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static int cmp(const void *a, const void *b)
{
    return strcmp((const char*) a, (const char*) b);
}

C++ (Qt)
static int cmp(const void *a, const void *b)
{
    char c1 = *(char *) a;
    char c2 = *(char *) b;
    if (c1 < c2) return -1;
    if (c1 > c2) return +1;
    return 0;
}

C++ (Qt)
qsort(&arr[0], 20, sizeof(char), cmp);
 

C++ (Qt)
#include <iostream>
#include <algorithm>
#include <random>
#include <iterator>
 
using namespace std;
 
int main()
{
    const int N = 20;
    char arr[N];
 
    std::mt19937 gen;
    std::uniform_int_distribution<int> dist(0, 100);
 
    std::generate(arr, arr+N, std::bind(dist, gen));
 
    std::cout << "before sorting:" << std::endl;
    std::copy(arr, arr+N, std::ostream_iterator<int>(std::cout, " "));
 
    std::cout << std::endl << "after sorting:" << std::endl;
 
    std::sort(arr, arr+N);
    std::copy(arr, arr+N, std::ostream_iterator<int>(std::cout, " "));
 
    return 0;
}
 

C++ (Qt)
#include <iostream>
#include <algorithm>
#include <random>
#include <iterator>
#include <vector>
 
using namespace std;
 
int main()
{
    const int N = 20;
    std::vector<char> arr(N);
 
    std::mt19937 gen;
    std::uniform_int_distribution<int> dist(0, 100);
 
    std::generate(arr.begin(), arr.end(), std::bind(dist, gen));
 
    std::cout << "before sorting:" << std::endl;
    std::copy(arr.begin(), arr.end(), std::ostream_iterator<int>(std::cout, " "));
 
    std::cout << std::endl << "after sorting:" << std::endl;
 
    std::sort(arr.begin(), arr.end(),[](char a, char b){return a<b;});
    std::copy(arr.begin(), arr.end(), std::ostream_iterator<int>(std::cout, " "));
 
    return 0;
}
 

C++ (Qt)
gen.seed(std::chrono::system_clock::to_time_t(std::chrono::system_clock::now()));

    std::copy(arr.begin(), arr.end(), std::ostream_iterator<int>(std::cout, " "));

C++ (Qt)
for (auto x : arr) {
   ...
}
 

C++ (Qt)
std::copy(arr.begin(), arr.end(), std::ostream_iterator<int>(std::cout, " "));

C++ (Qt)
for (size_t i = 0; i < arr.size(); ++i) 
 printf("%8d%s", arr[i], (i % 10) ? "," : "\n");
 

C++ (Qt)
os << string << '\n' << array << "аляхер маляхер" << some_value << endl;
 

C++ (Qt)
template <class Container>
class Table {
public:
    Table(const Container &container, int column, const char * tab = "\t")
        : _container(container), _col(column), _tab(tab) {}
 
    friend std::ostream& operator<<(std::ostream &os, const Table &t) {
        int i = 0;
        for (const auto & x : t._container) { (++i % t._col) ? os << x << t._tab : os << x << std::endl; }
        return os;
    }
private:
    const Container &_container;
    int _col;
    const char * _tab;
};
 
...
 
std::cout << Table<decltype(arr)>(arr, 10)  << Table<decltype(arr)>(arr, 3, "...") << endl;
 
std::ostringstream os;
os <<  Table<decltype(arr)>(arr, 10) << Table<decltype(arr)>(arr, 3, "...") << "Аляхер-маляхер" << endl;
 
std::ofstream out("example.txt");
out << Table<decltype(arr)>(arr, 10)  << Table<decltype(arr)>(arr, 4, "\t") << "Аляхер-маляхер" << endl;
 
// и т.д..
 

C++ (Qt)
std::cout << setprecision(6) << Table<decltype(arr)>(arr, 10) << std::endl;
 

C++ (Qt)
        for( int i = 0; i < arr.size(); ++i )
                cout << setw( 8 ) << arr[ i ] << ((i % 10)? ", " : "\n");