarations
class MemberDO { private: int key; string lastName; char firstInitial; double dues;
I'm trying to write a function that takes two linked lists and creates a third one with only the common elements.
It assumes the first list (the caller) has no dups, but it doesn't seem to be working. The program doesn't crash, it just hangs when it is supposed to display L3 (the third list)..everything else runs and is displayed fine.
I am doing c++ program to read coordinates from text file into double linked list. Everything seems to work perfectly but it stores only 298 items in linked list. Im not sure if my code is wrong or I missed something. On the debugger length of list is over a 1000 but like I said it print outs only 298.
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.
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.
i write this program and every things work correct except when i want to add data of file to the link list .when i add the data to the link list by add_to_linked_list() every things work correct but when i use read_linked_list_from_file() it doesn't work
I am creating linked list of memory blocks. Allocate a block of 512 bytes and insert into the first node of list. then Allocate a 2nd block of same size and add to the list. now free each block from the list.
How would I go about creating a tree like structure using linked lists, I am thinking of making a rubix cube solver program, what I want to do create nodes that each do one operation like turn left, right, up, down but I dont know how to go about starting this.
I need to create a templated doubly linked list, with an iterator class within the list class. This program is to function just like the STL list class but I only need to implement functions that I am using, My trouble is I am kind of clueless on the iterator part and the fact that the list is templated is giving me syntax grief. I have pasted the code I have done so far.
1. On the syntax implementing the list and iterator functions outside of the class 2. I am not sure when to deference the iterator in the functions, but think I have it right so far 3. For the reverse function can I copy the list into a new list in reverse then re add them to the original list overwriting the same values? I have the code I have so far there 4. For the iterator erase function, I am not sure if I am deleting the node correctly. 5. I am not sure if I need template <typename T> above the iterator functions. Does the iterator class need to be a template? Right now it is not.
// Templated doubly linked list class
#include <iostream> using namespace std; template <typename T> class list { private: Node *head; Node *tail;
Well, basically, what I've been doing was creating a class that would implement the concept of Double Linked List, but that would behave like a queue ( the STL implementation is deque, or Double Ended Queue ).
The problem occured when I have been trying to generalize the class using templates. I mean, why use only integers ? Why not double or char or what not ?
Worked perfectly before including all the template stuff..
// Source.cpp <=> Main.cpp #include <iostream> #include "DList.h" using namespace std; int main(void) { DList<int> *list; list = new DList<int>();
[Code] .....
The errors returned by the compiler:
Error1error C2955: 'Node' : use of class template requires template argument listc:usersjumperdesktopc++ otherdouble linked listdouble linked listdlist.h6 Error2error C2955: 'Node' : use of class template requires template argument listc:usersjumperdesktopc++ otherdouble linked listdouble linked listdlist.h6
I've written this class and struct to create a singly linked list. The data is stored in the binary file which I've opened and read. I'm trying to load said data into a class type array. The errors I'm getting are "incompatible types in assignment of 'StatehoodInfo' to char[3]" Lines 130-134 is what I was working on.
I dont even know where to start. I spend the last 7h infront of my computer and i'm so frustrated cause my professor gave us no information what so ever. At the moment its more of a trial and error process than anything else.
How would i set the color of an individual pixel for examplel or how would i save the file ?
I am currently working with win32 API , for image processing, one of the windows function returns RGBA ( colors ) as unsigned int , I then split it into individual bytes by creating a union ,
Code: union colour { unsigned int value; unsigned char RGBA[4]; }
to spit the int into individual bytes, my Question is there a better or my convenient way of doing this.
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.
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;
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)
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.
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
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?
