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Hello everybody. I'm making a program which saves a student record and saves them into a .txt file . At the beginning of the program it should load the contents of the txt file and load it into a linked list. (I attached the codes).. Everything else is working fine except for the part where i load the contents of the text file to a linked list. please help me :( it's taking me ages just to figure it out.
I will post your code ,because this way it's easier :)
Code:#include<stdio.h>
#include<string.h>
#include<conio.h>
#include<stdlib.h>
FILE *ftry;
void displaymenu(void);
void add(void);
void del(void);
void search(void);
void display(void);
void save(void);
typedef struct list{
char lastname[20];
char firstname[20];
char middlename[20];
char studentno[15];
char course[40];
char contact[20];
char email[30];
struct list *next;
} node;
node *head, *body, *tail;
main ()
{
system("color BC");
int choice;
node *temp3;
temp3=(node*)malloc(sizeof(node));
head=NULL;
tail=NULL;
if(((ftry=fopen("Directory.txt","r"))!=NULL))
{
while(feof(ftry)==0)
{
fgets(temp3->firstname,20,ftry);
fgets(temp3->middlename,20,ftry);
fgets(temp3->lastname,20,ftry);
fgets(temp3->studentno,15,ftry);
fgets(temp3->course,40,ftry);
fgets(temp3->contact,20,ftry);
fgets(temp3->email,30,ftry);
if(head==NULL)
{
head=temp3;
tail=temp3;
head->next=tail;
}
else
{
tail->next=temp3;
tail=temp3;
}
}
}
do
{
displaymenu();
printf("\nYour choice: ");
scanf("%d", &choice);
switch(choice)
{
case 1: system("cls"); //delete
printf("You have chosen to add a new record.\n\n");
add();
break;
case 2: system("cls");
if (head!=NULL)
{
printf("You have chosen to delete a record.\n\n");
del();
}
else
printf("There are no more records to delete!\n");
break;
case 3: system("cls");
if(head!=NULL)
{
printf("You have chosen to search the records.\n\n");
search();
}
else
printf("There are no records saved!\n");
break;
case 4: system("cls");
if (head!=NULL)
{
printf("You have chosen to display the records.\n\n");
display();
}
else
printf("There are no records to display! \n");
break;
case 5: system("cls");
printf("The record has been saved!.\n\n");
save();
break;
case 6: system("cls");
printf("\n\n\n\n\n\t\t\t Thank you for using the program!\n\n\n");
printf("\t\t\t Have a nice day!\n\n\n\n\n\n");
break;
default:
system("cls");
printf("\nWARNING: Invalid input! Choose only from 1-6. Thank you! \n");
break;
}
if (choice!=6)
{
getchar();
}
} while(choice!=6);
}
void displaymenu(void)
{
printf("\n*******************************************************************************\n");
printf("\t\t\t M E N U\n");
printf("*******************************************************************************\n");
printf("\t[1] Add new record\n");
printf("\t[2] Delete a record\n");
printf("\t[3] Search for a record\n");
printf("\t[4] Display all\n");
printf("\t[5] Save to file\n");
printf("\t[6] Exit\n");
}
void add(void)
{
int choice;
int x,y,ctr=1;
int i=0,k=0;
node *temp, *temp2,*scan;
body=(node*)malloc(sizeof(node));
temp=NULL;
int count=0;
strcpy(body->firstname,"N/A");
strcpy(body->middlename,"N/A");
strcpy(body->lastname,"N/A");
strcpy(body->studentno,"-");
strcpy(body->contact,"-");
strcpy(body->course,"-");
strcpy(body->email,"-");
printf("\nPLEASE INPUT THE STUDENT'S INFORMATION YOU WANT TO ADD: \n");
printf("\n\tFirst name: ");
getchar();
scanf("%[^\n]s",body->firstname);
printf("\n\tMiddle name: ");
getchar();
scanf("%[^\n]s", body->middlename);
printf("\n\tLast name: ");
getchar();
scanf("%[^\n]s", body->lastname);
printf("\n\tStudent number: ");
getchar();
scanf("%[^\n]s", body->studentno);
printf("\n\tCourse: ");
getchar();
scanf("%[^\n]s", body->course);
printf("\n\tE-mail address: ");
getchar();
scanf("%[^\n]s",body->email);
printf("\n\tContact number(You can use +63 and other symbol): ");
getchar();
scanf("%[^\n]s",body->contact);
if (head==NULL) //insert at beginning if without head
{
head=body;
tail=body;
tail->next=NULL;
}
else
{
while(body->lastname[i]==head->lastname[i])
{
x=strlen(body->lastname);
y=strlen(head->lastname);
if (x>y)
{
if(ctr>=y)
{
break;
}
else
{
i++;
}
}
else
if(x<=y)
{
if (ctr>=x)
{
break;
}
else
{
i++;
}
}
ctr++;
}
if (body->lastname[i]<head->lastname[i]) //insert at the beginning
{
body->next=head;
head=body;
}
else
{
if (body->lastname[i]>=tail->lastname[i]) //insert at the end
