Edit question The following program is a C link list example. In this assignment

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The following program is a C link list example. In this assignment, you need modify this program to realize some new features.

#include <stdlib.h>

#include <stdio.h>

struct node{

int element;

struct node * next;

}; // node structure

struct node * head = NULL; // head node

void add_node(int num) {

if (head == NULL){

head = (struct node *) malloc(sizeof(struct node));

head->element = num; }

else{

struct node * p = head;

while(p->next != NULL) p = p->next;

p->next = (struct node *) malloc(sizeof(struct node));

p->next->element = num; } }

void print_list() {

struct node * p = head;

while(p != NULL){

printf("%d ", p->element);

p = p->next; } }

void free_list() {

struct node * p = head;

while(head != NULL){

p = head->next; free(head);

head = p; } }

int main(int argc, char const *argv[]) {

int n, i;

for (i = 0; i < 10; i++) {

scanf("%d", &n);

add_node(n); }

print_list();

free_list();

return 0; }

1. Create a new file named “bills_reader.c” and copy this program into this new file. The following assignments are all working on the “bills_reader.c” file.

2. At the beginning of your program, write your name into a comment. (// … or /*…*/)

3. Modify node structure, the new structure has 8 features, which are recordID, category, detail, amount, year, month, day, and next.

• recordID, year, month, and day are int numbers.

• category and detail are strings with maximum length of 255 characters.

• amount is a double numbers.

• next is a struct node pointer to next node.

4. Instead of reading from stdin, now your program should read input from a file named “bills.txt” (that is the data file in your project).

• “bills.txt” may be inexistent, empty, or containing one or multiple lines.

• if “bills.txt” is inexistent, you program should print an message “Can not find bills.txt”.

• Each line in “bills.txt” is one record, the format is “recordID%category%detail%amount%year%month%day”. ‘%’ is the separator.

• “bills.txt” file always contains an empty line at the end of this file.

• An example file can be downloaded from here ( http://grid.cs.gsu.edu/~bli6/teaching/ spring2016/bills.txt ). You can not modify this file, and your program should process this file correctly.

5. You need rewrite your print_list() function, the output format should be: RecordID: (recordID) Category: (category) Amount: $(amount) Date: (month)-(day)-(year) Detail: (detail)

6. Make sure you free all pointers before your program terminated.

Comment

Explanation / Answer

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

struct node{

int recordID, year, month, day;

char category[255], detail[255];

double amount;

struct node *next;

}; // node structure

FILE *open();

struct node * head = NULL; // head node

void add_node(int id, int year, int month, int day, char cat[],char dtls[], double amt) {

if (head == NULL){

head = (struct node *) malloc(sizeof(struct node));

head->recordID = id;

head->year=year;

head->month=month;

head->day=day;

strcpy(head->category,cat);

strcpy(head->detail,dtls);

head->amount=amt;

head->next=NULL;

}

else{

struct node * p = head;

while(p->next != NULL) p = p->next;

p->next = (struct node *) malloc(sizeof(struct node));

p->next->recordID = id;

p->next->year=year;

p->next->month=month;

p->next->day=day;

strcpy(p->next->category,cat);

strcpy(p->next->detail,dtls);

p->next->amount=amt;

p->next->next=NULL;

//p->next->element = num;

}

puts("add complite");

}

void print_list() {

struct node * p = head;

while(p != NULL){

printf("RecordID=%d ", p->recordID);

printf("Category=%s ", p->category);

printf("Amount=$%f ", p->amount);

printf("Date=%d/%d/%d ", p->month, p->day, p->year);

printf("Details=%s ", p->detail);

p = p->next;

}

}

void free_list() {

struct node * p = head;

while(head != NULL){

p = head->next; free(head);

head = p;

}

}

// HERE IS THE MAIN FUNCTION

int main(int argc, char const *argv[]) {

int n, i, count=0;

int recordID=0, year=0, month=0, day=0;

char category[255], detail[255];

double amount=0.0;

char ch, line[200];

char a[10];

FILE *ptr=open();

puts("starts");

while((ch=fgetc(ptr))!=EOF) {

if(ch!=' ') {

line[count]=ch;

count++;

puts("inside if");

}

else {

puts("inside else");

int i=0, k=0;

line[count]='';

while(line[i]!='%')

recordID=(recordID*10)+(line[i++]-'0');

i++;

while(line[i]!='%')

category[k++]=line[i++];

i++;

k=0;

while(line[i]!='%')

detail[k++]=line[i++];

i++;

k=0;

while(line[i]!='%'){

a[k++]=line[i++];

}

a[k]='';

amount=atof(a);

i++;

while(line[i]!='%')

year=(year*10)+(line[i++]-'0');

i++;

while(line[i]!='%')

month=(month*10)+(line[i++]-'0');

i++;

while(line[i]!='')

day=(day*10)+(line[i++]-'0');

i++;

count=0;

add_node(recordID, year, month, day, category, detail, amount);

}

}

/*for (i = 0; i < 10; i++) {

scanf("%d", &n);

add_node(n); }*/

print_list();

free_list();

return 0;

}

FILE *open() {

FILE *ptr;

char name[100];

puts("Enter your file name");

gets(name);

ptr = fopen(name, "rt");

if(ptr==NULL)

{

printf("Can not find bills.txt");

return NULL;

}

return ptr;

}

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