01_sizeof

1. Team Emertxe
Pre-Processing

2. Assignment 1

3. Assignment 1

4. Assignment 1
WAP to define a macro SIZEOF(x),without using sizeof
operator.

5. Assignment 1
WAP to define a macro SIZEOF(x),without using sizeof
operator.
Input:

6. Assignment 1
WAP to define a macro SIZEOF(x),without using sizeof
operator.
Input: None

7. Assignment 1
WAP to define a macro SIZEOF(x),without using sizeof
operator.
Input: None
Output:

8. Assignment 1
WAP to define a macro SIZEOF(x),without using sizeof
operator.
Input: None
Output: Print size of different data types

9. How will you find the size of an data type without using
sizeof operator?
Assignment 1

10. How will you find the size of an data type without using
sizeof operator?
 You can make use of address of respective variable.
 Example: int x = 5;
Assignment 1
5
x
1000 1004

11. How will you find the size of an data type without using
sizeof operator?
 You can make use of address of respective variable.
 Example: int x = 5;
 Difference of 1004 and 1000 is 4, so, use these addresses to get
the size of the data type i.e., (&x+1) – (&x)
Assignment 1
x
1000 1004
5

12.  Example: int x = 5;
 Now, what is the output when you do (&x+1) – (&x) ?
&x+1 - &x = 1000 + 1 * sizeof(int) – 1000
= 1000 + 1 * 4 – 1000
= 1004 – 1000
= 4 / sizeof(int)
= 4 / 4
&x+1 - &x = 1
 But, we want 4 right? So, what needs to be done to get 4?
Assignment 1
x
1000 1004
5

13.  Example: int x = 5;
 Now, what is the output when you do (&x+1) – (&x) ?
&x+1 - &x = 1000 + 1 * sizeof(int) – 1000
= 1000 + 1 * 4 – 1000
= 1004 – 1000
= 4 / sizeof(int) <- Replace sizeof(char)
= 4 / 1
&x+1 - &x = 4
 How can we change it to char?
Assignment 1
x
1000 1004
5

14.  Example: int x = 5;
 Now, what is the output when you do (&x+1) – (&x) ?
&x+1 - &x = 1000 + 1 * sizeof(int) – 1000
= 1000 + 1 * 4 – 1000
= 1004 – 1000
= 4 / sizeof(int) <- Replace sizeof(char)
= 4 / 1
&x+1 - &x = 4
 Typecast: (char *)(&x+1) – (char *)(&x)
Assignment 1
x
1000 1004
5

15. Sample execution:-
Assignment 1

16. Sample execution:-
Assignment 1

17. Assignment 1
Pre-requisites:-

18. Assignment 1
Pre-requisites:-
⮚ Macros

19. Assignment 1
Pre-requisites:-
⮚ Macros
⮚ Pointers

20. Assignment 1
Pre-requisites:-
⮚ Macros
⮚ Pointers
Objective:-

21. Assignment 1
Pre-requisites:-
⮚ Macros
⮚ Pointers
Objective:-
⮚ To understand the concepts of Macros in preprocessing

22. Team Emertxe
Thank you