invert array

t9e09.invertArr.cpp

// t9e09.invertArr.cpp
// juanfc 2023-11-14
// https://gist.github.com/juanfal/cc28c4728f7179e5e9c90214d09860b0

#include <iostream>
#include <array>
using namespace std;

// consts
const int N=5;

// types
typedef array<float,N> TVec;

// prototypes
void writeArr(TVec a);
void invertArr(TVec& a);

int main()
{
    TVec a = {{1, 2, 3, 4, 5}};
    writeArr(a); cout << endl;
    invertArr(a);
    cout << "after invert:" << endl;
    writeArr(a); cout << endl;
    return 0;
}

void swap(int& a, int& b);
void invertArr(TVec& a)
{
    for (int i = 0; i < N/2; ++i) {
        swap(a[i], a[N-i-1]);
    }
}

void writeArr(TVec a)
{
    for (int i = 0; i < N; ++i)
        cout << a[i] << " ";
}

void swap(int& a, int& b)
{
    int t = a;
    a = b; b = t;
}