Uses of C comma operator [duplicate]

Answer 1

Found it in array initialization:

In C what exactly happens if i use () to initialize a double dimension array instead of the {}?

When I initialize an array a[][]:

int a[2][5]={(8,9,7,67,11),(7,8,9,199,89)};

and then display the array elements.

I get:

11 89 0 0 0 
0 0 0 0 0