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Source Code
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#include <stdio.h>
int main()
{
int number = 20;
int *ptr1 = &number;
int *ptr2;
int *ptr3=0;
int *ptr4=NULL;
if(ptr1 == 0)
printf("ptr1: NULL\n");
else
printf("ptr1: NOT NULL\n");
if(ptr2 == 0)
printf("ptr2: NULL\n");
else
printf("ptr2: NOT NULL\n");
if(ptr3 == 0)
printf("ptr3: NULL\n");
else
printf("ptr3: NOT NULL\n");
if(ptr4 == 0)
printf("ptr2: NULL\n");
else
printf("ptr2: NOT NULL\n");
return 0;
}
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