指针的指针

#include <stdio.h>
//指针的指针

int main(){
    int i;
    int a[] = {1,2,3,4,5,6,7,8,9};
    int* pa = a;
    int* (*ppa) = &pa;
    int num = sizeof(a)/sizeof(a[0]);

    for(i = 0 ; i<num ; printf("a[%d] is %d \n",i,a[i]),i++);

    for(i = 0 ; i<num ; printf("*(a+%d) is %d \n",i,*(a+i)),i++);

    for(i = 0 ; i<num ; printf("pa[%d] is %d \n",i,pa[i]),i++);

    for(i = 0 ; i<num ; printf("*(pa+%d) is %d \n",i,*(pa+i)),i++);

    for(i = 0 ; i<num ; printf("(*ppa)[%d] is %d \n",i,(*ppa)[i]),i++);

    for(i = 0 ; i<num ; printf("*((*ppa)+%d) is %d \n",i,*((*ppa)+i)),i++);
    
    return 0;

}