Create new node in linked list with data type "struct" for data

Question

typedef struct class
{
   ...
}Class;

typedef struct node
{
    Class data;
    struct node *next;
}Node;

Node* newNode()
{
    Node* temp = (Node*)malloc(sizeof(Node));
    temp -> data = malloc(sizeof(Class));
    temp -> next = NULL;
    return temp;
}

The compiler says there is a problem with the line: temp -> data = malloc(sizeof(Class));, specifically "incompatible types in assignment".

What am I doing wrong?

Michael Bianconi · Accepted Answer · 2019-08-07 21:21:46Z

1

You're saying that data is a Class but you're trying to assign it a Class*.

answered Aug 7, 2019 at 21:21

Michael Bianconi

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7 Comments

sdfrn42 Over a year ago

Okay, I see the problem, so how would I fix it?

Michael Bianconi Over a year ago

In the struct definition, change Class data; to Class* data;

John Bollinger Over a year ago

@sdfrn42, better still might be to just do nothing. Your struct node has a Class as a member, so the space allocated for a node already includes space for a Class. You don't need to allocate that separately. Change the member to a Class * only if that's what you actually want to have.

sdfrn42 Over a year ago

Will do in a couple mins when it lets me.

sdfrn42 Over a year ago

@JohnBollinger I didn't actually think of that... What exactly changes when i change it to Class *?

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