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\n",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\n",*c);

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

 }