Error reading in c program

#include 

#include 

typedef int Bool;

const Bool TRUE = 1;

const Bool FALSE = 0;

char printableBool (Bool i)

 {

  if (i==FALSE) 

    return 'F';

  else return 'T';

}

int main () 

{

  ifstream f1, f2, f3check;

  ofstream f3;

  f1.open("exam");

  if (!f1) 

{

    cout << "Cannot open file exam" << endl;

    return 1;

  }

  f2.open("key");

  if (!f2) 

{

    cout << "Cannot open file key" << endl;

    return 1;

  }

  f3check.open("result");

  if (f3check)

 {

    cout << "File result already exists" << endl;

    return 1;

  }

  f3.open("result");

  if (!f3) 

{

    cout << "Cannot open file result" << endl;

    return 1;

  }

  int runningSum;

  int ans, key, score;

  runningSum = 0;

  f1 >> ans;

  if (!f1)

 {

    cout << "Error reading from file exam" << endl;

    return 1;

  }

  f2 >> key; 

  if (!f1) 

{

    cout << "Error reading from file key" << endl;

    return 1;

  }

  if (ans == key)

 {

    runningSum = runningSum + 25;

    score = TRUE;

  }

  else score = FALSE;

  f3 << printableBool(score) << endl;

  if (!f3) 

{

    cout << "Error writing to file result" << endl;

    return 1;

  }

  f1 >> ans;

  if (!f1)

 {

    cout << "Error reading from file exam" << endl;

    return 1;

  }

  f2 >> key; 

  if (!f1) 

{

    cout << "Error reading from file key" << endl;

    return 1;

  }

  if (ans == key)

 {

    runningSum = runningSum + 25;

    score = TRUE;

  }

  else score = FALSE;

  f3 << printableBool(score) << endl;

  if (!f3) 

{

    cout << "Error writing to file result" << endl;

    return 1;

  }

  f1 >> ans;

  if (!f1)

 {

    cout << "Error reading from file exam" << endl;

    return 1;

  }

  f2 >> key; 

  if (!f1) 

{

    cout << "Error reading from file key" << endl;

    return 1;

  }

  if (ans == key) 

{

    runningSum = runningSum + 25;

    score = TRUE;

  }

  else score = FALSE;

  f3 << printableBool(score) << endl;

  if (!f3) 

{

    cout << "Error writing to file result" << endl;

    return 1;

  }

  f1 >> ans;

  if (!f1)

 {

    cout << "Error reading from file exam" << endl;

    return 1;

  }

  f2 >> key; 

  if (!f1) 

{

    cout << "Error reading from file key" << endl;

    return 1;

  }

  if (ans == key)

 {

    runningSum = runningSum + 25;

    score = TRUE;

  }

  else score = FALSE;

  f3 << printableBool(score) << endl;

  if (!f3)

 {

    cout << "Error writing to file result" << endl;

    return 1;

  }

  f3 << endl << runningSum << endl;  

}