An uninitialized pointer is a pointer which points unknown memory location while null pointer is pointer which points a null value or base address of segment. For example:
int *p; //Uninitialized pointer
int *q= (int *)0; //Null pointer
#include<stdio.h>
int *r=NULL; //Null pointer
What will be output of following c program?
#include<string.h>
#include<stdio.h>
int main(){
char *p; //Uninitialized pointer
char *q=NULL; //Null pointer;
strcpy(p,”cquestionbank”);
strcpy(q,”cquestionbank”);
printf(“%s %s”,p,q);
return 0;
}
Output: cquestionbank (null)
