Answer to Question #210010 in C++ for ASAP

Question

Topic: Files and Streams

Codes discussed will be posted here. Write your conclusion

Filename: "Ch5_stData.txt"

Given problem:

Steve Gill 89
Rita Johnson 91.5
Randy Brown 85.5
Seema Arora 76.5
Samir Mann 73
Samantha McCoy 88.5

*Note: Need the proper codes

*Note need proper codes and conclusion on how its done and about the results. And please give the proper solution and explanation.

Answer 1

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

using namespace std;

int main()
{
    string firstName;
    string lastName;
    double testScore;
    char grade = ' ';
    double sum = 0;
    int count = 0;
    
    ifstream inFile;
    ofstream outFile;
    
    inFile.open("Ch5_stData.txt");
    if (!inFile) {
        cout << "Cannot open input file. "
             << "Program terminates!" << endl;
        return 1;
    }
    
    outFile.open("Ch5_stData.out");
    
    outFile << fixed << showpoint << setprecision(2);
    
    inFile >> firstName >> lastName;
    inFile >> testScore;
    
    while (inFile) 
    {
        sum = sum + testScore;
        count++;

        switch (static_cast<int> (testScore) / 10) {
            case 0:
            case 1:
            case 2:
            case 3:
            case 4:
            case 5:
                grade = 'F';
                break;
                
            case 6:
                grade = 'D';
                break;
                
            case 7:
                grade = 'C';
                break;
                
            case 8:
                grade = 'B';
                break;
                
            case 9:
            case 10:
                grade = 'B';
                break;
                
            default:
                cout << "Invalid score." << endl;
        }
        outFile << left << setw(12) << firstName
                << setw(12) << lastName
                << right << setw(4) << testScore
                << setw(2) << grade << endl;
        
        inFile >> firstName >> lastName;
        inFile >> testScore;
    }
    
    outFile << endl;
    
    if (count != 0)
        outFile << "Class Average: " << sum / count << endl;
    else
        outFile << "No data." << endl;
    
    inFile.close();
    outFile.close();
    
    return 0;
}