Consider the following code snippet using the fork() and wait() system calls. Assume that the code compiles and runs correctly, and that the system calls run successfully without any errors.

int x = 3;
while(x > 0) {
  fork();
  printf("hello");
  wait(NULL);
  x--;
}

The total number of times the printf statement is executed is _______

Consider a memory management system that uses a page size of 2 KB. Assume that both the physical and virtual addresses start from 0. Assume that the pages 0, 1, 2, and 3 are stored in the page frames 1, 3, 2, and 0, respectively. The physical address (in decimal format) corresponding to the virtual address 2500 (in decimal format) is ________

Consider the following C program:

#include <stdio.h>

int main() {

   int a = 6;

   int b = 0;

   while(a < 10) {

      a = a / 12 + 1;

      a += b;}

   printf("%d", a);

   return 0;}

Which one of the following statements is CORRECT?

Consider the following C program:

#include <stdio.h>
void fX();
int main() {
   fX();
   return 0;}

void fX() {
   char a;
   if ((a = getchar()) != '\n')
       fX();
   if (a != '\n')
       putchar(a);}

Assume that the input to the program from the command line is 1234 followed by a newline character. Which one of the following statements is CORRECT?