关于指针

malloc与不使用malloc

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3
 4
 5 typedef struct {
 6     int a;
 7     char * ch;
 8     int aa;
 9 }node;
10
11 int main()
12 {
13     int *i = NULL;
14     int ii = 10;
15     i = &ii;
16     printf("local %p\n", i);
17     node * aa = (node*)malloc(sizeof(node));
18     printf("local %p\n", aa->ch);
19     if(aa->ch ==NULL){
20         printf("local %p\n", aa->ch);
21     }
22
23     node bb;
24     printf("local %p\n", bb.ch);
25     free(aa);
26     return 0;
27 }

root@u18:~/cp/test# ./a.out
local 0x7fffe2aa515c
local (nil)
local (nil)
local 0x400640