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C++ Exam Cheat Sheet by

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Datatyps

std::s­tring
int
float
etc.

Arrays and List

int ar[size]
int arLenght = sizeof(ar) / sizeof­(int);

Class Body File Paradigm // Compare Header

#include "Zaehlwerk.h"
Zaehlwerk::Zaehlwerk(int ma){
zahl = 0;
max = ma;
}
void Zaehlwerk::Inkrementieren(){
if (zahl < max)
zahl++;
}
std::string Zaehlwerk::Anzeigen(){
return "der Zaehler ist auf der "+std::to_string(zahl);
}

Extensions / CPP File

#include "Ringwerkzaehler.h"
Ringwerkzaehler::Ringwerkzaehler() :Zaehlwerk(){ }
Ringwerkzaehler::Ringwerkzaehler(int ma) : Zaehlwerk(ma){ }
void Ringwerkzaehler::Inkrementieren(){
if (zahl < max)
zahl++;
else
zahl = 0;
}

bubbleSort Algori­thmus

void bubblesort(int *array, int length){
     int j;
  for (j = 0; j < length - i - 1; ++j) {
  if (array[j] > array[j + 1]) {
  int tmp = array[j];
  array[j] = array[j + 1];
  array[j + 1] = tmp;
  }
     }
 }
 

Compare Classes

bool operator < (classobj) { return (cVar < obj.cVar); } //In Constr­uctor

Class header File Paradigm

class Zaehlwerk
{
protected:
int zahl;
int max;
public:
Zaehlwerk();
Zaehlwerk(int max);
~Zaehlwerk();
virtual void Inkrementieren();
virtual void Dekrementieren();
virtual std::string Anzeigen();
virtual void Zuruecksetzen();
private:

};

Extentions / Header File

class Ringwerkzaehler : Zaehlwerk
{
public:
Ringwerkzaehler();
Ringwerkzaehler(int ma);
~Ringwerkzaehler();
void Inkrementieren() override;
void Dekrementieren() override;
std::string Anzeigen() override;
void Zuruecksetzen() override;
};

Thread Operations

std::t­his­_th­rea­d::­sle­ep_­for­(st­d::­chr­ono­::s­eco­nds­(1));
 

String functions

printf­("%s­\n", text.c­_st­r());
std::s­tring s1('*', 20);
s1.app­end­(s2);
int equ = s1.com­pare(2, 4, s2);
s1.cle­ar();
s2.era­se(1, 3);
s1.fin­d_l­ast­_of­(s2);
s.inse­rt(2, " einString ", 0, 3);
s.leng­th();
s.repl­ace(2, 5, "­ano­Str­ing­", 2,2);
std::s­tring s3=s1.s­ub­str­(2,3);

Data processing / Read file / char

std::ifstream f;
f.open(fileName, std::ios_base::out);

int counter = 0;
char t;

while (f.get(t))
if (t == c)
counter++;

f.close();

Struct Example

struct kontakt{
std::string name;
int nummer;

std::string toString() {
std::string temp = name + " ";
temp += std::to_string(nummer);
return temp;
}
};
 

Data processing / Write file

std::ofstream f;
f.open(fileName, std::ios_base::out);

std::string temp = "";

temp = "joe ";
temp += std::to_string(120);

f << temp << std::endl;
f.close();

Data processing / Read file / getLine

std::vector<kontakt> kontaktListe(readFile(filename));
std::ifstream f;
f.open(fileName, std::ios_base::out);
std::string t="";
int i = 0;
while (getline(f, t))
{
for each (char var in t)
{
if (var == ' ')
{
//Operation
}
else
i++;
}
i = 0;
}

f.close();

Debugger / cout shorter

//Debug Messanger
#define DEBUG 1
#if DEBUG
#define LOG(x) std::cout << x << std::endl
#else
#define LOG(x)
#endif

system("PAUSE"); // Just here to remember

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