While in C Program

#include 

#include 

int exp (int,int);

void readnums (int&, int&);

void main ()

 {

  int b, e;

  readnums(b,e);

  cout << b << " to the " << e << " = " << exp(b,e) << endl;

}

void readnums (int& b, int& e) 

{

  int correctInput;

  cout << "Enter the base and the exponent: ";

  cin >> b >> e;

  if (!cin) 

{ 

    cout << "Disaster! Terminating program." << endl;

    exit(-1);

  }

  correctInput = (b >= 0) && (e >= 0);

  while (!correctInput)

 {

    cout << "Something wrong! Try again ..." << endl;

    cout << "Re-enter base and exponent: ";

    cin >> b >> e;

    if (!cin) 

{ 

      cout << "Disaster! Terminating program." << endl;

      exit(-1);

    }

    correctInput = (b >= 0) && (e >= 0);

  }

}

int exp (int b, int e) 

{

  int result;

  result = 1;

  while (e != 0) 

{

    result = result * b;

    e = e - 1;

  }

  return(result);

}