C
#include <stdio.h>
int main(void)
{
puts("Hallo Welt! \n");
}
C++
#include <iostream>
int main()
{
std::cout << "Hallo Welt! \n";
}
int i = 13;
int werte[] = {1,2,3};
int *ptr1 = &i;
int *ptr2 = ptr1;
int *ptr3 = werte;
ptr3 = NULL;
Person.h
#pragma once
class Person
{
public:
Person(void);
Person(string name, int alter);
~Person(void);
string getName();
void setName(string name);
int getAlter();
void setAlter(int alter);
private:
string _name;
int _alter;
};
Person.cpp
Person::Person(void)
{
}
Person::Person(string name, int alter)
{
_name = name;
_alter = alter;
}
string Person::getName()
{
return _name;
}
void Person::setName(string name)
{
_name = name;
}
int Person::getAlter()
{
return _alter;
}
void Person::setAlter(int alter)
{
_alter = alter;
}
Mitarbeiter.h
class Mitarbeiter : public Person
{
public:
Mitarbeiter(void);
~Mitarbeiter(void);
int getID();
void setID(int id);
private:
int _id;
};
Mitarbeiter.cpp
int Mitarbeiter::getID()
{
return _id;
}
void Mitarbeiter::setID(int id)
{
_id = id;
}
Example
#include <iostream>
#include <string>
#include <limits.h>
#include <time.h>
#include <cmath>
#include <Windows.h>
using namespace std;
enum fehlercodes
{
ERROR_LESEN = 101,
ERROR_SCHREIBEN = 102
};
struct datum
{
int tag;
int monat;
int jahr;
};
struct person
{
string name;
string vorname;
datum geburtsdatum;
string beruf;
};
struct vector
{
double x;
double y;
};
class Person
{
public:
Person(void);
Person(string name, int alter);
~Person(void);
string getName();
void setName(string name);
int getAlter();
void setAlter(int alter);
private:
string _name;
int _alter;
};
Person::Person(void)
{
}
Person::Person(string name, int alter)
{
_name = name;
_alter = alter;
}
string Person::getName()
{
return _name;
}
void Person::setName(string name)
{
_name = name;
}
int Person::getAlter()
{
return _alter;
}
void Person::setAlter(int alter)
{
_alter = alter;
}
class Mitarbeiter : public Person
{
public:
Mitarbeiter(void);
~Mitarbeiter(void);
int getID();
void setID(int id);
private:
int _id;
};
Mitarbeiter::Mitarbeiter(void)
{
}
int Mitarbeiter::getID()
{
return _id;
}
void Mitarbeiter::setID(int id)
{
_id = id;
}
void methodCounter()
{
static int counter = 0;
counter++;
cout << counter << endl;
}
void fehlermeldung(fehlercodes number)
{
switch(number)
{
case ERROR_LESEN: cout << endl << "Lesefehler!" << endl; break;
case ERROR_SCHREIBEN: cout << endl << "Schreibfehler!" << endl; break;
}
}
void sleep(unsigned int mseconds)
{
clock_t goal = mseconds + clock();
while (goal > clock());
}
void zins()
{
double betrag = 0;
double betrag_neu = 0;
double zins = 0;
double ertrag = 0;
int jahre = 0;
cin >> betrag;
cin >> zins;
cin >> jahre;
cout << "Jahr \t Zins \t\t Betr Alt \t Betr Neu \t Ertrag" << endl;
for (int i = 1; i<=jahre; i++)
{
betrag_neu = betrag * zins;
ertrag = betrag_neu - betrag;
printf("%d \t %7.2f \t %7.2f \t %7.2f \t %7.2f \n", i, zins, betrag, betrag_neu, ertrag);
betrag = betrag_neu;
}
}
double fakul(int number)
{
double result = 1;
for (int i = 1; i<=number; i++)
{
result *= i;
}
return result;
}
void zsp()
{
int input;
int max = 0;
int min = INT_MAX;
double ds = 0;
int summe = 0;
cout << "Zahl eingeben:"; cin >> input;
summe = summe + input;
if (input > max) max = input;
if (input < min) min = input;
cout << "Zahl eingeben:"; cin >> input;
summe = summe + input;
if (input > max) max = input;
if (input < min) min = input;
cout << "Zahl eingeben:"; cin >> input;
summe = summe + input;
if (input > max) max = input;
if (input < min) min = input;
cout << "Zahl eingeben:"; cin >> input;
summe = summe + input;
if (input > max) max = input;
if (input < min) min = input;
cout << "Zahl eingeben:"; cin >> input;
summe = summe + input;
if (input > max) max = input;
if (input < min) min = input;
ds = (double)summe/5;
cout << endl;
cout << "Max: " << max << endl;
cout << "Min: " << min << endl;
cout << "Summe: " << summe << endl;
