What is the output of the following C program?

#include <studio.h>
int main() {
  double a[2]={20.0, 25.0}, *p, *q;
  p = a;
  q = p + 1;
  printf("%d,%d", (int)(q - p), (int)(*q - *p));
  return 0;}

Consider the following ANSI C program:

#include <stdio.h>

#include <stdlib.h>

struct Node{

int value;

struct Node ⋆next;};

int main(){

struct Node ⋆boxE, ⋆head, ⋆boxN; int index = 0;

boxE = head = (struct Node ⋆) malloc (sizeof(struct Node));

head -> value = index;

for (index = 1; index <=3; index++){

boxN = (struct Node ⋆) malloc(sizeof(struct Node));

boxE -> next = boxN;

boxN -> value = index;

boxE = boxN; }

for (index = 0; index <= 3; index++) {

printf("value at index %d is %d\m", index, head -> value);

head = head -> next;

printf("value at index %d is %d\n", index + 1, head -> value);}}

Which one of the statement below is correct about the program ?

Consider the following C program:

       #include < stdio.h >
       int main()
       {
           int a[] = {2, 4, 6, 8, 10} ;
           int i, sum = 0, *b = a + 4 ;
           for (i = 0; i < 5; i++)
                 sum = sum + (*b - i) - *(b - i) ;
           printf ("%d\n", sum) ;
           return 0 ;
        }

The output of the above C program is _________.

Consider the following C program:

#include< stdio.h >
void fun1(char *s1, char *s2){
  char *tmp;
  tmp = s1;
  s1 = s2;
  s2 = tmp;
}
void fun2(char **s1, char **s2){
  char *tmp;
  tmp = *s1;
  *s1 = *s2;
  *s2 = tmp;
}
int main(){
  char *str1 = "Hi", *str2 = "Bye";
  fun1(str1, str2); printf("%s %s ", str1, str2);
  fun2(&str1, &str2); printf("%s %s", str1, str2);
  return 0;
}

The output of the program above is