What is (void*)0?

What is (void*)0?

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1) What will be the output of the following C code?

#include <stdio.h>
 int main()
 {
    char *p = NULL;
    char *q = 0;
    if (p)
 	  printf(" p ");
    else
       printf("nullp");
    if (q)
       printf("q\n");
    else
       printf(" nullq\n");
 }

2) A pointer is

3) Which of the following does not initialize ptr to null (assuming variable declaration of a as int a=0;)?

4) What will be the output of the following C code?

 #include <stdio.h>
 int main()
 {
    int i = 10;
    void *p = &i;
    printf("%f\n", *(float*)p);
    return 0;
 }

5) What will be the output of the following C code?

 #include <stdio.h>
 void main()
 {
    int x = 0;
    int *ptr = &5;
    printf("%p\n", ptr);
 }