C Language - Null Pointer

 

#include <stdio.h>

int main()

{

int a=345;

int b=53;

int c= 34;

int *ptr = &a;

int *shan = &b;

int *ali = NULL;

printf ("The value of a is %d\n", *ptr);

printf ("The address of a is %d\n", ptr);

printf ("The value of b is %d\n", *shan);

printf ("The address of b is %d\n", shan);

printf ("The address of c is %d\n", ali);

if (ali !=NULL) 

{

printf ("The value of c is %d\n", *ali);

} 

else {

printf ("The pointer is a NULL pointer and cannot be derefernced");

}

}

// ScreenShots: