Using TryCatch in functions

[rshoe]

I am learning to use the Try Catch Throw but I am having a hard time getting all of the throws to work. I have to throw each of my functions with a string of Bad Major if a Major is 0. I can get only one of my functions to work. If anyone has a suggestions I would appreciate it.

Thanks,
R.

Here is my code:

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

using namespace std;


struct Student
{
	char Name[30];
	float GPA;
	int Major;
};


Student StudentData(Student &s);
void ChangeData(Student *s);
void GetStudents(Student st[], short size);
void PrintStudents(Student st[], short size);


int main()
{
	//#1 create 2 instances of that structure. Call them S1 and S2. 
	Student S1;
	Student S2;

	try
	{
	// S2 = StudentData( S1 ); //this is the call to the function
	S2 = StudentData(S1);


	//#3. print the data stored in the structures S1 and S2 using cout.
	cout << endl;
	cout << "Structor Student S2 info " << endl;
	cout << "Student Name:" << S2.Name << endl;
	cout << "Student GPA: " << S2.GPA << endl;
	cout << "Student Major: " << S2.Major << endl;

	cout << endl;

	cout << "Structor Student S1 info " << endl;
	cout << "Student Name: " << S1.Name << endl;
	cout << "Student GPA: " << S1.GPA << endl;
	cout << "Student Major: " << S1.Major << endl;


	cout << endl;

	
	//#4. Call a function named ChangeData with a pointer to S2 as the argument:
    //        ChangeData( &S2 ); //this is the call to the function

	ChangeData(&S2);
	
	
	//#5. Back in main print the data stored in the structure S2 using cout.
	cout <<"The student's name from ChangeData is: " << S2.Name << endl;
	cout <<"The student's GPA from ChangeData is: " << S2.GPA << endl;
	cout <<"The student's Major from ChangeData is: " << S2.Major << endl;


	cout << endl;

	//#6. Create an array of 2 structures in main. Call the array Students.
	Student Students[2];

	//#8. Call the function GetStudents from main.
	GetStudents(Students, 2);


	cout << endl;

	cout << "Here are the students from the GetStudents Function " << endl;
	cout << "====================================================" << endl;
	cout << "Number" << setw(20) << "Student Name" << setw(11) << "GPA" << setw(9) << "Major" << endl;

	//#9. Call the function PrintStudents
	PrintStudents(Students, 2);
	}
	catch(char *e)
	{
		cout << e << endl;
	}

	cout << endl;
	

	system("pause");
	return 0;
}



//#2. Create and call a function named StudentData:
//   S2 = StudentData( S1 ); //this is the call to the function
//The function receives as a parameter a reference to the structure 
//(prototyping will handle this) and will return a reference to the structure. 
//Use couts and cins for getting data from the user. For testing purposes, 
//change the data in S1 so that the GPA is 3.5 and the Major is 2. 
//Since you are to use cins for getting data from the user, you are the user 
//and just enter these values. After the call to the function both S1 and S2 
//will contain the same data.

Student StudentData(Student &s)
{

	if(s.Major == 0)
	{
		throw "Bad Major from StudentData function";
	}
	else
	{
	
	//Get the Student Name
	cout << "Enter the student name: ";
	cin.getline(s.Name, 31);

	//Get the Student GPA
	cout << "Enter the student GPA: ";
	cin >> s.GPA;

	//Get the Student Major
	cout << "Enter the student Major: "; 
	cin >> s.Major;

	cin.ignore();
	}
	
	return s;
	
}

//#4 . Call a function named ChangeData with a pointer to S2 as the argument:
//     ChangeData( &S2 ); //this is the call to the function
//Change the data in S2 so that the GPA is 3.0 and the Major is 1. 
//(Using these values for testing…)
void ChangeData(Student *s)
{

	if(s->Major == 0)
	{
		throw "Bad Major from ChangeData function";
	}
	else
	{
	s->GPA = 3.0;
	s->Major = 1;
	}

}

//#7. Create a function, GetStudents, which will receive the array and an int 
//representing the number of elements(2). In the function, loop through the data 
//and get all three fields from the user using cin, cin.getline and cout statements. 
//Organize like this: 
//                  for (...........) 
//                  { 
//                        cout prompt to user 
//                         cin.getline for name 
//                         cout prompt to user 
//                         cin for GPA
//                         cout promp to user
//                         cin for Major 
//                          cin.ignore(1); 
//                      }
//The problem is that a cin for a numeric value will leave the ENTER key in the 
//keyboard buffer and that is OK with cin and other numbers but not with strings, 
//thus we must remove it on our own. cin.ignore should handle this for us.
void GetStudents(Student st[], short size)
{

	for(int cnt = 0; cnt < size; cnt++)
	{
		
		if(st[cnt].Major == 0)
		{
		throw "Bad Major from GetStudents function";
		}
		else
		{
		
		cout << "Enter the student's name " << endl;
		cin.getline(st[cnt].Name, 30);

		cout << "Enter the student's GPA " << endl;
		cin >> st[cnt].GPA;

		cout << "Enter the student's Major " << endl;
		cin >> st[cnt].Major;
		}

		cin.ignore();

	}

}


//9. Create a function, PrintStudents, which will receive the same arguments as GetStudents. 
//It will print out the array of students on 2 lines, 1 line per student.
void PrintStudents(Student st[], short size)
{
	for(int cnt = 0; cnt < size; cnt++)
	{
		cout <<"#" << (cnt + 1) << setw(25) << st[cnt].Name << setw(10) << st[cnt].GPA << setw(7) << st[cnt].Major << endl;
	}
}