我的c漏洞

传入指针参数

#include<stdio.h>
#include<stdlib.h>
void READ(int *a)
{
        scanf("%d",a);
}
int main()
{
        int a;
        READ(&a);
        printf("a=%d
",a);

        int b,*c,*d;
        scanf("%d",&b);
        //*c = b; //error,c还未分配空间
        c = &b;//right, c指向b
        printf("c = %d
",*c);

        d = (int*)malloc(sizeof(int));
        *d = b;//right,已经分配空间
        printf("d = %d
",*d);

}