pointer to two,three dimensional array

 

Pointer to two dimensional array in c programming

Examples of pointers to 2 dimensional array:


What will be output if you will execute following code?


#include<stdio.h>

void main(){

long array[][3]={7l,14l,21l,28l,35l,42l};

long int (*ptr)[2][3]=&array;

printf("%li ",-0[1[0[ptr]]]);


return 0;

}

Output: -28

Explanation:

-0[1[0[ptr]]]

=-1[0[ptr]][0] //From rule array[i]=i[array]

=-0[ptr][1][0]

=-ptr [0] [1] [0]

=-*ptr [0] [1] //From rule array[i]=*(array+i)

=-*(&array) [0] [1]

=-(&array) [0] [1][0]

=-(*&array)[1][0] //From rule *&p=p

=-array[1][0]

array[1][0] means 1*(3)+ 0 = 3^rd element of array starting from zero i.e. 28

 

Pointer to three dimensional array in c programming

Examples of pointers to 3 dimensional array:


#include<stdio.h>

int main(){

const array[2][3][3]={0,1,2,3,4,5,6,7,8,9,10,11,12};

int const (*ptr)[2][3][3]=&array;

printf("%d ",*(*(*ptr)[1]+2));


return 0;

}

Output: 11

Explanation:

In this example:

array [2][3][3]:It is three dimensional array and its content are constant integers.

ptr: It is pointer to such three dimensional array whose content are constant integer.

Pictorial representation:

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