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Please help with writing the following code. I’m using C++ and vim. Include plenty of comments. Thanks!
Don’t use any loops when writing your recursive functions. If you do, there’s a very good chance your function won’t be truly recursive. Also don’t use any static variables. You are free to use helper methods on either of the projects. Write a recursive function named summer that takes two parameters – an array of doubles and the size of the array – and returns the sum of the values in the array. The size parameter does not have to be the actual size of the array. It will be at the top level, but at the lower recursive levels it can be the size of the sub-array being worked on at that level. The file must be called: summer.cpp
Expert Answer
#include<iostream>
using namespace std;
//recursive function
double summer(double arr[],int size)
{
//this is the base condition to terminate
//from recursive method
//when size becames 0, then there are no elements to sum up
if(size==0)
return 0;
//if size not 0, then
else
//sum up last indexed element with remaining elements in the array
return arr[size-1]+summer(arr,size-1);
//this will be calculated like this
//1. 19+summer(arr,3)
//2. 19+11+summer(arr,2)
//3. 19+11+12.8+summer(arr,1)
//4. 19+11+12.8+23+summer(arr,0)
//5. base condition
// 19+11+12.8+23+0
}
//main function
int main()
{
//array with double data type
double arr[]={23.0,12.8,11,19};
//displaying array’s elements
cout<<“The array elements are:n”;
for(int i=0;i<4;i++)
cout<<arr[i]<<” “;
cout<<“n”;
//calling summer recursive funtion with
//parameters array and sizeof the array
cout<<“sum:”<<summer(arr,sizeof(arr)/sizeof(arr[0]));
//sizeof(arr)/sizeof(arr[0]) will be size of the array
}
