2. Arrays in Functions
To
write a function title with an array as a
parameter, use the array declaration
without the size.
Example: int func(int a[])
To call a function with an array as an
argument, just use the array name.
Example: int x = func(grades)
Where int grades[] was previously declared.
3. Functions, continued
Arrays
are, by default, pass by reference.
If your function needs to perform actions
on the entire array, you will need to
specify the array size as a parameter.
Example: int sum(int arr[], int size)
4. Two Dimensional Arrays
A
2D array can be thought of in two ways:
A grid/table of rows and columns of data
An array of arrays
You
can declare it as follows:
e.g: int arrayName[5][4];
Function
call: func(arrayName)
Function title example:
func(int a[][4], int rows)
5. Visualization
The
grid below shows the
addresses/indexes of each cell of an
array c[5][4];
c[0][0]
c[0][1]
c[0][2]
c[0][3]
c[1][0]
c[1][1]
c[1][2]
c[1][3]
c[2][0]
c[2][1]
c[2][2]
c[2][3]
c[3][0]
c[3][1]
c[3][2]
c[3][3]
c[4][0]
c[4][1]
c[4][2]
c[4][3]
6. Visualization, pop quiz
What’s
the value in c[0][0]?
What’s the value in c[2][2]?
What’s the value in c[3][4]?
90
100
85
99
40
50
30
45
77
68
81
65
85
89
91
93
70
65
66
71
![Arrays in Functions
To
write a function title with an array as a
parameter, use the array declaration
without the size.
Example: int func(int a[])
To call a function with an array as an
argument, just use the array name.
Example: int x = func(grades)
Where int grades[] was previously declared.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)