Answer to Question #208711 in C++ for SimpNick

Question

Write a template function that returns the average of all the elements of an array. The arguments to the function should be the array name and the size of the array (type int). In main(), exercise the function with arrays of type int, long, double, and char.

Answer 1

#include <iostream>

template<typename T>
T average(const T* data, int size)
{
    T sum = data[0];
    for(int i = 1; i < size; ++i)
    {
        sum += data[i];
    }

    return sum / size;
}

int main()
{
    const int ARRAY_SIZE = 5;
    int    arrInts   [ARRAY_SIZE] = {1, 2, 3, 4, 5};
    long   arrLongs  [ARRAY_SIZE] = {1L, 2L, 3L, 4L, 5L};
    double arrDoubles[ARRAY_SIZE] = {1.0, 2.0, 3.0, 4.0, 5.0};
    char   arrChars  [ARRAY_SIZE] = {0x01, 0x02, 0x03, 0x04, 0x05};

    std::cout << "Average of arrInts:    " << average(arrInts,    ARRAY_SIZE) << "\n";
    std::cout << "Average of arrLongs:   " << average(arrLongs,   ARRAY_SIZE) << "\n";
    std::cout << "Average of arrDoubles: " << average(arrDoubles, ARRAY_SIZE) << "\n";
    std::cout << "Average of arrChars:   " << static_cast<int>(average(arrChars, ARRAY_SIZE)) << "\n";
    
    return 0;
}