Truncate elements during conversion

compare.cc

#include <iostream>
#include <string>
#include <vector>

using namespace std;

#define IndexType int

typedef struct Int1 { IndexType x[1]; } Int1;
typedef struct Int2 { IndexType x[2]; } Int2;
typedef struct Int3 { IndexType x[3]; } Int3;
typedef struct Int4 { IndexType x[4]; } Int4;
typedef struct Int5 { IndexType x[5]; } Int5;

int compInt1(const void *elem1, const void *elem2) {
    Int1 f = *((Int1 *) elem1);
    Int1 s = *((Int1 *) elem2);
    if (f.x[0] > s.x[0]) return 1;
    if (f.x[0] < s.x[0]) return -1;
    return 0;
}

int compInt2(const void *elem1, const void *elem2) {
    Int2 f = *((Int2 *) elem1);
    Int2 s = *((Int2 *) elem2);
    if (f.x[1] > s.x[1]) return 1;
    if (f.x[1] < s.x[1]) return -1;
    return 0;
}

int compInt3(const void *elem1, const void *elem2) {
    Int3 f = *((Int3 *) elem1);
    Int3 s = *((Int3 *) elem2);
    if (f.x[2] > s.x[2]) return 1;
    if (f.x[2] < s.x[2]) return -1;
    return 0;
}

int main() {
    
    int y[6] = {2,6,7,5,4,3};
    
    qsort(y, 2, 3 * sizeof(int), compInt1);
    
    for (int i = 0; i < 6; i++)
        cout << y[i] << "  ";
    cout << endl;
    
    return 0;
}