1. Write a C++ function, smallestIndex, that takes as parameters an int array and its size and returns the index of the first occurrence of the smallest element in the array. Also, write a program to test your function.

2. Write a C++ function that takes an array of integers as a parameter and return the number of odd integers in the array. Write main() program to test the function.

3. Write a function that takes a two-dimensional array of integers and two row indices, rowA, and rowB. The function should swap rowA and rowB. Test your function. Your testing program should print the array before and after the swapping.

4. Write a function that takes a two-dimensional array of integers and a col index. The function should return the average values in the column. Test your function.