Write a C function countEven() that takes an integer array and the number of elements in the array as parameters, finds and returns the number of even numbers in the array. Prototype: int countEven(int ar[], int n);

C++ program

C++ Write the function with function header double searchId( int idl[], double scorel[], int id, int size) that recieves as arguments the arrays idl (array containing student's IDs) and scorel (array containing their test scores), a student's ID, and the size of the arrays. The arrays are such that the score of the student with ID idl[j] is score [j]. This function searches the array idl for the ID recived, and if it is found, it returns the corresponding test score; otherwise it returns -1. write the function main that does the following: 1.Define the arrays idlist to hold the IDs of 20 students (integer values), and scorelist to hold their test scores (double precision values) 2.Read the 20 student's IDs and their test scores from the standard input into the arrays idlist and scorelist respectively. Each input line will have an ID and a corresponding score. 3.Read the ID of a student and look for their test score (by calling function searchId(). 4.If the ID is found in the list (the…

Randomize_it  Write a function in C++ that takes an array as a parameter and then randomize that array, i.e. shuffles the position of the elements in random order. To randomize the array your function should perform random 100 swaps of any two elements in the array. Return the randomized array from the function.vector<int> randomize(vector<int> input){// code here}