If the following structure is written to a file using fwrite(), can fread() read

CuriousTab

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Question

If the following structure is written to a file using fwrite(), can fread() read it back successfully?

struct emp
{
    char *n;
    int age;
};
struct emp e={"CuriousTab", 15};
FILE *fp;
fwrite(&e, sizeof(e), 1, fp);

Options
A. Yes
B. No

Correct Answer

No

Explanation

Since the structure contain a char pointer while writing the structure to the disk using fwrite() only the value stored in pointer n will get written. so fread() fails to read.

Structures, Unions, Enums problems

Search Results

1. Can a structure can point to itself?
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

Explanation:

A structure pointing to itself is called self-referential structures.

2. size of union is size of the longest element in the union
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

3. Can we have an array of bit fields?
Options
A. Yes
B. No

Discuss

Correct Answer: No

4. If a char is 1 byte wide, an integer is 2 bytes wide and a long integer is 4 bytes wide then will the following structure always occupy 7 bytes?
```
struct ex
{
    char ch;
    int i;
    long int a;
};
```
Options
A. Yes
B. No

Discuss

Correct Answer: No

Explanation:

A compiler may leave holes in structures by padding the first char in the structure with another byte just to ensures that the integer that follows is stored at an location. Also, there might be 2extra bytes after the integer to ensure that the long integer is stored at an address, which is multiple of 4. Such alignment is done by machines to improve the efficiency of accessing values.

5. It is not possible to create an array of pointer to structures.
Options
A. True
B. False

Discuss

Correct Answer: False

6. Is there easy way to print enumeration values symbolically?
Options
A. Yes
B. No

Discuss

Correct Answer: No

Explanation:

You can write a function of your own to map an enumeration constant to a string.

7. The elements of union are always accessed using & operator
Options
A. Yes
B. No

Discuss

Correct Answer: No

8. Is it necessary that the size of all elements in a union should be same?
Options
A. Yes
B. No

Discuss

Correct Answer: No

9. By default structure variable will be of auto storage class
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

10. Will the following declaration work?

typedef struct s
{
    int a;
    float b;
}s;

Options
A. Yes
B. No

Discuss

Correct Answer: Yes

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Discussion

If the following structure is written to a file using fwrite(), can fread() read it back successfully?
struct emp { char n; int age; }; struct emp e={"CuriousTab", 15}; FILE fp; fwrite(&e, sizeof(e), 1, fp);

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Discussion

If the following structure is written to a file using fwrite(), can fread() read it back successfully? struct emp { char *n; int age; }; struct emp e={"CuriousTab", 15}; FILE *fp; fwrite(&e, sizeof(e), 1, fp);

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If the following structure is written to a file using fwrite(), can fread() read it back successfully?
struct emp { char n; int age; }; struct emp e={"CuriousTab", 15}; FILE fp; fwrite(&e, sizeof(e), 1, fp);