cout << "Durchschnitt: " << ds << endl;
}
void help()
{
cout << "Datentypen:" << endl;
bool b = true;
cout << "bool: " << sizeof(b) << endl;
short s = SHRT_MAX;
cout << "short(" << sizeof(s) << "): " << s << endl;
s++;
cout << "short(" << sizeof(s) << "): " << s << endl;
int i = INT_MAX;
cout << "int(" << sizeof(i) << "): " << i << endl;
i++;
cout << "int(" << sizeof(i) << "): " << i << endl;
unsigned int ui = UINT_MAX;
cout << "int unsigned(" << sizeof(ui) << "): " << ui << endl;
ui++;
cout << "int unsigned(" << sizeof(ui) << "): " << ui << endl;
long l = LONG_MAX;
cout << "long(" << sizeof(l) << "): " << l << endl;
l++;
cout << "long(" << sizeof(l) << "): " << l << endl;
float f = FLT_MAX;
cout << "float(" << sizeof(f) << "): " << f << endl;
f++;
cout << "float(" << sizeof(f) << "): " << f << endl;
double d = DBL_MAX;
cout << "double(" << sizeof(d) << "): " << d << endl;
d++;
cout << "double(" << sizeof(d) << "): " << d << endl;
char c = 'c';
cout << "char(" << sizeof(c) << "): " << c << endl;
}
unsigned int* arrayExpand(unsigned int oldarray[], unsigned int oldarrayc, unsigned int newsize)
{
unsigned int *newarray = new unsigned int[newsize];
for(unsigned int i = 0; i<=oldarrayc; i++)
{
newarray[i] = oldarray[i];
}
delete oldarray;
return newarray;
}
void dateilisting(int ebene, HANDLE fHandle, WIN32_FIND_DATA wfd)
{
do
{
// Eintrag nur behandeln, wenn es nicht . oder .. ist (werden nur bei Unterverzeichnissen mit zurückgeliefert)
// hier könnte man z.B. auch mit lstrcmp auf . und .. vergleichen, was allerdings nicht ganz so effizient ist
if (!( (wfd.cFileName[0]=='.') && ( (wfd.cFileName[1]=='.' && wfd.cFileName[2]==0) || wfd.cFileName[1]==0 ) ))
{
if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
dateilisting(1, fHandle, wfd);
// Datei ist keine, sondern ein Verzeichnis...
// Hier könnte man dasselbe nochmal machen, um auch die
// Unterverzeichnisse zu scannen ;-)
}
else
{
for (int i=0; i<ebene; i++) cout << " ";
for (int i=0; i<100; i++) cout << wfd.cFileName[i];
// cout << wfd.cFileName << endl;
}
}
}
while (FindNextFile(fHandle,&wfd));
FindClose(fHandle);
}
int main()
{
bool running = true;
bool promptTime = true;
string command = "";
static int commandCounter = 0;
do
{
if (promptTime)
{
time_t ts;
tm *now;
ts = time(0);
now = localtime(&ts);
cout << now->tm_year+1900 << '.' << now->tm_mon+1 << '.'
<< now->tm_mday << "-" << now->tm_hour
<< ':' << now->tm_min << ":" << now->tm_sec << " " << clock() << " " ;
}
commandCounter++;
cout << "input " << commandCounter << " =>";
cin >> command;
if (command == "klassen")
{
Person* p = new Person();
p->setName("Rene");
p->setAlter(30);
cout << "Person " << p->getName() << ", " << p->getAlter() << endl;
Mitarbeiter* m = new Mitarbeiter();
m->setID(1);
m->setName("Rene");
m->setAlter(30);
cout << "Mitarbeiter " << m->getID() << ", " << m->getName() << ", " << m->getAlter() << endl;
}
if (command == "files")
{
cout << "Geht leider nicht. Lieber nach einer POSIX-Lösung suchen!" << endl;
//HANDLE fHandle;
//WIN32_FIND_DATA wfd;
//fHandle=FindFirstFile((LPCWSTR)"C:\\*",&wfd);
//dateilisting(0, fHandle, wfd);
}
if (command == "zeiger")
{
int i = 13;
int werte[] = {1,2,3};
int *ptr1 = &i;
int *ptr2 = ptr1;
int *ptr3 = werte;
cout << *ptr1 << " " << *ptr2 << " " << *ptr3 << " " << *(ptr3+1) << " " << *(ptr3+2) << endl;
ptr1 = NULL;
cout << " " << *ptr2 << " " << *ptr3 << " " << *(ptr3+1) << " " << *(ptr3+2) << endl;
*ptr2 = 7;
cout << i << " " << *ptr2 << " " << *ptr3 << " " << *(ptr3+1) << " " << *(ptr3+2) << endl;
}
if (command == "vector")
{
vector v[2];
for (int i = 0; i<2; i++)
{
cout << endl;
cout << i+1 << ".Vektor" << endl;
cout << " x: "; cin >> v[i].x;
cout << " y: "; cin >> v[i].y;
cout << endl;
}
double l1, l2;
l1 = sqrt(pow(v[0].x,2) + pow(v[0].y,2));
l2 = sqrt(pow(v[1].x,2) + pow(v[1].y,2));
if (l1 == l2)
{
cout << "L1 = L2" << endl;
}
else
if (l1 > l2)
{
