Prac 0

// A program to display "Hello World."
#include <iostream>
using namespace std;

int main() {
    cout << "Hello World. \n";
}

Prac 0-3

// A program to display "Hello World."
#include <iostream>
using namespace std;

int main() {
    int x;     // variable to store read integer number

    cout << "Type an integer number: ";  // ask a user to type an integer number
    cin >> x;                            // read the typed number and store it in the variable x.
    
    cout << "You typed : " << x << endl;
}

Prac 0-4

// A program to display "Hello World."
#include <iostream>
using namespace std;

int main() {
    int x;     // variable to store read integer number

    cout << "Type an integer number: ";  // ask a user to type an integer number
    cin >> x;                            // read the typed number and store it in the variable x.
    int absx = x;                        // store absolute value of x
    if (x < 0) {
        absx = -x;
    }
    
    cout << "The absolute value of the number you typed is : " << absx << endl;
}

Prac 1

// compute an average of elements from two arrays
#include <iostream>

int main() {
    int narray1[]={16,22,38,46,51,69,70,88,95,102};
    int narray2[]={13,29,33,45,57,62,75,84,91,105};
    int size = sizeof narray1 / sizeof(int);

    for (int i = 0; i < size; i++) {
        std::cout << "The average of "
             << "narray1[" << i << "] and narray2[" << i << "]: "
             << (narray1[i] + narray2[i]) / 2 << std::endl;
    }
    return 0;
}

Prac 2

/* find max and min value of three arrays */
#include <iostream>
// using directive
using namespace std;

int main() {
    double narray1[] = { 16.21, 22.50, 38.33, 46.00, 51.71,
        69.09, 70.89, 88.05, 95.77, 102.01 };
    double narray2[] = { 13.44, 29.78, 33.45, 45.03, 57.66,
        62.07, 75.66, 84.00, 91.82, 106.00 };
    double narray3[] = { 10.05, 29.44, 34.35, 43.56, 55.25,
        69.44, 72.00, 89.80, 97.45, 105.02 };
    int size = sizeof narray1 / sizeof(double), i;

    cout << showpoint;
    // find the max
    for (i = 0; i < size; i++) {
        cout << "The max value of "
             << narray1[i] << ',' << narray2[i] << ',' << narray3[i] << " : "
             << ((narray1[i] > narray2[i] ? narray1[i]:narray2[i]) >
                (narray2[i] > narray3[i] ? narray2[i]:narray3[i]) ?
                (narray1[i] > narray2[i] ? narray1[i]:narray2[i]):
                (narray2[i] > narray3[i] ? narray2[i]:narray3[i]))
             << endl;
    }

    cout << noshowpoint;
    // find the min
    for (i = 0; i < size; i++) {
        cout << "The min value of "
             << narray1[i] << ',' << narray2[i] << ',' << narray3[i] << " : "
             << ((narray1[i] < narray2[i] ? narray1[i]:narray2[i]) <
                (narray2[i] < narray3[i] ? narray2[i]:narray3[i]) ?
                (narray1[i] < narray2[i] ? narray1[i]:narray2[i]):
                (narray2[i] < narray3[i] ? narray2[i]:narray3[i]))
             << endl;
    }

    return 0;
}

Prac 3

/* reverse pointers */
#include <iostream>

// declare a const visible only within this file
namespace {
    const int size = 10;
}

int main() {
    int narray[] = { 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 };
    int *pnarray[size], i, j;

    for (i = 0, j = size - 1; i < size; i++, j--)
        pnarray[j] = &narray[i];

    for (j = 0; j < size; j++)
        std::cout << "pnarray[" << j << "] is : "
                  << *pnarray[j] << std::endl;

    return 0;
}