2D Arrays Quick Guide

Application	Example	Notes
A declaration statement creates a composite variable to store a group of values with multiple dimensions.		needs a data type, indentifier, and two sizes between square brackets the sizes between the square brackets must be of type int the first size is the number of rows the second size is the number of columns best practices include using macros for the sizes
A single array element is used for individual array values.		needs a indentifier and two indexes between square brackets the indexes between the square brackets must be of type int the first index is for the row number (starting at 0) the second index is for the column number (starting at 0) this expression should NOT include a data type
all array elements must be accessed one at a time		needs nested for loops to repeat accessing each element the outer loop is generally for the controlling the row index the inner loop is generally for the controlling the column index the indexes will usually start at 0 and continue until size - 1
NOTE: 2D Arrays can also use int variables as the sizes during declaration. NOTE: 2D Arrays can also have arbitrarily large sizes for any dimension for which we can't determine the number of objects before storing them in the array.