指標陣列

1. 指標變數跟其他型態的變數一樣，可以宣告成「指標陣列」。

   int *ptr[MAX];
   

2. 範例一：整數指標

   [dywang@deyu zzz]$ vim pointer5.c
   [dywang@deyu zzz]$ cat pointer5.c
   #include <stdio.h>
   
   main () {
   	int var[]={11, 22, 33, 44};
   	int MAX=sizeof(var)/sizeof(int);
   	int i, *ptr[MAX];
   
   	for ( i=0; i<MAX; i++) {
   		ptr[i] = &var[i];
   		printf( "*ptr[%d]=%d\t\tptr[%d]=%x\n", i, *ptr[i], i, ptr[i]);
   	}
   }
   

3. 編譯

   [dywang@deyu zzz]$ gcc -o pointer5 pointer5.c
   

4. 執行結果

   [dywang@deyu zzz]$ ./pointer5
   *ptr[0]=11		ptr[0]=8d1ef780
   *ptr[1]=22		ptr[1]=8d1ef784
   *ptr[2]=33		ptr[2]=8d1ef788
   *ptr[3]=44		ptr[3]=8d1ef78c
   

5. 範例二：字元指標

   [dywang@deyu zzz]$ vim pointer6.c
   [dywang@deyu zzz]$ cat pointer6.c
   #include <stdio.h>
   
   main () {
   	char *name[]={ "dywang", "linda", "peter", "rita" };
   	int MAX=sizeof(name)/sizeof(*name);
   	int i;
   
   	for ( i=0; i<MAX; i++)
   		printf( "name[%d]=%s\n", i, name[i]);
   }
   

6. 編譯

   [dywang@deyu zzz]$ gcc -o pointer6 pointer6.c
   

7. 執行結果

   [dywang@deyu zzz]$ ./pointer6
   name[0]=dywang
   name[1]=linda
   name[2]=peter
   name[3]=rita