String compare error handling

I am working on a project and I have no idea how to handle a string compare result of 1. The program opens a data file and reads a quiz file. The first line is the key which is loaded into an array. The second line has 15 T/F answer followed by the students name. After reading the file, I am using a string compare to compare teh answers to the. If everything is correct it returns a value of 0.

The problem is how to handle a string the does not match and returns a value of one. When this value is returned, I want to compare the two strings element by element to find out whhcih one is wrong. ANy help would be greatly appreciated.

#include <fstream>
#include <iostream>
#include <string.h>

int main()
{
     using namespace std;

// Initialization
     char key[16];
     char answer[16];
     char firstname[5];
     char lastname[6];
     int result;
     
     ifstream inData;

     inData.open("c:quiz.dat");

     if (!inData)
          {
               cout << "File was not found." << endl;
               return 1;
          }

     inData >> key;

    while(!inData.eof())
    {
    int correct=0;
     int wrong=0;

     // Process data on file into array
     inData >> answer >> firstname >> lastname;

     // Results of processing
     result = strcmp(key,answer);
     
     if (result==0)
     {
          correct=strlen(answer);
          cout << firstname << lastname << correct << wrong <<"\n";
     }
     else
     {
// Not sure what to do here!!
          cout << firstname << lastname << correct << wrong <<"\n";
     }
}
return 0;    
}


//*********   DATA FILE   *******
TFTFTFTFTTTFFFT
TFTFTFTFTTTFFFT Jim John
TFTFTFTFTTTFFFF Jerry Sanchez