C Programming - Pointers - Discussion
Discussion Forum : Pointers - Find Output of Program (Q.No. 1)
1.
What will be the output of the program ?
#include<stdio.h>
int main()
{
static char *s[] = {"black", "white", "pink", "violet"};
char **ptr[] = {s+3, s+2, s+1, s}, ***p;
p = ptr;
++p;
printf("%s", **p+1);
return 0;
}
Discussion:
110 comments Page 4 of 11.
Emanuel said:
9 years ago
I think the name of the array is a pointer to the 1st method of the array, but when it is stated implicitly how it can be catched by a pointer to char?
Emanuel said:
9 years ago
I think it doesn't work.
The 1st line keeps the array of char pointers. The array of addresses of the first team of each char array, and who will keep the each char array itself?
Correct me, if I am wrong.
The 1st line keeps the array of char pointers. The array of addresses of the first team of each char array, and who will keep the each char array itself?
Correct me, if I am wrong.
Xyz said:
9 years ago
What is the output if we put %c instead of %s in printf statement?
LOÃS said:
9 years ago
When one write char ***p; p is adress of an array of char;
i.e:
char *s[]={"white", "pink", "violet", "black"}; // s is an array of char who is equal to char **s.
If you want a pointer to point on that array you will declare it as char ***ptr=&s and then:
ptr--->&s;--->@@white
*ptr---->s;--->@white
**ptr---->*s--->white
**ptr+1--->*s+1--->hite
Now look at Akshay Kalra concept, it's very clear.
i.e:
char *s[]={"white", "pink", "violet", "black"}; // s is an array of char who is equal to char **s.
If you want a pointer to point on that array you will declare it as char ***ptr=&s and then:
ptr--->&s;--->@@white
*ptr---->s;--->@white
**ptr---->*s--->white
**ptr+1--->*s+1--->hite
Now look at Akshay Kalra concept, it's very clear.
Priya said:
9 years ago
I don't understanding the concept of ***p. Please explain me.
Ramya said:
9 years ago
Are we not supposed to use *** to access "pink" by p?
Isn't it should be ***p+1?
Isn't it should be ***p+1?
Uma said:
9 years ago
I am not understanding where we use the ***p anyone help me.
Shreyas said:
9 years ago
Thanks @Adeel. It seemed simple and easy :).
Jagruti said:
9 years ago
**p+1 why that is used why **?
Akshay Kalra said:
9 years ago
@Situ Answer would remain same.
Now in your case:-
static char *s[] = {"white", "pink", "violet", "black"};
It means --> s[0] = "white" s[1] = "pink" s[2] = "violet" s[3] = "black"
char **ptr[] = {s, s+1, s+2, s+3}, ***p;
It means --> ptr[0] = s ptr[1] = s+1 ptr[2] = s+2 ptr[3] = s+3
And, p = ptr --> &s
Now ++p;
That means p = p+1 --> ptr+1 --> &(s+1)
Now *p ---> s+1
**p ---> *(s+1) --> s[1] --> "pink"
**p+1 --> "ink".
Now in your case:-
static char *s[] = {"white", "pink", "violet", "black"};
It means --> s[0] = "white" s[1] = "pink" s[2] = "violet" s[3] = "black"
char **ptr[] = {s, s+1, s+2, s+3}, ***p;
It means --> ptr[0] = s ptr[1] = s+1 ptr[2] = s+2 ptr[3] = s+3
And, p = ptr --> &s
Now ++p;
That means p = p+1 --> ptr+1 --> &(s+1)
Now *p ---> s+1
**p ---> *(s+1) --> s[1] --> "pink"
**p+1 --> "ink".
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