Arrays of arrays

It is possible to have an array where each element is an array.

float grades [10] [50];

grades is an array of 10 arrays, each with 50 grades; this may represent grades for 10 different classes.

float prices [5] [100];

an array of 5 arrays with 100 prices each. This may represent the price list for 5 different stores. Each store has a price list with 100 items.