Write a C++ program that will display the following menu and work accordingly.
A menu which contains functionionality that will allow the following choices:
- Enter the name of the file that contains students enrolled in the computer course.
- Calculate and display the average and the letter grade for each student to the screen.
- Sort data from highest to lowest grade.
- Screen display of the sorted data.
- Search for a student record by last name and display "Exam Average" and "Letter Grade" .
- Write the sorted data to “result.txt” file.
7. Exit.
Sample Output RUN (not a complete example. Menu should be redisplayed after each selection):
Enter 1-7 to select one of the following choices:
- Enter the student data file name.
- Display the average and the letter grade for each student.
- Sort data from highest to lowest grade.
- Display the sorted data.
- Search for a student record by last name.
- Write the sorted data to the “result.txt” file.
- Exit.
>> 1
Enter the file name>> studInfo.txt
>> 2
>> 3
>> 4
First name Last Name Exams Average Letter Grade
---------- --------- ------------- ------------
Student one 92 A
Student two 80 B
Student three 70 C
7
>> Bye!
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;
const int NUM_EXAMS = 3;
const int NUM_STUDENTS = 6;
struct StuData
{
string lastName;
float exam[NUM_EXAMS], average;
int ID;
char letterGrade;
};
void programDescription();
void letterGrade(StuData[]);
void calcAverage(StuData[]);
void displayData(StuData[]);
void readStuData(ifstream&, StuData[]);
void writeStuData(ofstream&, StuData[]);
void sortAscending(StuData Exams[]);
int main()
{
int choice;
string lastName;
string fileName;
float examGrade;
ofstream outFile;
ifstream inFile;
StuData Exams[NUM_STUDENTS];
programDescription();
do
{
cout << "Option to choose from\n\n"<<endl;
cout << "Enter 1 to input the student data by file "<<endl;
cout << "Enter 2 to input the student data by keyboard "<<endl;
cout << "Enter 3 to sort the data by highest to lowest grade "<<endl;
cout << "Enter 4 to display the student data "<<endl;
cout << "Enter 5 to search for a students'name "<<endl;
cout << "Enter 6 to write the data to a text file called result.txt "<<endl;
cout << "Enter 7 to display the sorted data "<<endl;
cout << "Enter 8 to exit"<<endl;
cin >> choice;
if(choice == 1)
{
cout << "Enter the file name"<<endl;
cin >> fileName;
inFile.open(fileName.c_str());
if(inFile.fail())
{
cout<<" error"<<endl;
exit(1);
}
readStuData(inFile,Exams);
}
else if(choice == 2)
{
cout <<endl;
for(int i =0; i < NUM_STUDENTS; i++)
{
cout<<"Enter the students last name"<<endl;
cin >> Exams[i].lastName;
cout <<"Enter the students grade"<<endl;
for(int j =0; j < NUM_EXAMS; j++)
{
cin >> Exams[i].exam[j];
}
}
calcAverage(Exams);
}
else if(choice == 3)
{
sortAscending(Exams);
}
else if(choice == 4)
{
calcAverage(Exams);
}
else if(choice == 5)
{
cout<<"Enter the students that you're looking for"<<endl;
cin>> lastName;
int i =0;
bool found = false;
while ((!found)&&(i<=NUM_STUDENTS))
{
if(lastName == Exams[i].lastName)
{
found = true;
}
else
i++;
}
cout <<"Last Overall Letter"<<endl;
cout<< "Name Average Grade"<<endl;
cout << "----- ------- -----"<<endl;
cout << setw(10) << Exams[i].lastName << setw(10) << Exams[i].average <<setw(10) << Exams[i].letterGrade<<endl;
}
else if(choice == 6)
{
outFile.open("result.txt");
if(outFile.fail())
{
cout<<"Error"<<endl;
exit(1);
}
writeStuData(outFile, Exams);
outFile.close();
}
else if(choice == 7)
{
displayData(Exams);
}
else if (choice == 8)
{
cout<<"Finish"<<endl;
}
else
{
cout << "Invaid number entered"<<endl;
}
}while((choice >= 1) && (choice < 8));
inFile.close();
return 0;
}
void programDescription()
{
cout << "This program is going to display you a list of options which yout will have to" <<endl;
cout <<"sort and diplay student grade" <<endl;
cout <<"calculate the averge and search by lastname."<<endl;
}
void letterGrade(StuData Exams[])
{
for(int i=0; i <NUM_STUDENTS; i++)
{
if(Exams[i].average >= 90)
Exams[i].letterGrade = 'A';
else if(Exams[i].average >= 80)
Exams[i].letterGrade = 'B';
else if(Exams[i].average >= 70)
Exams[i].letterGrade = 'C';
else if(Exams[i].average >= 60)
Exams[i].letterGrade = 'D';
else
Exams[i].letterGrade = 'F';
}
}
void calcAverage(StuData Exams[])
{
for(int i =0; i <NUM_STUDENTS; i++)
{
for(int j=0; j<NUM_EXAMS;j++)
{
Exams[i].average = ((Exams[i].exam[j] + Exams[i].exam[j] + Exams[i].exam[j])/3);
}
}
letterGrade(Exams);
displayData(Exams);
}
void sortAscending(StuData Exams[])
{
StuData temp;
for(int i = 0; i < NUM_STUDENTS; i++)
for(int j = 0; j <NUM_STUDENTS; j++)
{
if(Exams[i].average< Exams[j].average)
{
temp = Exams[i];
Exams[i] = Exams[j];
Exams[j]= temp;
}
}
}
void displayData(StuData Exams[])
{
cout << endl << endl
<< "Last Exam Exam Exam Overall" << endl
<< "Name 1 2 3 Average Grade" << endl
<< "---- ---- ---- ---- ------- -----" << endl;
for (int i = 0; i < NUM_STUDENTS; i++)
{
cout << left << setw(15);
cout << Exams[i].lastName << setw(10) << Exams[i].exam[0] << setw(10)
<< Exams[i].exam[1] << setw(10) << Exams[i].exam[2];
cout << setw(10) << Exams[i].average << setw(10)
<< Exams[i].letterGrade << endl;
}
}
void readStuData(ifstream& inFile, StuData Exams[])
{
int i =0;
while(i < NUM_STUDENTS && inFile >> Exams[i].lastName)
{
inFile >> Exams[i].exam[0] >> Exams[i].exam[1] >> Exams[i].exam[2] >> Exams[i].letterGrade;
i++;
}
calcAverage(Exams);
letterGrade(Exams);
}
void writeStuData(ofstream& outFile, StuData Exams[])
{
for (int i = 0; i < NUM_STUDENTS; i++)
{
outFile << Exams[i].lastName;
outFile << setw(15) << Exams[i].average << setw(10);
outFile << Exams[i].letterGrade << endl;
}
}
