字符数组与字符指针的联系与区别

　dyli现在来看看字符数组与字符指针的联系与区别

 

1、请先看下面的代码

 

/* Name ： char_array.c
 * Author ： dyli
 * Write Date ： 20110807
 * Description ： Used to distinguish between an array of
                    characters and the string pointer.
 * */

#include <stdio.h>

int main(int argc, char *argv[])
{

    char dyli_array[15] = "isDyliArray";/* Define an array of characters,
                                          pay attention to the format.*/

    char* dyli_str_pointer = "isDyliStrPointer";/* Define a string pointer*/

    /*Below you can see,the base Address of the character array can be obtained
     in three:
     1,&+an array name;
     2,&+ the first element of array.
     3,the array name.    */

        /* Use "&" to get the address of dyli_array */
    printf("&dyli_array is %x\n",&dyli_array);
        /* Get firset Item address of dyli_array */
    printf("&dyli_array[0] is %x\n",&dyli_array[0]);
        /* Here,dyli_array is a array pointer,
        it representative the address of dyli_array.*/
    printf("dyli_array is %x\n",dyli_array);

    /* Yes!You know an array of characters can be output like this. */
    printf("the array of dyli_array is = %s\n",dyli_array);
    printf("output the first element of dyli_array = %c\n",dyli_array[0]);

    printf("/*****----------------------------------------------------------****/");

    /*Below you can see,the string pointer Variable itselt has an Address.
    */
        /* the pointer Variable Address*/
    printf("\n&dyli_str_pointer is %x\n",&dyli_str_pointer);
        /* the string constant first element address.*/
    printf("&dyli_str_pointer[0] is %x\n",&dyli_str_pointer[0]);
        /* the BaseAddress of string constant*/
    printf("dyli_str_pointer is %x\n",dyli_str_pointer);

    printf("the string of dyli_str_pointer is = %s\n",dyli_str_pointer);
    printf("output the first element of dyli_str_pointer point to \n\
         string constant = %c\n",dyli_str_pointer[0]);
    getchar();
    return 0;
}

 

2、运行结果

 

[root@localhost char_array]# ./char_array
&dyli_array is bfe04d95
&dyli_array[0] is bfe04d95
dyli_array is bfe04d95
the array of dyli_array is = isDyliArray
output the first element of dyli_array = i
/*****----------------------------------------------------------****/
&dyli_str_pointer is bfe04d90
&dyli_str_pointer[0] is 80485e4
dyli_str_pointer is 80485e4
the string of dyli_str_pointer is = isDyliStrPointer
output the first element of dyli_str_pointer point to
      string constant = i

 

3、再看看这两者在内存里面的怎样分布的

 

（1）、char dyli_array[15] = "isDaliArray";

 

 

 

 

 

（2）、char* dyli_str_pointer = "isDyliStrPointer";

 

 

 

 

　　dyli_str_pointer这是一个字符指针变量，变量就会有空间，也会有地址。

　　这个指针变量地址可以用&dyli_str_pointer来取；它的空间里面存放的是字符串常量的地址，因为该常量的地址已经赋值dyli_str_pointer变量，故可以直接用dyli_str_pointer来取得。

 

　　而这个dyli_str_pointer所指向的字符串常量的元素，也可以用dyli_str_pointer[0]，dyli_str_pointer[1].....dyli_str_pointer[*]号取得！！