Due

Assignment

1. Based on the following declarations, tell whether each statement below is syntactically legal (yes) or illegal (no).
   int *p;
int *q;
int *r;
int a;
int b;
int c;

   1. p = (int *) malloc(sizeof(int));
   2. *q = (int *) malloc(sizeof(int));
   3. a = (int *) malloc(sizeof(int));
   4. p = r;
   5. q = b;
   6. r = NULL;
   7. c = *p;
   8. p = *a;
   9. q = &c;
   10. *q = NULL;
   11. *p = a;
   12. c = NULL;
   
   
2. The following program has careless errors on several lines. Find and correct the errors, show a diagram of the execution (cross things out that are no longer valid), and show the output where requested.

   #include <stdio.h>
   int main() 
   {
      int *ptr;
      int *temp;
      int x;
   
      ptr = (int *) malloc(sizeof(int));
      *ptr = 4;
      *temp = *ptr;
      printf("%p %p", ptr, temp);
      x = 9;
      *temp = x;
      printf("%d %d", *ptr, *temp);
      ptr = (int *) malloc(sizeof(int));
      ptr = 5;
      printf("%d %d", *ptr, *temp);   // Output: ________________
   }