In my program it program the array prints from ascending order, but i'm trying to modify it so it prints in descending order

Question

In my program it program the array prints from ascending order, but i'm trying to modify it so it prints in descending order. Could use some help.

#include <iostream>
#include <algorithm>
int main()
{
    const int length = 5;
    int array[length] = {35, 67, 75, 60, 11};

    std::sort(std::begin(array), std::end(array));
    for(int i = 0; i < length; i++)
    {
      std::cout << array[i] << ' ';
    }

    return 0;
}

look at this https://stackoverflow.com/questions/9025084/sorting-a-vector-in-descending-order — samini, Sep 02 '19 at 06:34

score 5 · Answer 1 · answered Sep 02 '19 at 06:33

5

std::sort can take 3rd parameter, a comparator, which will say how to order the elements inside the array. You can pass one of standard comparators inside your call to std::sort

std::sort(std::begin(array), std::end(array), std::greater<int>{});

answered Sep 02 '19 at 06:33

Kaldrr

2,780
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Tony Tannous · Answer 2 · 2019-09-02T06:51:04.860

0

std::reverse(std::begin(array), std::end(array));

Another solution using lambda expression

std::sort(std::begin(arr),std::end(arr),[](int a, int b) {
    return b < a; 
});

Output:

75 67 60 35 11

edited Sep 02 '19 at 06:51

answered Sep 02 '19 at 06:34

Tony Tannous

14,154
10
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86

score 0 · Answer 3 · answered Sep 02 '19 at 06:51

Another alternative is to go all in on iterators. You already know std::begin. Now it is time to meet its mirror-universe double: std::rbegin

for(auto it = std::rbegin(array); it != std::rend(array); ++it)
{
  std::cout << *it << ' ';
}

Documentation for rbegin

Documentation for rend

In my program it program the array prints from ascending order, but i'm trying to modify it so it prints in descending order

3 Answers3