Ambiguity in array of 2d arrays declaration in C

General Tech Bugs & Fixes 2 years ago

0 2 0 0 0 tuteeHUB earn credit +10 pts

5 Star Rating 1 Rating

Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

Take Quiz To Earn Credits!

Turn Your Knowledge into Earnings.

tuteehub_quiz

Answers (2)

Post Answer
profilepic.png
manpreet Tuteehub forum best answer Best Answer 2 years ago

 

I'm going through a code where I encountered this line of code. I'm not able to understand unsigned char (*data)[int][int] declared as argument in the function, if I consider this piece of code as an array of two-dimensional arrays(I'm passing array of 2d arrays) and then if I modify the code as unsigned char *data[int][int] should this not work?.

profilepic.png
manpreet 2 years ago

No, it won't work. Because these declarations declare different types which are incompatible.

unsigned char (*data)[2][2]: declare data as pointer to array 2 of array 2 of unsigned char

+---+      +---+---+
|  -+----->|   |   |
+---+      +---+---+
data       |   |   |
           +---+---+
           unsigned char [2][2]

unsigned char *data[2][2]: declare data as array 2 of array 2 of pointer to unsigned char

                  +---+---+
 unsigned char <---+-  |  -+---> unsigned char
                   +---+---+
 unsigned char <---+-  |  -+---> unsigned char
                   +---+---+
                     data


 

 

 

 

 

0 views   0 shares

No matter what stage you're at in your education or career, TuteeHub will help you reach the next level that you're aiming for. Simply,Choose a subject/topic and get started in self-paced practice sessions to improve your knowledge and scores.