PROGRAMMING:Secondary pointer

Analyze the following code to understand the secondary pointer.
```
#include
int main(){
int n,*p,**pp;
n=10; p=&n; pp=&p;
printf("n=%d,n=%d,n=%d\n",n,*p,**pp);
printf("%x,%x,%x\n",&n,&p,&pp);
printf("%x,%x\n",&n,p);
printf("%x,%x\n",&p,pp);
return 0;
}
Execute program, output:
n=10,n=10,n=10
28febc, 28feb8, 28feb4 (the output of this part may be different)
28febc,28febc
28feb8,28feb8
```
###Input example:
```in
```
###Output example:
```out
0
```







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