solutions.cpp

/* Main file
 *
 * Author: Miguel Gonzalez <m.gonzalez@student.fontys.nl>
 * Version: 1.0
 * Since: 1.0
 */

#include <string>
#include <iostream>
#include <cstdlib>
#include <bitset>

using namespace std;

// Declarations for assignments
void assignment1_1() {  
    cout << "Miguel Gonzalez, Einsteinstrasse 5" << endl;
}

// Declarations
int readYear(string title) {
    
    char yearSequence[4];
    
    cout << title;
    cin >> yearSequence;    
    
    return atoi(yearSequence);
}

void assignment1_2() {
    int age = readYear("Current year: ") - readYear("Year of birth: ");
    cout << "Congratulations! Your current age is " << age << endl;
}

void assignment1_3() {
    
    string line1, line2;
    
    cout << "Line 1: " << flush;
    cin >> line1;
    cout << "Line 2: " << flush;
    cin >> line2;
    
    cout << line1 << ", " << line2 << endl;    
}

void assignment1_4() {  
    
    char ch;
    cin >> ch;
    
    cout << ++ch << endl;
}

void assignment1_5() {  
    char ch;
    int i;
    ch = 'A';
    i = 123;
}

float miliToZoll(float mili) {
    return mili / 1000.0 * 39.37;
}

float zollToMili(float zoll) {
    return zoll / 39.37 * 1000;
}

void assignment1_6() {
    cout << zollToMili(39.37) << endl;
}

void assignment1_7() {  
    int number = 0;
    
    int n = 10;
    int *nPtr =&n;
    cout << *nPtr << endl;
    
    cin >> number;
    
    if (number > 0 && number <= 1000) {
        number = (number << 6) + (number << 5) + (number << 2);    
        cout << number << endl;
    } else {
        cout << "INVALID INPUT!" << endl;
    }
}

void assignment2_1()
{
    int value = 0;
    int biggest = 0;
    
    while (cin >> value && value >= 0)
    {
        biggest = (value > biggest) ? value : biggest;
    }
    
    cout << "Biggest number was " << biggest << endl;
}

void assignment2_2()
{
    double value;
    double average;
    double sum;
    int count;
    
    while (cin >> value && value >= 0.f)
    {
        ++count;
        sum += value;
        average = sum / count;
    }
    
    cout << "Average was " << average << endl;
}

void assignment2_3()
{
    int number = 0;
    cout << "Number: ";
    cin >> number;
    
    int lastNumber = number % 10;
    number = (number - lastNumber) / 10;
    int otherNumber = number % 10;
    
    cout << "Sum of last 2 digits: " << (otherNumber + lastNumber) << endl;    
}

void assignment2_4()
{
    int number = 0;
    int last = 0;
    int count = 20;
    int smallerCount = 0;
    
    while (count-- > 0)
    {
        cin >> number;        
        
        if (count < 19 && last > number)
        {
            ++smallerCount;
        }
        
        last = number;
    }
    
    cout << smallerCount << " numbers followed by smaller ones." << endl;
}

void assignment2_5()
{
    int count = 10;
    int smallest;
    int value = 0;
    
    while (count-- > 0)
    {
        cin >> value;
        
        if (count == 9)
        {
            smallest = value;
        }
        
        smallest = (value < smallest) ? value : smallest;
    }
    
    cout << "Smallest number is " << smallest << endl;
}

void assignment3_1() 
{
    string line, other;
    cout << "Word: ";
    cin >> line;
    int index = line.length() - 1;
    
    do 
    {
        other.push_back(line[index]);
    } while (index-- >= 0);
    
    cout << "Inverse: " << other;
}

void assignment3_2() 
{
    int number;
    int biggest = 0, count = 0;
    
    while (cin >> number)
    {
        if (number > biggest)
        {
            biggest = number;
            count = 1;
        } else if (number == biggest) 
        {
            ++count;
        }
    }
    
    cout << "Biggest was " << biggest << " and occurred " << count << " times" << endl;
}

int digitSum(int n)
{
    int result  = 0;
    
    while (n > 0)
    {
        result += n % 10;
        n /= 10;
    }
    
    return result;
}

void assignment4_2()
{
    cout << digitSum(12345) << endl;
}

unsigned long int datumcode(int jahr, int monat, int tag)
{
    unsigned long result = jahr << 4;
    
    result ^= monat;    
    result <<= 5;    
    result ^= tag;
    
    return result;
}

void assignment5_1() 
{
    bitset<16> bits(datumcode(21,6,17));
    cout << bits << endl;
}

unsigned char bcd(int n)
{
    char result;
    
    int lastNumber = n % 10;
    int secondNumber = ((n - lastNumber) / 10) % 10;
    
    result ^= (secondNumber << 4);
    result ^= lastNumber;
    
    return result;
}

void assignment5_2() 
{
    bitset<16> bits(bcd(12345));
    cout << bits << endl;
}

int komtVoor(int number, int arr[], int size)
{
    int count = 0;
    
    for (int i = 0; i < size; ++i)
    {
        (arr[i] == number) ? ++count : count;
    }
    
    return count;
}

void assignment5_5()
{
    int arr[] = {1,2,3,4,5,5,6,5,7};    
    cout << komtVoor(5, arr, 9);
}

int nOverK(int n, int k)
{
    // TODO
    return nOverK(n, k - 1) * (n - k + 1) / k;
}

void assignment5_6()
{
    cout << "Value: " << nOverK(10, 20) << endl;
}
    

int main(int argc, char** argv) {
    //assignment1_1();
    //assignment1_2();
    //assignment1_3();
    //assignment1_4();
    //assignment1_5();
    //assignment1_6();
    //assignment1_7();
    //assignment2_1();
    //assignment2_2();
    //assignment2_3();
    //assignment2_4();
    //assignment2_5();
    //assignment2_6();
    //assignment2_7();
    //assignment3_1();
    //assignment3_2();
    assignment4_2();
    //assignment5_1();
    //assignment5_2();
    //assignment5_6();
    return 0;
}