C Pointer and Arrays

In C Programming pointers and arrays are very closely related to each other in terms of functionality. Both pointers as well as arrays uses consecutive memory locations to store the data with one key difference in accessing the data. Pointer uses address to access the data stored in a memory location whereas array uses index value to access the data stored in a memory location. Fortunately data or strings initialized using the pointer variable can be accessed using array and vice versa.

Program - Pointers To Initialize, Arrays To Access

#include <stdio.h>
int main()
{
char *ptr ="pointer array", i;
for(i=0; i<13; i++)
printf("%c",ptr[i]);
return 0;
}

C Program - Arrays To Initialize, Pointers To Access

#include <stdio.h>
int main()
{
char arr[13] = "Pointer array", i, *ptr;
ptr = arr;
for(i =0; i<13; i++)
printf("%c",*ptr++);
return 0;
}

Ways To Expressions Pointer Array Elements

There are four different syntaxes are used to express the Pointer and array elements. Two syntaxes for array and two syntaxes for pointer.

• a[i]
• i[a]
• *(a + i)
• *(i + a)

C Program - Access Pointer Array Elements

#include <stdio.h>
int main()
{
int i, a[3] = {10, 11, 12};
for(i = 0; i < 3; i++)
{
printf("%d \t", a[i]);
printf("%d \t", i[a]);
printf("%d \t", *(a + i));
printf("%d \n", *(i + a));
}
return 0;
}

Pointers And Two Dimensional Arrays

The general form of two dimensional array looks arr[i] [j], i represents the number of rows in an array whereas j represents the number of column in an array. The base address of an array is arr[0][0].

C Program - Pointers And Two Dimensional Arrays

#include <stdio.h>
int main()
{
int *iptr;
int i, a[2][2] = {10, 11, 12, 13};
iptr = &a[0][0];
for(i = 0; i < 4; i++)
{
if(i == 2)
{
printf("\n");
}
printf("%d ", *(iptr+i));
}
return 0;
}

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