Question

**In racket**, implement a tail-recursive function
called sum-pairs that creates a new list by adding the elements of
an input list in pairs. That is the first element of the resulting
list is the sum of the first two elements of the input, the second
element of the resulting list is the sum of the 3rd and 4th
elements of the input, and so on. If there is an odd number of
elements, then the last element remains unchanged. As an example,
(sum-pairs ’(1 2 3 4 5)) will result in ’(3 7 5). It may be helpful
to create helper functions.

RACKET!!!

Answer #1

>Answer

>Given

#include <iostream>

#include <vector>

#define N 100

using namespace std;

vector<int> tail_recursive(vector<int> vec){

int l= vec.size();

vector<int> v2;

for(int i=0;i< l - 1;i+=2){

v2.push_back(vec[i] + vec[i+1]);

}

if(l%2 !=0) v2.push_back(vec[l - 1]);

return v2;

}

int main()

{

vector<int> vec, vec2;

for(int i=0;i<5;i++){

vec.push_back(i+1);

}

cout<<"Initial Value: ";

for(int i=0;i<vec.size();i++){

cout<<vec[i]<<" ";

}

cout<<endl;

vec2 = tail_recursive(vec);

int l= vec2.size();

cout<<"Tail Recursive Value: ";

for(int i=0;i<l;i++){

cout<<vec2[i]<<" ";

}

cout<<endl;

return 0;

}

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