Differentiate between pointers and arrays? Write a C program to displa

1.	Differentiate between pointers and arrays? Write a C program to display the contents of an array using a pointer arithmetic.
Answer» Pointer and arrays: Pointers and arrays are very closely linked in C. Consider the following statements: int a[10], x; int ptr; / ptr is a pointer variable/ ptr = &a[0]; / ptr points to address of a[0] / x = ptr; /* x = contents of ptr (a[0] in this case) / A pointer is a variable so we can do ptr = a and ptr++ ; while an array is not a variable so statements a = pa and a++ are illegal. A C program to display the contents of an array using a pointer arithmetic is listed below: //display the contents of an array using pointer #include < stdio. h > void main() { int p,sum,i; static int x[5] = {5,9,6,3,7}; i=0; p=x; sum=0; clrscr(); printf("\nElement Value Address\n\n"); while(i<5) { printf(" x[%d] %d %u\n",i,p,p); sum+=p; i++; *p++; } printf("\n Sum = %d\n",sum); printf("\n &x[0] = %u\n",&x[0]); printf("\n p = %u\n",p); getch(); }

Differentiate between pointers and arrays? Write a C program to display the contents of an array using a pointer arithmetic.

Answer»

Pointer and arrays:

Pointers and arrays are very closely linked in C. Consider the following statements:

int a[10], x;

int *ptr; /* ptr is a pointer variable*/

ptr = &a[0]; /* ptr points to address of a[0] */

x = *ptr;

/* x = contents of ptr (a[0] in this case) */

A pointer is a variable so we can do

ptr = a and ptr++ ;

while an array is not a variable so statements

a = pa and a++ are illegal.

A C program to display the contents of an array using a pointer arithmetic is listed below:

//display the contents of an array using pointer

#include < stdio. h >

void main()

{

int *p,sum,i;

static int x[5] = {5,9,6,3,7};

i=0;

p=x;

sum=0;

clrscr();

printf("\nElement Value Address\n\n");

while(i<5)

{

printf(" x[%d] %d %u\n",i,*p,p);

sum+=*p;

i++;

*p++;

}

printf("\n Sum = %d\n",sum);

printf("\n &x[0] = %u\n",&x[0]);

printf("\n p = %u\n",p);

getch();

}