is there a way to use the ternary operator with arrays?-CodePudding

I was trying to write an algorithm that would take 2 numbers as input and output them in ascending order using the ternary operator but on line 20:24 it tells me: "error: invalid array assignment". Can someone help me? many thanks in advance.

#include <iostream>

using namespace std;

int main()
{
     int a, b;
     int c[2];
     int d[2];
     int e[2];
     cout << "inserire il primo numero: ";
     cin >> a;
     cout << "inserire il secondo numero: ";
     cin >> b;

     c[0] = b;
     c[1] = a;
     d[0] = a;
     d[1] = b;
     e = (a > b) ? c : d;
     cout << e;
}

CodePudding user response：

as long as the left side has the appropriate = operator, you can write this statement. C-Style arrays do not have this as you try to change their pointer. read more.

you can use std::array<int, 2>, which has the operator= and offers many benefits (read more):

#include <iostream>
#include <array>

int main() {
    int a, b;
    std::array<int, 2> c;
    std::array<int, 2> d;
    std::array<int, 2> e;

    std::cout << "inserire il primo numero: ";
    std::cin >> a;
    std::cout << "inserire il secondo numero: ";
    std::cin >> b;

    c = { b, a };
    d = { a, b };

    e = (a > b) ? c : d;

    for (auto& i : e) {
        std::cout << i << ' ';
    }
}

read here why you shouldn't use namespace std;.

CodePudding user response：

Ternay operator works fine. In your code, the problem was in assigning the array. You can't assign an array like that.

One of the ways you can follow:

#include <iostream>

using namespace std;

int main()
{
     int a, b;
     int c[2];
     int d[2];
     int e[2];
     cout << "inserire il primo numero: ";
     cin >> a;
     cout << "inserire il secondo numero: ";
     cin >> b;

     c[0] = b;
     c[1] = a;
     d[0] = a;
     d[1] = b;
     (a > b) ? memcpy(e, c, sizeof c) : memcpy(e, d, sizeof d);

     cout << e[0] << " " << e[1] << endl;
}

Please check the below URL to learn more ways for assigning one array to another other than running a loop.

How to assign values of array to another array(making copy)