The structure pointer must be initialized, and the pointer must also be initialized

#include"stdio.h"
#include"stdlib.h"
#include"string.h"
typedef struct
{
	int a;
	int b[5];
		
}Node;


int main(void)
{
	Node* node=(Node*)malloc(sizeof(Node));// Structure pointer initialization , The procedure is correct 

node->a=5;

printf("a=%d",node->a);
	
	
	
	return 0;
}

#include"stdio.h"
#include"stdlib.h"
#include"string.h"
typedef struct
{
	int a;
	int b[5];
		
}Node;


int main(void)
{
	Node* node;// Structure pointer is not initialized , Program error .

node->a=5;

printf("a=%d",node->a);
	
	
	
	return 0;
}

As long as the pointer is used , It's about initialization , Whether it is a structure pointer or a structure member variable pointer , Or pointers to other variable types , As long as the pointer is involved , It's about initialization . Because the compiler cannot automatically make the pointer point to a certain memory area when allocating memory . therefore , As long as the pointer is involved , You need to initialize it .