Question

nothing happens when I replace the skeleton code. the program runs but it does not give me the desired results. All the question marks must be removed and filled in with the appropriate code.

// Function prototypes
void displayAllLines(ifstream &infile);
void displayLastLine(ifstream &infile);

int main()
{
// Arrays for file names

char fileName1[SIZE];
char fileName2[SIZE];

// File stream objects
ifstream jokeFile;
ifstream punchlineFile;

// Explain the program to the user.
cout << "This program will print a joke "
<< "and its punch line.\n\n";

// Get the joke file name.
cout << "Enter the name of the file holding "
<< "the joke (joke.txt): ";
"????";

// Get the punch line file name.
cout << "Enter the name of the file holding "
<< "the punch line (punchline.txt): ";
"????";

// Open the joke file.
"????";

// Test for errors.
if ("????")
{
cout << "The file " << fileName1
<< " could not be opened.";
exit(0);
}

// Open the punch line file.
"????";

// Test for errors.
if ("????")
{
cout << "The file " << fileName2
<< " could not be opened.";
exit(0);
}

cout << endl << endl;

// Call displayAllLines to display the
// contents of the joke file.
"????";

// Call displayLastLine to display the
// last line in the punch line file.
"????";
cout << endl;

// Close the files.
jokeFile.close();
punchlineFile.close();

return 0;
}

//**************************************************
// The displayAllLines function reads and displays *
// all lines in the text file whose ifstream *
// variable is passed to the function. *
//**************************************************

void displayAllLines(ifstream &infile)
{
char "????"; // To hold a line

// Just to make sure we are at the beginning
// of the file, seek to the beginning and clear
// any error bits.
infile.seekg(0, ios::beg);
infile.clear();

// Read the first line.
"????"(line, SIZE, '\n' );

while (!infile.eof())
{
// Display the line.
cout << line << endl;

// Read the next line.
"????";
}
}

//***************************************************
// The displayLastLine displays the final line in *
// a file. It finds it by going to the end of the *
// file and then backing up a character at a time *
// until it reaches the beginning of the last line. *
//***************************************************

void displayLastLine(ifstream "????")
{
char ch; // To hold a character
char line[SIZE]; // To hold a line
bool foundLastLine = false; // Flag

// Find the beginning of the last line
// Clear the eof bit just in case we're
// already at end of the file.
infile.clear();

// Go to the end of the file.
infile.seekg(0, ios::end);

// Move backwards to beginning of the
// final char in the file and read it in
"????"(-1, ios::cur);
"????" = infile.get();

// Back up until we find a newline.
while (infile && !foundLastLine)
{
// If the char just read is NOT a newline...
if (ch != '\n')
{
// Back up two more characters (one
// to skip the char just read and one
// more to move just before the previous
// char so we can read it next.
infile.seekg("????");
ch = infile.get();
}
else
{
// We found the newline at the end of the
// next to last line, so we are where we
// want to be. The next char begins the
// final line.
foundLastLine = true;
}
}

// Read final line and display it
infile.getline(line, SIZE, '\n');
cout << line;
}