I don't know how does this code work? Please help me understand the behaviour of this code in C

Question

I don't know how it works correctly...... Without error.....

Please focus on my comment on that code too....

https://code.sololearn.com/cwJ91wT1iP2k/?ref=app

Answer 1

a is a 2 dimentional array, so it needs 2 coordinates to give a value.
a[0][0] is the first value
a[0] is the address of the first sub-array

a[0] would hold a value if 'a' was a one dimentional array

Answer 2

a[0] means a + 0*7 so it is indeed an address.
It doesn't store a value, becouse it is a 2d array

Answer 3

Based on the comments in your code, you seem to have the misunderstanding that

a[ 0 ] = *( a + 1 )

which is wrong, the index itself is the amount of offset to 'a', you don't add one to it, thus

a[ 0 ] = *( a + 0 )
a[ 1 ] = *( a + 1 )
...

If an array decays to a pointer, it points to the first element of the array. Therefore, a[ 0 ] is a viable address here.

Answer 4

To add to the other answers this is the part if the course that explains pointer arithmetic for arrays
https://www.sololearn.com/learn/C/2962/

Answer 5

Shadow sorry it's my mistake,while creating comments in code....😅

Now,I rectify that...

but
how does array decays to pointer...?
in which condition it will happen like this?

please help me to understand....

Answer 6

😃 thanks a lot Angelo Landi now I understood that.....

but,can you tell,how did you know that a[0] is considered as a address of first sub array..

where did you learn these at all?
please tell me

Answer 7

Angelo,Shadow Benjamin Jürgens please also see this thread...

Help me to understand the doubt
https://www.sololearn.com/Discuss/2603934/?ref=app