昨天看书看兴奋了。。。

今早睡不着，六点半起床呀（平时一般七点四十五呀），

按书上测试代码呀，

考察C代码的各种变量在代码区，STACK区，HEAP区，BSS等的存放位置呀。。

XXX，像我这样的人，有木有呀，像我这样的人，有木有呀，

1 [root@localhost ccode]# cat mem_add.c 2 #include 
     
       3 #include 
      
        4 #include 
       
         5 #include 
        
          6 extern void afunc(void); 7 extern etext, edata, end; 8 int bss_var; 9 int data_var = 42;10 #define SHW_ADR(ID, I) printf("The %8s\t is at address: %8x\n", ID, &I);11 int main(void)12 {13         char *p, *b, *nb;14         printf("Adrress etex:%8x\t Adr edata %8x\t Adr end %8x\t\n", &etext, &edata, &end);15         printf("\ntext Location:\n");16         SHW_ADR("main", main);17         SHW_ADR("afunc",afunc);18         printf("\nbss Location:\n");19         SHW_ADR("bss_var", bss_var);20         printf("\ndata Location:\n");21         SHW_ADR("data_var",data_var);22         printf("\nStack Location:\n");23         afunc();24         p = (char *)alloca(32);25         if(p != NULL)26         {27                 SHW_ADR("start", p);28                 SHW_ADR("end", p + 31);29         }30         b = (char *)malloc(32 * sizeof(char));31         nb = (char *)malloc(16 * sizeof(char));32         printf("\nHeap Location:\n");33         printf("\nthe Heap start:%p\n",b);34         printf("\nthe Heap end:\%p\n",(nb = 16 * sizeof(char)));35         printf("\nb and nb in Stack\n");36         SHW_ADR("b", b);37         SHW_ADR("nb", nb);38         free(b);39         free(nb);40         return 0;41 }42 void afunc(void)43 {44         static int long level = 0;45         int stack_var;46         if(++level == 5)47         {48                 return;49         }50         printf("stack_var is at:%p\n", &stack_var);51         afunc();52 }