cout << "L1 > L2" << endl;
}
else
if (l1 < l2)
{
cout << "L1 < L2" << endl;
}
}
if (command == "struct")
{
datum birthday;
person rene;
cin >> birthday.tag;
cin >> birthday.monat;
cin >> birthday.jahr;
cin >> rene.vorname;
cin >> rene.name;
cin >> rene.beruf;
rene.geburtsdatum = birthday;
cout << endl;
cout << rene.vorname << " " << rene.name << " " << rene.geburtsdatum.tag << "." << rene.geburtsdatum.monat << "." << rene.geburtsdatum.jahr << " " << rene.beruf << endl;
cout << endl;
}
if (command == "tabelle")
{
int tab[10][10];
for (int i=0; i<10; i++)
for (int j=0; j<10; j++)
tab[i][j]=(i+1)*(j+1);
for (int i=0; i<10; i++)
for (int j=0; j<10; j++)
printf("%d\t",tab[i][j]);
}
if (command == "kerker")
{
bool doors[100];
memset(doors, false, sizeof(doors));
for(int x = 0; x<100; x++) cout << doors[x] << " ";
for(int i = 0; i<100; i++)
{
for(int j = i; j<100; j+=(i+1))
{
doors[j] = !doors[j];
}
for(int x = 0; x<100; x++) cout << doors[x] << " ";
cout << endl << endl;
}
for(int x = 0; x<100; x++) if(doors[x]) cout << x+1 << " ";
cout << endl;
}
if (command == "prim")
{
//time_t ts;
//tm *now;
//ts = time(0);
//now = localtime(&ts);
unsigned int primesCount = 0;
unsigned int primesMax = 100;
unsigned int *primes = new unsigned int[100];
unsigned int end = 0;
cin >> end;
//int end_hour = 0;
//int end_min = 0;
//unsigned int i = 1;
//cin >> end_hour;
//cin >> end_min;
int time_start = clock();
//while ( now->tm_hour <= end_hour && now->tm_min < end_min && i < INT_MAX )
for (unsigned int i = 1; i<=end; i+=2)
{
//cout << (now->tm_hour <= end_hour) << " " << (now->tm_min < end_min) << " " << i << endl;
bool prim = true;
//int time_before = clock();
for (unsigned int j=1; j<primesCount; j++)
{
if( (i%primes[j])==0 ) prim = false;
}
if (prim)
{
//cout << "Zeit: " << (clock()-time_before) << ", Zahl: " << i << endl;
if(primesCount>=primesMax) primes = arrayExpand(primes, primesCount, primesCount+100);
primes[primesCount++] = i;
}
//i+=2;
}
cout << endl;
cout << "Zeit: " << clock()-time_start << endl;
cout << "Anzahl gefundener Primzahlen: " << primesCount << endl;
cout << "Größte gefundene Primzahl: " << primes[primesCount-1] << endl;
}
if (command == "test")
{
const int array_length = 10;
int zahlen[array_length];
for (int i = 0; i<array_length; i++)
{
// zahlen[i] = i;
for(int j=63;j>=0;--j) printf("%d",((zahlen[i]>>j)&1));
cout << endl;
int fubar = 12;
for(int j=63;j>=0;--j) printf("%d",((fubar>>j)&1));
cout << endl;
}
}
if (command == "count")
{
methodCounter();
}
if (command == "zins")
{
zins();
}
if (command == "fibo")
{
int end = 0;
int result = 0;
int last1 = 1;
int last2 = 0;
cin >> end;
while(result < end)
{
result = last1 + last2;
last2 = last1;
last1 = result;
cout << result << endl;
}
}
if (command == "fak")
{
int number = 0;
cin >> number;
cout << number << "!=" << fakul(number) << endl;
}
if (command == "sort")
{
int a = 0;
int b = 0;
int c = 0;
int tmp = 0;
cin >> a;
cin >> b;
cin >> c;
if (a>b) {tmp=b;b=a;a=tmp;}
if (a>c) {tmp=c;c=a;a=tmp;}
if (b>c) {tmp=c;c=b;b=tmp;}
cout << a << ", " << b << ", " << c << endl;
}
if (command == "zsp")
{
zsp();
}
if (command == "kill")
{
string name = "";
cin >> name;
sleep(1000);
cout << "PENG!" << endl;
sleep(1000);
cout << "PENG!" << endl;
sleep(1000);
cout << "argh! (and argv and argc too ...)" << endl;
sleep(1000);
cout << name << " ist tot ..." << endl;
}
if (command == "setTimePrompt")
{
string in = "";
cin >> in;
if (in == "true") promptTime = true;
if (in == "false") promptTime = false;
}
if (command == "help") help();
if (command == "exit")
{
running = false;
cout << "exiting with " << commandCounter << " commands executed." << endl;
}
if (command == "fun")
{
cout << "format c: ";
for (int i = 0; i<20; i++)
{
cout << "=";
sleep(1000);
}
fehlermeldung(ERROR_SCHREIBEN);
cout << "> finished." << endl;
}
} while(running);
}
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