String[][] val = {{"0","6","10"},{"1","10","10"},{"1","10","14"},{"1","10","14"},{"1","10","14"}};
(sizeof val / sizeof val[0]) // This should evaluate to 5
(sizeof val[0] / sizeof val[0][0]) // This should evaluate to 3
You have to divide by the element size because 'sizeof' gives the size in bytes and you want the size in elements.