I get this when once I run the program listed below: ~$ gcc week5.c j ~ $ ./a.ex

Question

I get this when once I run the program listed below:

~$ gcc week5.c j

~ $ ./a.exe Enter the filename: Cans Segmentation fault (core dumped)

Please advise on what needs to be fixed. I run my programs through cygwin and save them in C.

# include <stdio.h>

#include <stdbool.h>

#include <stdlib.h>

#include<string.h>


typedef

struct INVENTORY

{

int rn;

char name[1000];

int q; float cost;

struct INVENTORY* next;

}

inv; inv* I;

int size=0;

void printinv()

{

inv* temp = I;

printf("Inventory: ");

while(temp!=NULL)

{

printf("%d %s %d %f ",temp->rn,temp->name,temp->q,temp->cost);

temp = temp->next;

}

}

bool addnew(char name[], int q, float cost)

{

inv* temp = I;

while(temp->next != NULL)

{

temp = temp->next;

}

inv* node = (inv*)malloc(sizeof(inv));

node->rn = temp->rn+1;

strcpy(node->name,name);

node->q = q;

node->cost=cost;

node->next = NULL;

temp->next = node;

size++;

return true;

}

bool updateq(int q, int rn)

{

inv* temp = I;

while(temp != NULL)

{

if(temp-> rn == rn) break;

temp = temp->next;

}

if(temp==NULL)

return false;

temp -> q = q;

return true;

}

bool updatecost(float cost, int rn)

{

inv* temp = I;

while(temp != NULL)

{

if(temp-> rn == rn) break;

temp = temp->next;

}

if(temp==NULL) return false;

temp -> cost = cost;

return true;

}

int main()

{

printf("Enter the filename: ");

char file[1000];

scanf("%s",file);

FILE* fp = fopen(file,"r");

int cn,q; char name[1000];

float cost;

inv* temp;

while(1)

{

if(fscanf(fp,"%d",&cn) == EOF) break;

fscanf(fp,"%s",name);

fscanf(fp,"%d",q);

fscanf(fp,"%f",cost);

inv* node = (inv*)malloc(sizeof(inv));

node->rn = temp->rn+1;

strcpy(node->name,name);

node->q = q; node->cost=cost;

node->next = NULL; I->next = node;

size++;

}

fclose(fp);

int choice;

while(1)

{

printf("PRESS 1 for view Inventory ");

printf("PRESS 2 to add a new Item ");

printf("PRESS 3 to update quantity of an Item ");

printf("PRESS 4 to update cost of an Item ");

printf("PRESS 0 to EXIT ");

printf("ENTER YOUR CHOICE ");

scanf("%d",&choice);

switch(choice)

{

fp = fopen(file,"w");

case 0: while(I!=NULL)

{

fprintf(fp,"%d %s %d %f ",I->rn,I->name,I->q,I->cost);

I = I->next;

}

fclose(fp);

return 1;

case 1:

printinv();

break;

case 2:

printf("Enter the name quantity and cost of this new item ");

scanf("%s",name);

scanf("%d",&q);

scanf("%f",&cost);

addnew(name,q,cost);

break; case 3:

printf("Enter the unique id and quantity of the item ");

scanf("%d%d",&cn,&q);

if(updateq(q,cn))

printf("Update Successful ");

else printf("Update Failed ");

break;

case 4:

printf("Enter the unique id and cost of the item ");

scanf("%d%f",&cn,&cost);

if(updatecost(cost,cn))

printf("Update Successful ");

else printf("Update Failed ");

break;

default:

printf("Please Enter a Valid Choice ");

}

}

return 0;

}

Explanation / Answer

segmentation fault may occur , if you are acessing memory which is out of bounds.

for example, you declared an array of char name which is of 1000 size. if u are acessing name[1001] then segmentation fault may occur.

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