If a char is 1 byte wide, an integer is 2 bytes wide and a long integer is 4 byt

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Question
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

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.

Structures, Unions, Enums problems

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4. Bit fields CANNOT be used in union.
Options
A. True
B. False

Discuss

Correct Answer: False

Explanation:

The following is the example program to explain "using bit fields inside an union".

#include<stdio.h>

union Point
{
  unsigned int x:4;
  unsigned int y:4;
  int res;
};

int main()
{
   union  Point pt;

   pt.x = 2;
   pt.y = 3;
   pt.res = pt.y;

   printf("\n The value of res = %d" , pt.res);

   return 0;
}
// Output: The value of res = 3

9. 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

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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; };

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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; };

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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; };