{
tail->next=body;
tail=body;
}
else
{
temp=head; //insert at the middle
while(temp!=NULL)
{
if ((body->lastname[i]>=temp->lastname[i])&&(body->lastname[i] < temp->next->lastname[i]))
{
break;
}
else
{
temp=temp->next;
}
}
body->next=temp->next;
temp->next=body;
}
}
}
do
{
printf("\n\n-> Would you like to add another record? [1 for Yes || 0 for No]: ");
scanf("%d",&choice);
switch(choice)
{
case 1:
system("cls");
add();
break;
case 0:
system("cls");
break;
default:
printf("\nThere's no such choice in the menu!\n");
break;
}if (choice!=0)
{
return;
}
}
while (choice!=0);
}
void display (void)
{
int ctr=1;
node *temp;
temp=head;
tail->next=NULL;
while (temp!=NULL)
{
printf("%d.)",ctr);
ctr++;
printf("\tNAME: \t\t%s, %s %s\n", temp->lastname,temp->firstname,temp->middlename);
printf("\tSTUDENT NO: \t%s\n", temp->studentno);
printf("\tCOURSE: \t%s\n",temp->course);
printf("\tCONTACT #: \t%s\n",temp->contact);
printf("\tE-MAIL ADDRESS: %s\n\n",temp->email);
temp=temp->next;
}
}
void del (void)
{
if (head==NULL)
{
printf("ALERT: \n\nThere are no more records to delete!\n\n");
return;
}
node *temp,*temp2,*scan;
int choice;
char num[30];
printf("\nPlease enter the STUDENT NUMBER of the student you want to delete: ");
getchar();
scanf("%[^\n]s", num);
tail->next=NULL;
temp=head;
scan=head;
while(scan!=NULL) //scan if record exists
{
if(strcmp(num,scan->studentno)==0)
{
break;
}
else
{
if(scan->next==NULL)
{
printf("\nRECORD DOES NOT EXISTS!\n\n");
free(scan);
return;
}
scan=scan->next;
}
}
if(strcmp(num,head->studentno)==0)//delete at beginning
{
//temp=head;
head=head->next;
free(temp);
}
else
{
if (strcmp(num,tail->studentno)==0)//delete at the end
{
//temp=head;
while (temp!=NULL)
{
if (temp->next==tail)
break;
else
temp=temp->next;
}
free(temp->next);
tail=temp;
tail->next=NULL;
}
else //delete at the middle
{ tail->next=NULL;
//temp=head;
while (strcmp(num,temp->next->studentno)!=0)
{
temp=temp->next;
}
temp2=temp->next;
temp->next=temp->next->next;
free(temp2);
}
}
printf("\n\nRECORD SUCCESSFULLY DELETED\n\n");
do
{
printf("\n\n-> Would you like to Delete another record? [1 for Yes || 0 for No]: ");
getchar();
scanf("%d",&choice);
switch(choice)
{
case 1:
system("cls");
del();
break;
case 0:
system("cls");
break;
default: printf("\nThere's no such choice in the menu!\n");
break;
}
}
while (choice!=0);
}
void search (void)
{
char key[40];
int choice;
int ctr=0;
node *temp;
temp=head;
tail->next=NULL;
printf("\nEnter a keyword to search (Case Sensitive). \n\nIt can be any ONE of Last name, First name, Middle name, Student number, Course,Contact or E-mail address:\n\n");
getchar();
scanf("%[^\n]s",key);
system("CLS");
while(temp!=NULL)
{
if (strcmp(key,temp->firstname)==0||strcmp(key,temp->lastname)==0||strcmp(key,temp->middlename)==0||strcmp(key,temp->course)==0||strcmp(key,temp->studentno)==0||strcmp(key,temp->contact)==0||strcmp(key,temp->email)==0)
{
printf("SEARCH RESULTS:\n");
printf("\n\tNAME: \t\t%s, %s %s\n", temp->lastname,temp->firstname,temp->middlename);
printf("\tSTUDENT NO: \t%s\n", temp->studentno);
printf("\tCOURSE: \t%s\n",temp->course);
printf("\tCONTACT #: \t%s\n",temp->contact);
printf("\tE-MAIL ADDRESS: %s\n\n",temp->email);
ctr++;
}
temp=temp->next;
}
if(ctr==0)
{
printf("SEARCH RESULTS:\n");
printf("\nNO MATCHES FOUND!\n");
}
do
{
printf("\n\n-> Would you like to search again? [1 for Yes || 0 for No]: ");
scanf("%d",&choice);
switch(choice)
{
case 1:
system("cls");
search();
break;
case 0:
system("cls");
return;
default: printf("\nThere's no such choice in the menu!\n");
break;
}
if (choice!=0)
{
return;
}
}
while (choice!=0);
}
void save(void)
{
node *temp;
temp=head;
tail->next=NULL;
if((ftry=fopen("Directory.txt","r"))!=NULL)
{
remove(ftry);
}
ftry=fopen("Directory.txt","w+");
while (temp!=NULL)
{
fprintf(ftry,"%s\n",temp->firstname);
fprintf(ftry,"%s\n",temp->middlename);
fprintf(ftry,"%s\n",temp->lastname);
fprintf(ftry,"%s\n",temp->studentno);
fprintf(ftry,"%s\n",temp->course);
fprintf(ftry,"%s\n",temp->contact);
fprintf(ftry,"%s\n\0",temp->email);
temp=temp->next;
}
fclose(ftry);
}
You could also post the .txt file and describe what is the behavior of your code :)Quote:
Originally Posted by imbaweak
Rather than posting 500+ lines of code, most of which is irrelevant to the problem, you should instead create another project just to test your ideas.
