1. Arrays And Functions

2. Pop Quiz
What does this print?

3. Pop Quiz
What does this print?

4. Array Parameters Array parameters passed as base address
Function uses that to find elements

5. Debugging
Need to tell debugger to display parameter as array:

6. Array Parameters Array parameters always act like passed by reference
Modification in function modifies original

7. Arrays by Ref Declare array as const to prevent changes in function
ALWAYS do this if function does not have to modify array!!!

8. I take the address of an array of exactly 5 integers
Size
This function is dumb:
I take the address of an array of exactly 5 integers

9. I take the address of any size array of integers
This function is broken:
I take the address of any size array of integers
Crap

10. Size Parameter
Must pass size as second parameter
No other way to know

11. Samples
Add up elements in array

12. Debugger Trick
Can make debugger show you "current item"

13. Samples 10 9 Swap two elements 1 2 3 4 5 6 7 8 Don't need size
Modify original array – non const 1 2 3 4 5 6 7 8 10 9

14. Arrays Can't Be Returned
Function can not have return type of array

15. Arrays Can't Be Returned
Solution : take in existing array as non const parameter:

16. Samples
Make a Reversed Copy
Const original, non-const empty array

17. Samples
Find smallest value 1 2 3 4 5 6 7 8 10 9

18. Samples 10 9 Index more powerful than value 1 2 3 4 5 6 7 8
Min value = 4
No easy way to find location
Min element is at 7
Can easily get value : array[minLocation]
Can manipulate based on location 1 2 3 4 5 6 7 8 10 9

19. Samples
Find index instead of value:

20. Summary Passing array to function passes memory address
Always "by reference"
Need to pass in size
No returning arrays
Take as parameter & change