January 27, 2019January 27, 2019 ocjp

Pointer with Example in C language

Pointer

pointers are special type of variables in C Language that stores the Address of another variable:

int *p=&a; //Here address of a will be stored in P

We can access the value of stored variable using * (ex *p). Now a days they are mostly used for Programming in Micro Controllers. We can use %u type specifier (unsigned) to print address block.

#include<stdio.h>
#include<conio.h>

void main()
{
	int *p;
	int x=20,y;

	clrscr();

	p=&x ; // Address of X will be stored to P;

	printf("\nAddress of X is %u and Value is %d",p,*p);
	//*p will print the value of x

	y=30;
	p=&y;
	//Now P points to Y
	printf("\nAddress of Y is %u and Value is %d",p,*p);
	getch();
}

Pointer of any data type always uses 2 Bytes because it is always Integer.

#include<stdio.h>
#include<conio.h>

void main()
{
	float x=9.4;
	float *p=&x;
	clrscr();

	printf("\nSize of X is %d Bytes ",sizeof(x));
	printf("\nSize of P is %d Bytes ",sizeof(p));

	getch();
}