Question 1

Which of the following code fragments causes a memory leak?

Accepted Answer

int *p = malloc(sizeof(int));
int *q = malloc(sizeof(int));
free(p);
q = p;
p = NULL;

Answer

int *p = malloc(sizeof(int));
int *q = NULL;
q = p;
p = malloc(sizeof(int));

Answer

int *p = malloc(sizeof(int));
int *q = p;
free(p);
q = malloc(sizeof(int));

Answer

int *p = NULL;
int *q = malloc(sizeof(int));
p = q;
free(q);
p = malloc(sizeof(int));

Answer

int *p = malloc(sizeof(int));
int *q = NULL;
q = p;
p = NULL;

Question 2

The following command is entered (where $ is the command prompt):

$a.out xyz1 bcde23 qrstuv456

Which replacements for X, Y and Z in the following statement will display only the letter v in the command above?

printf("%c
", X(argv[Y] + Z));

X is [blank_start]*[blank_end]

Y is [blank_start]3[blank_end]

Z is [blank_start]5[blank_end]

Accepted Answer

*

Accepted Answer

3

Accepted Answer

5

Question 3

#include <stdio.h>

int main(void) {
  int i = 11;
  int *ptr1 = &i;
  int **ptr2 = &ptr1; 
  int ***ptr3 = &ptr2;

printf("%p, %p, %p, %p
", ptr1, ptr2, ptr3, &ptr3);

return 0;
}
If the program output is (where _ is part of the address that is not shown):
0x_0b4, 0x_0b8, 0x_0c0, 0x_0c8

At address 0x_0b4 is stored [blank_start]11[blank_end] .
At address 0x_0c8 is stored [blank_start]0x_0c0[blank_end] .

Accepted Answer

11

Accepted Answer

0x_0c0

Pointers and dynamic memory: leaks and argv

Fragen in diesem Quiz (3)