Average using highest numbers

[addonexus]

I am curious as to how I can get a sum of 3 numbers, however it only takes the 2 highest into account. The user inputs 3 numbers and it needs to use only the 2 highest numbers.


for example:

#include "stdafx.h"
#include <iostream>
using namespace std;

float numOne;
float numTwo;
float numThree;

int main()
{
cout << "Enter the first number :";
cin >> numOne;

cout << "Enter the second number :";
cin >> numTwo;

cout << "Enter the third number :";
cin >> numThree;

return 0;
}



Then the code goes on to add the two highest numbers only.


Not asking for someone to give me the answer, rather to guide me through it.

[JLBorges]

#include <iostream>

int main()
{
    // step 1. accept three numbers from the user
    int first ;
    std::cout << "enter the first number: " ;
    std::cin >> first ;

    int second ;
    std::cout << "enter the second number: " ;
    std::cin >> second ;

    int third ;
    std::cout << "enter the third number: " ;
    std::cin >> third ;

    // step 2. determine the lowest of these three numbers
    int lowest = first ;
    if( second < lowest ) lowest = second ;
    if( third < lowest ) lowest = third ;

    // step 3. find the sum of the two highest numbers
    //         Q: why does this give us the sum of the two highest numbers?
    const int sum_2_highest = first + second + third - lowest ;

    // step 4. compute their average note: divide by 2.0 to avoid integer division
    const double average_2_highest = sum_2_highest / 2.0 ;

    // step 5. print the results
    std::cout << "sum of the two highest numbers: " << sum_2_highest << '\n'
              << "                 their average: " << average_2_highest << '\n' ;
}