Having problems writing things to a linked list. Below you can see my whole code, the bit that is causing errors is written in the main function. It is supposed to work by inputting the 5 values entered by the user into the 1st 3 nodes of the linked list. It returns the following error
cc linktest7.c -o linktest7
linktest7.c: In function ‘record_create_after’:
linktest7.c:28: error: expected expression before ‘record’
linktest7.c: In function ‘main’:
linktest7.c:63: warning: assignment from incompatible pointer type
linktest7.c:73: warning: assignment from incompatible pointer type
linktest7.c:79: error: cannot convert to a pointer type
make: *** [linktest7] Error 1
CODE
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
typedef struct student {
char ID[10];
char Name[50];
char Date[10];
float Min_temp;
float Max_temp;
} record;
typedef struct node_record {
record data;
struct node_record *next;
} NODE;
NODE *record_create(record data) {
NODE *node;
if(!(node=malloc(sizeof(NODE)))) return NULL;
node->data = data;
node->next = NULL;
return node;
}
NODE *record_create_after(NODE *node, void *data) {
NODE *newnode;
newnode = record_create(record data);
newnode->next = node->next;
node->next = newnode;
return newnode;
}
int list_foreach(NODE *node, int(*func)(void*), int(*func2)(float*)) {
while(node) {
if(func(node->data.ID)!=0) return -1;
if(func(node->data.Name)!=0) return -1;
if(func(node->data.Date)!=0) return -1;
if(func2((void*)&(node->data.Min_temp))!=0) return -1;
if(func2((void*)&(node->data.Max_temp))!=0) return -1;
node=node->next;
}
return 0;
}
int printstring(void *s) {
printf("%s \n",(char *)s);
return 0;
}
int printfloat(float *f) {
printf("%.3f \n",*f);
return 0;
}
int main() {
record *head_ptr;
NODE *record_list;
head_ptr = &record_list;
int i,a,b,c,d,e;
for(i=0;i<=3;i++){
if(head_ptr == NULL) {
printf("Enter Data : \n");
scanf("%s %s %s %f %f",&a,&b,&c,&d,&e);
record experiment = {a,b,c,d,e};
record_list = record_create(experiment);
head_ptr = &record_list;
}
else {
printf("Enter Data : \n");
scanf("%s %s %s %f %f",&a,&b,&c,&d,&e);
record experiment = {a,b,c,d,e};
record_create_after(record_list, (void*)experiment);
}
}
printf("Initial list:\n");
list_foreach(record_list, printstring, printfloat);
putchar('\n');
return 0;
}
This peice of code works when in place of the main function above
CODE
int main() {
NODE *record_list;
record experiment = {"12","bob","12/12/12",3,4};
record_list = record_create(experiment);
printf("Initial list:\n");
list_foreach(record_list, printstring, printfloat);
putchar('\n');
return 0;
}
Any help with this would be massively apreciated.
This post has been edited by jv1986: 21 May, 2008 - 12:00 PM
21 May, 2008 - 11:45 AM
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