Can someone run this to see if its wrong.

[rduckett91]

I'm trying to get this this switch statement to run and its not doing anything it just keeps looping whatever I put in. It doesn't execute anything inside the switch statement

// Week 13: In Class Exercise - 5 Solution
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
using namespace std;

// Declared constants
const int NUM_EXAMS = 3;
const int NUMBER_STUDENTS = 6;

// Structure definition
struct StuData
{
	string firstName;
	string lastName;
	float ID;
	float exam[NUM_EXAMS];
	float avgGrade;
	char letterGrade;
};



// Function prototypes
void programDescription();
void getStuData(StuData[]);
void letterGrade(StuData[]);
void writeStuInfo(ofstream&, StuData[]);  
void readStuInfo(ifstream&, StuData[]);  
void calcGrades(StuData[]);
void displayStuInfo(const StuData[]);
float calcClassAverage(const StuData[]);
int main()
{
	// Program description
	programDescription();

	// Declare variables
	StuData stu1[NUMBER_STUDENTS];  
	ofstream outFile;
	ifstream inFile;
	char choice;
	string filename;

	// open file for output
	outFile.open("results.txt");
	if(outFile.fail())
	{
		cout << "Error opening file" << endl;
		exit(1);
	}
	do{


	// Process data as read and display in tabular format
	cout << "Enter 1-7 to select one of the following choices: " << endl;
	cout << "\t1. Enter the student data file name." << endl;
	cout << "\t2. Display the average and the letter grade for each student" << endl;
	cout << "\t3. Sort data from highest to lowest grade." << endl;
	cout << "\t4. Display the sorted data." << endl;
	cout << "\t5. Search for a student record by last name." << endl;
	cout << "\t6. Write the sorted data to the 'results.txt' file " << endl;
	cout << "\t7. EXIT." << endl;
	cin >> choice;

	switch (choice){
	case 1:
		cout << "\nEnter the file name: ";
		cin >> filename;
		// Opens file for input
		inFile.open(filename.c_str());
		if(inFile.fail())
		{
			cout << "Error opening file" << endl;
			exit(1);
		}
		break;
	case 2:
		readStuInfo(inFile, stu1);
		break;
	case 3:
		break;
	}
	}while (choice !=3);

	//Calculations and handle results 
	calcGrades(stu1);
	displayStuInfo(stu1);
	writeStuInfo(outFile, stu1);

	cout << "\nThe class average is " << calcClassAverage(stu1) << endl;
		
	// Close data files
	inFile.close();
	outFile.close();

	return 0;
}

void programDescription()
{
	cout << "This program reads student grade information from" << endl
		 << "a file, displays it in a tabular format, and" << endl
		 << "writes the data to another file." << endl;
}

// Modify function to write contents of entire array of structures to file
void writeStuInfo(ofstream& outFile, StuData stu1[])
{
	for (int i = 0; i < NUMBER_STUDENTS; i++)
		outFile << endl << left << setw(15) << stu1[i].lastName
		<< setw(20) << stu1[i].avgGrade << stu1[i].letterGrade;

}


// Modify function to read contents of entire array of structures from file
void readStuInfo(ifstream& inFile, StuData stu1[])
{
	int i = 0;
	while(i < NUMBER_STUDENTS && inFile >> stu1[i].firstName >> stu1[i].lastName)
	{
		inFile >> stu1[i].ID >> stu1[i].exam[0] >> stu1[i].exam[1] >> stu1[i].exam[2];
		i++;
	}
}

void calcGrades(StuData stu1[])
{
	for (int i = 0; i < NUMBER_STUDENTS; i++)
		stu1[i].avgGrade = (stu1[i].exam[0] + stu1[i].exam[1] + stu1[i].exam[2]) / 3;
	letterGrade(stu1);
}

void letterGrade(StuData stu[])
{
	for( int i = 0; i < NUMBER_STUDENTS; i++)
	{
		if(stu[i].avgGrade >= 90)
			stu[i].letterGrade = 'A';
		else if(stu[i].avgGrade >= 80)
			stu[i].letterGrade = 'B';
		else if(stu[i].avgGrade >= 70)
			stu[i].letterGrade = 'c';
		else if(stu[i].avgGrade >= 60)
			stu[i].letterGrade = 'D';
		else
			stu[i].letterGrade = 'F';
	}
		

}

void displayStuInfo(const StuData stu1[])
{
	// Display header line
	cout << endl << endl
		 << "First   Last      ID     Exam      Exam      Exam      Overall      Letter" << endl
		 << "Name    Name      #      1         2         3         Average      Grade" << endl
		 << "----    ----      ----   ----      ----      -----     -------      -----" << endl;
	// Need loop to display contents of array to screen.
	for (int i = 0; i < NUMBER_STUDENTS; i++)
	{
		cout << left << setw(8);
		cout <<stu1[i].firstName <<setw(10)<< stu1[i].lastName << setw(7)<<stu1[i].ID << setw(10) << stu1[i].exam[0] << setw(10)  
			 << stu1[i].exam[1] << setw(10)  << stu1[i].exam[2];
		cout << setw(13) << stu1[i].avgGrade << setw(10) << stu1[i].letterGrade << endl;
	}
}

float calcClassAverage(const StuData stu1[])
{
	float total = 0;
	for (int i = 0; i < NUMBER_STUDENTS; i++)
		total += stu1[i].avgGrade;

	return total/NUMBER_STUDENTS;
}

[Thumper]

You're inputting a char, but you're treating it as an integer. The integral representation of char '1' is 49, not 1. (read up on ASCII characters)
You have two options to resolve this. Make char choice an int instead (which is what I recommend), or in your switch statement, use characters for the comparison:

switch(choice)
{
case '1': //wrap 1 in single quotation marks to tell the compiler you want the char value
    //do something
case '2':
   //do something else
default:
    break;
}