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#include <stdio.h>
int main()
{
int a[0],b[4][0];
printf("%d %d ",sizeof(a),sizeof(b));
}
//output
0 0
what is the significance of a[0] , why also 2d array of size 0 is allowed?
Neither C nor C++ allow arrays of zero length, so your program is ill-formed.
(E.g. C++11, 8.3.4/1: “[the array size] shall be greater than zero”.)
(As one point of rationale: An array of zero length would be tricky and confusing to reconcile with the requirement that each object have a unique address.)
As @sidyll points out, zero-length arrays are available as an extension in GCC.