I am taking some information from a user (name, address, contact number) and store it in a struct. I then store this in a file which is opened in "r+" mode. I try reading it line by line and see if the entry I am trying to enter already exists, in which case I exit. Otherwise I append this entry at the end of the file. The problem is that when I open the file in "r+" mode, it gives me Segmentation fault!
Here is the code:
struct cust{
char *frstnam;
char *lastnam;
char *cntact;
char *add;
};
Now consider this function. I am passing a struct of information in this function. Its job is to check if this struct already exists else append it to end of file.
void check(struct cust c)
{
struct cust cpy;
FILE *f;
f=fopen("Customer.txt","r+");
int num=0;
if (f!= NULL){
while (!feof(f)) {
num++;
fread(&cpy,sizeof(struct cust),1,f);
if ((cpy.frstnam==c.frstnam)&(cpy.lastnam==c.lastnam)&(cpy.cntact==c.cntact)&(cpy.add==c.add))
{
printf("Hi %s %s. Nice to meet you again. You live at %s and your contact number is %s\n", cpy.frstnam,cpy.lastnam,cpy.add,cpy.cntact);
return;
}
}
fwrite(&c,sizeof(struct cust),1,f);
fclose (f);
}
printf("number of lines read is %d\n",num);
}
