1. How large is the Person struct on a 32-bit machine? a)36 bytes b)38 bytes c)4

Question

1. How large is the Person struct on a 32-bit machine?

a)36 bytes

b)38 bytes

c)40 bytes

d)42 bytes

2. Which of the following is equal to y->id?

a)&y->id

b)&x.id

c)x.id

d)*x->id

3. Which of the following is a valid replacement for line 7?

a)scanf(“%c”, &x->gender);

b)scanf(“%c”, &((*y).gender));

c)scanf(“%c”, x.gender);

d)scanf(“%s”, &y->gender);

4. If we input “Greg” for the name. What is the value of

*(y->name)?

a)The address of the array containing “Greg”

b)‘G’

c)The address of y

d)Undefined

5. What is the type of (&*y->name)?

a)char

b)struct Person*

c)char**

d)char*

Could u help me to solve these questions?

#include stdio.h #pragma warning(disable : 4996) Accessing Members of a Struct struct Person int id; char name [30]; char gender; // need padding? int main() f 1 2 4 5 6 7 8 9 y = &x; scanf("%d", &(y->id)); printf("%din.. , x.id); scant( "%s'. , (*y).name); printf("%s ", (8x)-name); fflush (stdin); x,gender = get char(); printt ntfCXc ", y-gender): return 0;

Explanation / Answer

1.
The correct option for 1 bit is (a)
Explanation:
Ths size of the Structure Person is 36 bytes.
The Person structure contains
a character (1byte), a character array (30bytes)
and integer (4bytes ) in 32-bit machine.
Since C-structure uses padding alignment
to properly get the addresses.
1 byte is added immediately after character
byte
char(1byte)+padding(1byte)+char array(30bytes)+
integer(4bytes)=36=8*4bytes.
32-bit systems process in word size of lenght of 4 bytes.

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2.
The correct option is (d)

The d option *x->id is equal to y->id.
since y=&x, the y takes address of the
structure x.
The pointer x is pointer to a variable.
So the *x->id is the correct option.
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3.
The correct option is (b)

The variable y is takes the address of x variable.
To read a character at the gender , we need
address to store &.
So the correct answer is
scanf("%c",&((*y).gender));

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4.
The correct option is (c) The address of y

The *(y->name) prints the address of the name in the structure pointer
variable y.

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5.

The correct option is (c) The address of d
In c, a character array is treated as pointer , since
the name variable points to the starting address of the variable.
To read pointer to pointer then char ** type is used.

Hope this helps you

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