asked on

Abnormal program termination

extern"C" {
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
}

struct account
{
char *name;
float cur_exp,prev_debit, prev_credit;
struct account *next;
};
typedef struct account acc;
display(acc * );
acc add(acc **);
int main()
{
int i;
clrscr();
acc *list_acc;
list_acc = NULL;
clrscr();
//Print the various options available to the user
printf("1. View the records\n");
printf("2. Calcuate current per head expenditure\n");
printf("3. View total expenditure till date\n");
printf("4. Who spends the most\n");
printf("5. Graphical representation\n");
printf("6. Add/Delete a member\n");
scanf("%d", &i);
switch(i)
{
case 1: printf ("Viewing records");
       add(&list_acc);
       display(list_acc);
       break;

case 2:
case 3:
case 4:
case 5:
case 6:
default:
printf("Input data unknown\n");
};
getch();
}
display(acc *list_ptr)
{
while(list_ptr != NULL)

{
printf("\n %s" ,list_ptr->name);
list_ptr = list_ptr->next;
}
}
acc add(acc **list_ptr)
{
FILE *fp;
acc *temp, *new_blk;
temp = *list_ptr;
int i,number;
printf(" Enter the number of people in your house");
scanf("%d", &number);
fp = fopen("c:\\tcplus\\tc\\data.txt","r+");
if(fp==NULL)
printf("Error opening file\n");
for(i=1;i<=number;i++)
{
       new_blk = (acc *)malloc(sizeof(acc));
       printf("\nEnter the name of person %d", i);
       scanf("%s",new_blk->name); //This part gets written correctly when i used only the name variable
       printf("\n Enter the current expenditure of %s", new_blk->name);
       scanf("%f",&new_blk->cur_exp); // This section gives error
// says scanf : floating point formats not linked
//Abnormal program termination
       fprintf(fp,"%s %2f\n ",new_blk->name, new_blk->cur_exp);
       new_blk->next = NULL;
       if(*list_ptr == NULL)
       {
       temp = new_blk;
       *list_ptr = temp;
       }
       else
       {
       temp->next = new_blk;
       temp = temp->next;
       }

}
}

It would be highly appreciable if someone could explain the meaning of the error message.

Thanks.

imladris

I don't get such an error when running this code. However, I did note (when I ran it) that you allocate memory for newblk in:

new_blk = (acc *)malloc(sizeof(acc));
printf("\nEnter the name of person %d", i);
scanf("%s",new_blk->name); //This part gets written

but the name element of new_blk is merely: char *name.

Thus the scanf will be, at best, putting the name it reads into random memory, which could lead to all kinds of strange results past that statement.
You should allocate memory for name as well; something like:

new_blk = (acc *)malloc(sizeof(acc));
new_blk->name=(char *)malloc(30); // allocate memory to name
printf("\nEnter the name of person %d", i);
scanf("%s",new_blk->name); //This part gets written

See if that helps the error you're getting as well, or not.

ksanand_be

ASKER

I tried modifying the code as told by you. Still the same result. :-(.

ASKER CERTIFIED SOLUTION

van_dy

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van_dy

static void forcefloat(float *p)
{
float f = *p;
forcefloat(&f);
}

it says there, that just place this piece of code
in some source file, and compile it along with
your main.cpp file.

ksanand_be

ASKER

Works to the perfection! Hats-off to the person who created this experts-exchange website and a million thanks to you.

van_dy

haha right,
this is as much of a learning
process for me as it is for you.