CODEWITHSUNDEEP
c++pointers
Rasmi Ranjan Nayak
Rasmi Ranjan Nayak

Reputation: 11948

Why this program is not throwing any error?

I went to an interview. Interviewer gave this question. After seeing this question, I told him that there will be an error as p is undeclared. But when I ran the program in my PC, I was amazed with the answer/output as ink that too without any error. Please help me understanding this problem.

#include <iostream>
using namespace std;
int main()
{
    static char *s[] = {"black", "white", "pink", "violet"};
    char **ptr[] = {s+3, s+2, s+1, s}, ***p;//Here
    p = ptr;
    ++p;
    cout << **p+1;
    return 0;
}

Upvotes: 2

Views: 112

Answers (2)

P0W
P0W

Reputation: 47784

How about this :-

static char *s[] = {"black", "white", "pink", "violet"};
                     ^        ^        ^       ^
                     |        |        |       |
                     |        |        |       |
                     |        |        |       |
                     +------------+    |       |
                          +---|---|----+       |
                          |   |   |            |
                     + ---|---|---|------------+
                     |    |   |   |
    char **ptr[] = {s+3, s+2, s+1,s};
                     ^    ^
    char ***p;       |    |
                     |    |
    p=ptr ;  --------+    |
                          |
    ++p; -----------------+  {'p','i','n','k'}
                                   ^
    **p+1 -------------------------+

Upvotes: 8

Yu Hao
Yu Hao

Reputation: 122373

Since you are only asking about the declaration of p:

char **ptr[] = {s+3, s+2, s+1, s}, ***p;//Here

is the same as:

char **ptr[] = {s+3, s+2, s+1, s};
char ***p;

Upvotes: 6

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