Question

Write code to read student data from a csv file and add (prepend) that into a linked list. Assume the code is written in only one file - main.c. You are REQUIRED to write the struct definition for the linked list node. . The input file name is taken from command line argument. . You can write everything except the struct definition in the main function, or can create multiple functions up to you. Following is the sample file data. 1002 John 3.5 1003,Steve 2.5 1001, Mary, 3.0 1004,Sarah,2.7 TT T Arial 3 (12pt) TEE 25 Path: P

Answer 1

Below is the screenshot of code & output:

C:s. Command Prompt 1004, Sarah, 2.7 1001, Mary,3.0 1003, Steve, 2.5 1002, John, 3.5 C:\Users\naman\Desktop\HomeworkLib> sampledata - Notepad csv.C - Code::Blocks 16.01 File Edit View Search Project Build Debug Fortran wxSmith Tools Tools+ Plugins DoxyBlocks Settings Help Start here x bootites.cpp x csv.cx 1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<string.h> 4 /** struct definition for linked list node **/ 5 struct node { 6 int id; 7 char name [100]; 8 double gpa; 9 struct node* next; 10 - }; 11 /** function to prepend new node to beginning of linked list and return pointer to the prepended linked list **/ 12 Estruct node* prepend (struct node* linkedlist, struct node* newNode) { 13 newNode->next=linkedlist; 14 return newNode; 15 } 16 /**function to print linked list**/ 17 Pvoid print (struct node* linkedlist) { 18 struct node* temp = linkedlist; 19 while (temp) { 20 printf("%d, s, .11f\n", temp->id, temp->name, temp->gpa); 21 temp=temp->next; 22 23 -1 24 Fint main(int argc, char* argv[]) { 25 /** if file name not given in command line args, **/ 26 if(argc!=2) { 27 printf("USAGE: a <filename>\n"); 28 exit(0); 29 30 FILE* fp = fopen(argv[1], "r");/** to read from file **/ 31 if(fp) { 32 struct node* linkedlist=NULL; /**pointer to our linked list**/ 33 while (!feof(fp)) { 34 struct node* newNode = (struct node*) malloc(sizeof(struct node)); 35 /**inputting node details**/ 36 fscanf(fp,"%d,%[^,) %*",&(newNode->id), & (newNode->name), & (newNode->gpa)); 37 linkedlist=prepend (linkedlist, newNode); /**prepending node to linked list**/ 38 39 print (linkedlist); /**printing linked list for testing**/ 40 fclose(fp); 41 42 else { 43 /** if file not found **/ 44 printf("File "%s" not found!\n", argv[1]); 45 46 47 } File Edit Format View Help 1002, John, 3.5 1003, Steve, 2.5 1001 , Mary, 3.0 1004, Sarah, 2.7 } } } C:\Users\naman\Desktop\HomeworkLib\csv.c Windows (CR+LF) default

Below is the C code for the same. The linked list is also printed for testing:

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

/** struct definition for linked list node **/

struct node{

int id;

char name[100];

double gpa;

struct node* next;

};

/** function to prepend new node to beginning of linked list and return pointer to the prepended linked list **/

struct node* prepend(struct node* linkedlist,struct node* newNode){

newNode->next=linkedlist;

return newNode;

}

/**function to print linked list**/

void print(struct node* linkedlist){

struct node* temp = linkedlist;

while(temp){

printf("%d,%s,%.1lf\n",temp->id,temp->name,temp->gpa);

temp=temp->next;

}

}

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

/** if file name not given in command line args **/

if(argc!=2){

printf("USAGE: a <filename>\n");

exit(0);

}

FILE* fp = fopen(argv[1],"r");/** to read from file **/

if(fp){

struct node* linkedlist=NULL;/**pointer to our linked list**/

while(!feof(fp)){

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

/**inputting node details**/

fscanf(fp,"%d,%[^,]%*c %lf",&(newNode->id),&(newNode->name),&(newNode->gpa));

linkedlist=prepend(linkedlist,newNode);/**prepending node to linked list**/

}

print(linkedlist);/**printing linked list for testing**/

fclose(fp);

}

else{

/** if file not found **/

printf("File \"%s\" not found!\n",argv[1]);

}

}