Why doesn't this code work?

Question

https://code.sololearn.com/cnPmoSTncAO9/#cpp

Example Output:
Enter a list of up to 20 integers or -1 to end the list
3 2 4 8 12 5 6 9 0 11 10 13 -1
3 2 4 8 12 5 6 9 0 11 10 13
Enter a value and a position to insert: 18 5
3 2 4 8 12 18 5 6 9 0 11 10 13
Enter a value to delete from the array: 18
3 2 4 8 12 5 6 9 0 11 10 13
Enter a value to append: 15
3 2 4 8 12 5 6 9 0 11 10 13 15

I have to add all these part:
Start with the simplest function, e.g., the one to search the content of an array.
The suggested order to write the function is:
Function to search for a value in the array
Function to fill an array with positive integers
Function to delete an element from the array: after deletion, the array should have no holes.
Function to insert an element into the array
Write one function, test it to make sure it really works, and then move on to next function.
Write comments to 1) document your algorithms and design, 2) make your code readable, 3) debug code.

Answer 1

if I run the code it is complaining about the number of arguments in fillArray. You defined it with 3 arguments, and call it with 2.