#include <stdio.h>
#include <iostream>
void swap(int **a,int **b){
int *tp=NULL;
printf("*a==%lld,*b==%lld\n", *a, *b);
tp = *a;
printf("tp==%lld\n", tp);
*a = *b;
*b = tp;
printf("*a==%lld,*b==%lld,tp==%lld,**a==%lld,**b==%lld\n", *a, *b,tp,**a,**b);
}
int main(){
int a = 1, b = 2;
printf("main_&a==%lld,main_&b==%lld\n", &a, &b);
int *p = &a;
int **pa = &p;
printf("main_pa==%lld\n", pa);
int *pp = &b;
int **pb = &pp;
printf("main_pb=%lld\n", pb);
swap(pa, pb);
printf("after_swap_a==%lld,after_swap_pb==%lld\n", *pa, *pb);
a = **pa;
b = **pb;
printf("---after_swap_a==%lld,after_swap_pb==%lld\n", **pa, **pb);
printf("%lld,%lld\n", **pa, **pb);
printf("%d,%d\n", a, b);
return 0;
}