The document discusses multi-dimensional and two-dimensional lists. It explains that two-dimensional lists can represent tables of values arranged in rows and columns, with each element identified by two indices - the row and column. It provides examples of declaring and initializing two-dimensional lists, including nested list initializers. It also covers passing two-dimensional arrays as function parameters.

1. MULTIDIMENSIONAL ARRAYS

2. MULTI-DIMENSIONAL LISTS
 Two-dimensional lists are often used to represent tables of
values consisting of information arranged in rows and
columns.
 Can define one list for multiple sets of data
 List of Lists
 Identify a particular table element with two indices.
 By convention, the first identifies the element’s row and the second its
column.
 Multidimensional arrays can have more than two dimensions.
 Code: declaratory is number of rows by number of columns:
list[ROWS][cols]
 First declarator is number of rows; second is number of columns

3. TWO-DIMENSIONAL LIST REPRESENTATION
exams[4][3]
 Use two subscripts to access element:
exams[2][2] = 86
exams[0][0] exams[0][1] exams[0][2]
exams[1][0] exams[1][1] exams[1][2]
exams[2][0] exams[2][1] exams[2][2]
exams[3][0] exams[3][1] exams[3][2]
columns
r
o
w
s

4. EXAMPLE TWO-DIMENSIONAL LIST

5. TWO-DIMENSIONAL LIST INITIALIZATION
 Multidimensional listss can be initialized with list
initializers in declarations.
 A two-dimensional list b with two rows and two columns
could be declared and initialized with nested list
initializers as follows:
 exams= [ [84, 78],
[92, 97] ]
 Rows can have different lengths.
84 78
92 97

6. DECLARING MULTIDIMENSIONAL LISTS

7. TWO-DIMENSIONAL ARRAY AS PARAMETER,
ARGUMENT
 Use array name as argument in function call:
getExams(exams, 2)
 Use empty [] for row, size declarator for column in
prototype, header:
const int COLS = 2;
// Prototype
void getExams(int [][COLS], int);
// Header
void getExams(int exams[][COLS], int rows)

8. SUMMING ALL THE ELEMENTS IN A TWO-DIMENSIONAL LIST
 Question: How could we sum all the elements in a 2D list?