Average
Given an array of integers, we want to implement a method to calculate the average of all the numbers in the array. The average of a set of numbers is the sum of those numbers divided by the count of numbers in the set.
Solution
Java
In Java, we can use a for
loop to calculate the sum of the elements in the array and then divide it by the length of the array.


C++
In C++, we can use the STL function std::accumulate
to calculate the sum, and then divide by the number of elements to calculate the average.


Python
In Python, we can use the builtin sum
function to calculate the sum and then divide by the length of the list to find the average.


In each language, we’re following the same fundamental approach: calculating the sum of the numbers and dividing by the count to get the average. The differences in implementation are mostly due to languagespecific features and idioms.
Without Using Builtin Functions
Below are revised solutions for calculating the average of an array of integers without using any builtin functions.
Java:
In Java, we can iterate through the array using a for
loop to calculate the sum and then divide by the length of the array.


C++
In C++, we can use a loop to iterate through the elements in the vector and add them together, then divide by the size of the vector to find the average.


Python
In Python, we can use a for
loop to iterate through the list and add the numbers together. Then we can divide the sum by the length of the list.


Each of these solutions manually calculates the sum of the elements and then divides by the number of elements in the collection. They provide a clear, simple approach to calculating the average without relying on any languagespecific builtin functions.
Coding Skill Exercise #13
Average
Implement a method to find the average of all the numbers in an array.
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