===== Prevod ciselnych soustav ======

<code C++>
#include <iostream>
using namespace std;

/*
void conv1 (int n)
{
    while (n > 0)
    {
        cout << n % 2;
        n = n / 2;
    }
}

void conv2 (int n)
{
    if (n > 0)
    {
        cout << n % 2;
        conv2 (n / 2);
    }
}

void conv3(int n)
{
    if (n > 0)
    {
        conv3(n / 2);
        cout << n % 2;
    }
}
*/

string conv (int n, int z = 2)
{
    string s = "";
    bool neg = false;
    if (n < 0) { n = -n; neg = true; }
    while (n > 0) 
    {
        int t = n % z; // cislice jako int
        char d; // cislice jako char

        if (t <= 9)
            d = '0' + t;
        else
            d = 'A' + t - 10 ;

        s = d + s;
        n = n / z;
    }
    if (s == "") { s = "0"; }
    if (neg) { s = '-' + s; }
    return s;
}

int main ()
{
    int n;
    // cout << "vlozte cislo : ";
    // cin >> n;
    n = 27;
    cout << "n = " << n << endl;
    cout << "ve dvojkove soustave " << conv(n) << endl;
    cout << "v osmickove soustave " << conv(n, 8) << endl;
    cout << "v desitkove soustave " << conv(n, 10) << endl;
    cout << "v sestnactkove soustave " << conv(n, 16) << endl;

    /*
    const int Max = 10;
    int c [Max];

    char znam = ' ';
    if (n < 0) 
    { 
         n = -n; 
         znam = '-'; 
    }

    int i = 0;
    while (n > 0 && i < Max)
    {
        c [i] = n % 2;
        n = n / 2;
        i = i + 1; 
    }
    // c[0] ... c[i-1]

    cout << "ve dvojkove soustave ";

    if (n != 0) cout << "overflow ";

    cout << znam;

    if (i == 0)
        cout << "0";

    while (i >= 1)
    {
        i = i - 1; 
        cout << c[i];
    }
    cout << endl;
    */

    /*
    int v = 1;
    while (n > 0)
    {
        cout << "cislice " << n % 2 << " ... " << v << endl;
        // n = n / 2;
        n /= 2;
        // v = 2 * v;
        v *= 2;
    }
    */
}
</code>

====== Jednorozměrná pole ======

<code C++>
#include <iostream>

using namespace std;

void add (double* z, double* x, double* y , int n) // z := x + y, n ... length
{
    for (int i = 0; i < n; i++)
        z[i] = x[i] + y[i];
}

void print(double* p, int n) // z := x + y
{
    for (int i = 0; i < n; i++)
        cout << i << " ... " << p[i] << endl;
}

void print2 (double* p, int n) // z := x + y
{
    cout << "[ ";
    for (int i = 0; i < n; i++)
    {
        cout << p[i];
        if (i < n - 1) cout << ", ";
    }
    cout << " ]" << endl;
}

int main()
{
    int n = 10;
    double* a, * b, * c;

    a = new double [n];
    b = new double [n];
    c = new double [n];

    for (int i = 0; i < n; i++)
    {
        a[i] = i + 1;
        b[i] = 10.1 * (i + 1);
    }

    add (c, a, b, n); // c = a + b

    print2 (c, n);

    delete a;
    delete b;
    delete c;

    cout << "O.K.\n";
}
</code>