C++ Multi dimensional array indexing

Question

I have read this post. However, I could not get the meaning for the following declaration.

Lets say I declare this:

Declaration 1:    int jimmy [HEIGHT][WIDTH];

   Accessing 1:   jimmy[n][m]

Declaration 2: int jimmy [HEIGHT * WIDTH];


 Accessing 2:  jimmy[n*WIDTH+m]

Declaration 1 and accessing 1, and Declaration 2 and accessing 2 are same src.

However, what is the meaning jimmy[n,m]? I wrote the code it gives me address. Couldnt get any useful info. Can some one say what does it mean?

How does the Comma Operator work, What is the proper use of the comma operator?, When to Overload the Comma Operator? — phuclv
– phuclv, Commented Mar 29, 2016 at 4:21

kfsone · Accepted Answer · 2016-03-29 03:53:37Z

10

C++ has a comma operator which evaluates the thing on the left, discards the return value, and then evaluates to the thing on the right.

You could write (see http://ideone.com/hpQxWI)

int i = (1, 2, 3, 4);
std::cout << i;

and you would print out 4.

So

jimmy[n,m]

means

jimmy[m]

answered Mar 29, 2016 at 3:53

kfsone

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