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Date: Sat, 09 Jun 2012 07:28:16 -0400
From: pete <pfiland@mindspring.com>
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Xref: csiph.com comp.lang.c:22058

pete wrote:
> 
> Zhang Yuan wrote:
> >
> > ----------------------------------------------------------------------------
> > #include<stdio.h>
> > #include<stdlib.h>
> > struct stu{
> >     int num;
> >     char name[12];
> >     int age[0];
> >     struct stu *next;
> >     };
> >
> > int main(){
> >
> > struct stu *curr,*head;
> >
> > head=(stu *)malloc(sizeof(stu));
> > curr=head;
> > scanf("%d",&(head->num));
> > curr->next=NULL;
> >
> > while(curr->num!=0){
> >         scanf("%s%d",curr->name,curr->age);
> >         curr=(stu *)malloc(sizeof(struct stu));
> >         scanf("%d",&(curr->num));
> >         curr->next=NULL;
> > }
> > return 0;
> > }
> >
> > --------------------------------------------------------------------------
> > it  doesn't work.When I debug:
> >
> > input :
> > 101 zhang 19
> >
> > the memory information:4 pictures
> > http://flic.kr/p/ccMQey
> >
> > why 0x6f17e0 change from 00-->13 unexpectedly.
> > I think the "*next" and "int age"storaged in different place.
> > but it looks like it overwrite?
> 
> #include <stdio.h>
> #include <stdlib.h>
> 
> struct stu{
>     struct stu *next;
>     int num;
>     char name[12];
>     int age;
>     };
> 
> int
> main(void)
> {
>     struct stu *curr,*head;
> 
>     head = malloc(sizeof *head);
>     if (head != NULL) {
>         curr = head;
>         puts("enter number");
>         scanf("%d", &(head -> num));
>         curr -> next = NULL;
>         while(curr -> num != 0){
>             puts("enter name and age");
>             scanf("%s%d", curr -> name, &(curr -> age));
>             curr = malloc(sizeof *curr);

That doesn't make any sense!

/* BEGIN new.c */

#include <stdio.h>
#include <stdlib.h>

struct stu{
    struct stu *next;
    int num;
    char name[12];
    int age;
    };

void stu_free(struct stu *head);
void stu_print(struct stu *head);

int 
main(void)
{
    struct stu *curr,*head;
    
    puts("/* BEGIN new.c */ output\n");
    head = malloc(sizeof *head);
    if (head != NULL) {
        curr = head;
        curr -> next = NULL;
        puts("enter number");
        if (1 > scanf("%d", &(head -> num))) {
            puts("\n\nscanf problem.\n\n");
            exit(EXIT_FAILURE);
        }
        while(curr -> num != 0) {
            puts("enter name and age");
            scanf("%s%d", curr -> name, &(curr -> age));
            if (1 > scanf("%d", &(head -> num))) {
                puts("\n\nscanf problem.\n\n");
                exit(EXIT_FAILURE);
            }
            curr -> next= malloc(sizeof *(curr -> next));
            if (curr -> next == NULL) {
                break;
            }
            curr = curr -> next;
            curr -> next = NULL;
            puts("enter number");
            scanf("%d", &(curr -> num));
        }
        *(curr -> name) = '\0';
        curr -> age = 0;
    }
    stu_print(head);
    stu_free(head);
    puts("\n/* END new.c */ output");
    return 0;
}


void 
stu_free(struct stu *head)
{
    struct stu *next;

    while (head != NULL) {
        next = head -> next;
        free(head);
        head = next;
    }
}

void 
stu_print(struct stu *head)
{
    while (head != NULL) {
        printf("\nnumber == %d\n", head -> num);
        printf("name is %s\n", head -> name);
        printf("age is %d\n", head -> age);
        head = head -> next;
    }
}


/* END new.c */

-- 
pete