Question

Create a c++ program with this requirements:

1. Create an input file using notepad ( .txt ) . When testing your program using different input files, you must change the filename inside your program otherwise there will be syntax errors.
2. There are a finite number of lines to be read from the data file. But we can’t assume to know how many before the program executes; so, the standard tactic is to keep reading until you find the “End of File” marker.
3. Input date file consists of scores (one per line), might contain no score at all (an empty file) and program does not know how many scores before execution.
4. If file not empty, determine how many valid scores (0 to 100), and how many invalid scores (less than 0 or greater than 100).
5. Take only the valid scores and determine what letter grade and keep track of how many As, Bs, Cs, Ds, and Fs.  

(90 to 100 is an A, 80 to 89 is a B, 70 to 79 is a C, 60 to 69 is a D, 0 to 60 is a F)

6. Output to the screen (not file output) with the followings: the number of valid scores, the number of invalid scores, the highest valid score, the lowest valid score, and the average of the valid scores. Also print out the histogram of the grades (sideway). Look at my output examples
7. If the file is empty, don’t print any statistics at all. If the input file only has invalid scores, just print how many invalid scores and no valid scores, don’t include any statistics.
8. Test your program with difference cases/scenarios.

It would just be based on this template:

#include<iostream>

#include<iomanip>

#include<fstream>

using namespace std;

int main ( )

{

int ValidScores=0, InvalidScores=0, numA=0, numB=0, numC=0, numD=0, numF=0;

double score, averageScore, highScore, lowScore;

ifstream In;

In.open( );

if ( )

{

cout << "Input file not found. Program ends" << endl;

return -1;

}

In >> score;

while ( )

{

}

if (ValidScores + InvalidScores) == 0)cout << "No data in the input file" << endl;

else if (ValidScores == 0) cout << InvalidScore << " invalid scores entered. No statistics" << endl;

else

{

}

return 0;

}

Answer 1

Here is the complete C++ code, I could not finish the histogram as the question does not show the output of the program and I could not figure out as how it needs to be displayed, could you please add that part, so that i can complete it. Rest all done.!

Thank you.

=======================================================================

#include<iostream>
#include<iomanip>
#include<fstream>

using namespace std;

int main ( )
  
   {
  
   int ValidScores=0, InvalidScores=0, numA=0, numB=0, numC=0, numD=0, numF=0;
  
   double score, averageScore, highScore, lowScore;
  
   ifstream In;
  
   In.open("scores.txt"); // update the input file name here
  
   if (In.bad() || !In.is_open() )
  
   {
  
   cout << "Input file not found. Program ends" << endl;
  
   return -1;
  
   }
  
   In >> score;
  
   while ( In)
   {
       if(score<0 || score>100) InvalidScores+=1;
       else if(score>=90) numA+=1;
       else if(score>=80) numB+=1;
       else if(score>=70) numC+=1;
       else if(score>=60) numD+=1;
       else numF+=1;
       if(score<=100 && score>=0){
           ValidScores+=1;
           averageScore += score;
           if(ValidScores==1) highScore=lowScore=score;
           if(highScore<score) highScore = score;
           if(lowScore>score) lowScore = score;      
       }
       In >> score;
  
   }
  
   In.close();
  
   if ((ValidScores + InvalidScores) == 0)cout << "No data in the input file" << endl;
   else if (ValidScores == 0) cout << InvalidScores << " invalid scores entered. No statistics" << endl;
   else   {
       cout<<"Total Invalid Scores: "<<InvalidScores<<endl;
       cout<<"Total valid Scores: "<<ValidScores<<endl;
      
       cout<<"Total A Scores: "<<numA<<endl;
       cout<<"Total B Scores: "<<numB<<endl;
       cout<<"Total C Scores: "<<numC<<endl;
       cout<<"Total D Scores: "<<numD<<endl;
       cout<<"Total F Scores: "<<numF<<endl;
      
       cout<<"Max Score: "<<highScore<<endl;
       cout<<"Low Score: "<<lowScore<<endl;
      
       cout<<setprecision(2)<<showpoint<<fixed;
       cout<<"Average Score: "<<averageScore/ValidScores<<endl;
  
   }
  
   return 0;

}

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