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:
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 ChangeData 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; } }
