在C中初始化结构会导致“声明匿名结构必须是定义”错误

Question

I declare a structure in my C code known as an edge

struct edge{
int weight;
struct node *Node1;
struct node *Node2;
};

where node is another structure that is defined in my code as well. When I attempt to declare an edge in my code I use

struct edge *ab=(struct edge*)malloc(sizeof(struct(edge));

This gives me two errors: 1)declaration of anonymous struct must be a definition 2)type name requires a specifier or qualifier.

What am I doing incorrectly? For further reference my node structure is defined as

struct node{
char data;
struct node *parent;
} ;

Answer 1

sizeof(struct(edge))

must be

sizeof(struct edge)

Adding () to a structure tag is not allowed.

Answer 2

Update this statement

struct edge *ab=(struct edge*)malloc(sizeof(struct(edge));

the following way

struct edge *ab = ( struct edge* )malloc( sizeof(struct edge ) );

You have a redundant open parenthesis in the original statement.