Präsenz2

#include<iostream>
using namespace std;

int max(int a, int b){
  return -min(-a,-b);
}

int min(int a, int b){
  if(a<b) return a;
  return b;
}

bool repr_letter(int in){
  return (in <= 122 && in >=97 || in <= 90 && in >= 65);
}

void sort(int* in){//simpler Sortieralgorithmus, ausreichend für ein Array mit Länge 3
  int i=0;
  int *intermed;
  bool change=true;
  while(change){
    change=false;
    i=0;
    while(i< 3-1){
      if(*(in+i) > *(in+i+1)){
        *intermed=*(in+i+1);
        *(in+i+1)=*(in+i);
        *(in+i)=*intermed;
        change=true;
      }
      i++;
    }

  }
}

int rechne(int x,int y, int z){
  int arr[3]={x,y,z};
  sort(arr);
  cout << (*arr * *(arr+2) + *(arr+1));
  return 0;

}

bool gerade(int in){
  return (in%2==0);
}

void Aufgabe1(){
  char in;
  cout << "Ueberpruefe auf Vokal/Konsonant:";
  cin >> in;
  if(repr_letter(in)){
    if(in == 'a' || in == 'e' || in == 'i' || in == 'o' || in == 'u' || in == 'A' || in == 'E' || in == 'I' || in == 'O' || in == 'U' ){
      cout << "Vokal" << endl;
    }else cout << "Konsonant" << endl;
  }
  else cout << "Kein Buchstabe" << endl;
}

void Aufgabe2(){
  char x,y,z;
  cout << "letter 1=";
  cin >> x;
  cout << "letter 2=";
  cin >> y;
  cout << "letter 3=";
  cin >> z;

  if(x < y){
    if(z < x){
      cout << z << "," << x << "," << y  << endl; // z<x,x<y -> z<y
    }
    else{
      if(z<y){
        cout << x << "," << z << ","<< y  << endl;
      }
      else cout << x << "," << y << "," <<  z  << endl;

    }
  }else{
    if(z > x){
      cout << y << "," << x << ","<<  z  << endl; // z>x, x>y -> z>y
    }
    else{
      if(z>y){
        cout << y << "," << z << "," <<x  << endl;
      }
      else cout << z << "," << y << "," << x  << endl;

    }
  }



}

void Aufgabe3(){
  int testgerade;
  cout << "Gebe Integer zum Testen ein:";
  cin >> testgerade;
  if(gerade(testgerade)) cout << "Zahl ist gerade." << endl;
  else cout << "Zahl ist ungerade." << endl;
}

void Aufgabe4(){
  cout << min(-42,42) << endl;
}

void Aufgabe5(){
  rechne(1,3,-2);
}

int main(){


  /*Aufgabe1();
  Aufgabe2();*/
  Aufgabe3();
  Aufgabe4();
  Aufgabe5();

  return 0;
}