Mi a hiba ebben a c++ programban? (kezdő)

#include <iostream>

#include <fstream>

using namespace std;

int main()

{

float p;

p = 3.14;

float r;

int m;

float e;

ofstream a_file ("console.txt", ios::app);

std::cout<<"_______________________________________________________ \n";

std::cout<<"Ez a program a kor teruletet/keruletet szamitja ki. \n 1. kerulet szamitas \n 2. terulet szamitas \n 3. Korabbi eredmenyek\n";

std::cout<<"_______________________________________________________ \n";

std::cin>>m;

std::cout<<"_______________________________________________________ \n";

switch (m) {

case '1':

std::cout<<"A kerulet szamitast valasztottad. Add meg a kor atmerojet a keruletenek kiszamitasahoz. Majd nyomj entert. \n";

std::cout<<"_______________________________________________________ \n";

std::cin>>r;

std::cout<<"_______________________________________________________ \n";

e = 2*r*p;

std::cout<<"A vegeredmeny:" << e << '\n';

std::cout<<"_______________________________________________________ \n";

break;

case '2':

std::cout<< "A kor teruletenek kiszamitasat valasztottad. Add meg a kor atmerojet. Majd nyomj entert.";

std::cout<<"_______________________________________________________ \n";

std::cin>>r;

std::cout<<"_______________________________________________________ \n";

e = r*r*p;

std::cout<<"A vegeredmeny:" << e << '\n';

std::cout<<"_______________________________________________________ \n";

break;

case '3':

char asd[100];

ifstream b_file ("console.txt");

b_file>> asd;

cout<< asd;

break;

default:

std::cout<<"Hibasan adtad meg a szamot!";

a_file<<"HIBA !! ";

return;

}

a_file<<"sugar: " << r << " vegeredmeny: " << e << '\n';

std::cout<< '\n' << '\n'<< '\n' << "------------------------- \n";

std::cout<<"Kilepeshez nyomj entert!";

getchar();

getchar();

}