In 20 to 50 lines, you should be able to come up with a facsimile of your underlying question.Code:struct node {
int num;
struct node *next;
};
struct node *append ( struct node *head, int num ) {
// allocates a new node
// assigns num
// links the new node onto the end of the list
}
Not only is this a lot easier for us to read, it in itself may guide you to answering your own question as well (because it is clutter free).
When you understand how this works, you'll be in a better position to apply that new knowledge to your main project.
Avoid using an end-of-file test to control your loops.Code:while(feof(ftry)==0)
sorry for the late reply, here's the behavior of my code. (i'll explain the behavior of my code above) :)
My text file contains:
a
a
a
a
a
a
a
b
b
b
b
b
b
b
after i used this code to scan the txt file
and display it with this code:Code:main ()
{
system("color BC");
int choice;
node *temp3;
temp3=(node*)malloc(sizeof(node));
head=NULL;
tail=NULL;
if(((ftry=fopen("Directory.txt","r"))!=NULL))
{
while(feof(ftry)==0)
{
fgets(temp3->firstname,20,ftry);
fgets(temp3->middlename,20,ftry);
fgets(temp3->lastname,20,ftry);
fgets(temp3->studentno,15,ftry);
fgets(temp3->course,40,ftry);
fgets(temp3->contact,20,ftry);
fgets(temp3->email,30,ftry);
if(head==NULL)
{
head=temp3;
tail=temp3;
head->next=tail;
}
else
{
tail->next=temp3;
tail=temp3;
}
}
}
the only thing will be displayed isCode:voiddisplay (void){
int ctr=1;
node *temp;
temp=head;
tail->next=NULL;
while (temp!=NULL)
{
printf("%d.)",ctr);
ctr++;
printf("\tNAME: \t\t%s, %s %s\n", temp->lastname,temp->firstname,temp->middlename);
printf("\tSTUDENT NO: \t%s\n", temp->studentno);
printf("\tCOURSE: \t%s\n",temp->course);
printf("\tCONTACT #: \t%s\n",temp->contact);
printf("\tE-MAIL ADDRESS: %s\n\n",temp->email);
temp=temp->next;
}
}
b
b
b
b
b
b
b
.
The a's are not displayed.
when i try to search them using this code:
the result is "No matches found".. sme for the delete() function. it's like it is saved in a different structure. Am i missing something? how can i read from txt file and then insert it to the same linked list i used before?Code:voidsearch(void)
{
char key[40];
int choice;
int ctr = 0;
node *temp;
temp = head;
tail->next = NULL;
printf
("\nEnter a keyword to search (Case Sensitive). \n\nIt can be any ONE of Last name, First name, Middle name, Student number, Course,Contact or E-mail address:\n\n");
getchar();
scanf("%[^\n]s", key);
system("CLS");
while (temp != NULL) {
if (strcmp(key, temp->firstname) == 0
|| strcmp(key, temp->lastname) == 0
|| strcmp(key, temp->middlename) == 0
|| strcmp(key, temp->course) == 0
|| strcmp(key, temp->studentno) == 0
|| strcmp(key, temp->contact) == 0
|| strcmp(key, temp->email) == 0) {
printf("SEARCH RESULTS:\n");
printf("\n\tNAME: \t\t%s, %s %s\n", temp->lastname, temp->firstname,
temp->middlename);
printf("\tSTUDENT NO: \t%s\n", temp->studentno);
printf("\tCOURSE: \t%s\n", temp->course);
printf("\tCONTACT #: \t%s\n", temp->contact);
printf("\tE-MAIL ADDRESS: %s\n\n", temp->email);
ctr++;
}
temp = temp->next;
}
if (ctr == 0) {
printf("SEARCH RESULTS:\n");
printf("\nNO MATCHES FOUND!\n");
}
You only allocate memory for "temp3" once, thus it will always point to the same node. With every iteration you overwrite the data from the iteration before. That's why you store only the data from your last iteration.
You have to create a new node for every node inside the loop.
Bye, Andreas