雙重指標

 #include <stdio.h>

#include <stdlib.h>

unsigned int x = 10;

unsigned int *ptr = &x;

unsigned int **pptr = &ptr;

const char *p[4] = {"PIC16", "PIC18", "PIC24", "DSPIC"};

const char **pp = &p[0]; // const char **pp = p;

void string_access(const char **str_ptr)

{

    unsigned char i = 0;

    unsigned char ch;

    do

    {

        ch = *(*str_ptr+i);

        printf("%c",ch);

        i++;

    }

    while(ch != '\0');

    printf("\n");

}

int main(void)

{

    printf("x value = %d\n", x);

    printf("x address = %p\n", &x);

    printf("ptr address = %p\n", &ptr);

    printf("ptr point to = %p\n", ptr);

    printf("ptr point value = %d\n", *ptr);

    printf("pptr address = %p\n", &pptr);

    printf("pptr point to %p\n", pptr);

    printf("*pptr point to %p\n", *pptr);

    printf("pptr point value = %d\n", **pptr);

    printf("---------------------------\n");

    string_access(&*pp);

    pp++;

    string_access(&*pp);

    pp++;

    string_access(&*pp);

    pp++;

    string_access(&*pp);

    system("pause");

    return 0;

}