C++ GPA Result Generator

main.cpp

// Example program
#include <iostream>
#include <string>
#include <iomanip> 
using namespace std;


// Data Structures
typedef struct{
    string title;
    int creditHours;
    } Course;
    
typedef struct{
    string title;
    double marks;
    string grade;
    int creditHours;
    double wgp;
    } Result;   
    
typedef struct{
    string name;
    Result results[10000]; // This is just a hack but it should be equal to the noCourses
    } Student;
    
typedef struct{
    string grade;
    double gradePoint;
    } Grade;
        

// Global variables
 int noStudents, noCourses = 0;
 Grade gradeTable[9];


    
 
 // Function prototypes
 int getGrade(double marks){
                if(marks >= 80.0 && marks<= 100 ) return 0;
           else if(marks >= 75.0 && marks<= 79.9) return 1;
           else if(marks >= 70.0 && marks<= 74.9) return 2;
           else if(marks >= 65.0 && marks<= 69.9) return 3;
           else if(marks >= 60.0 && marks<= 64.9) return 4;
           else if(marks >= 55.0 && marks<= 59.9) return 5;
           else if(marks >= 50.0 && marks<= 54.9) return 6;
           else if(marks >= 45.0 && marks<= 49.9) return 7;
           else if(marks >=    0 && marks<= 44.9) return 8;
           else return -1;
    }
 
 double calcWGP(int creditHours, int grade){
     return creditHours * gradeTable[grade].gradePoint;
     }


int main()
{
   // initialise gradeTable
    gradeTable[0]= {"A", 4.00};
    gradeTable[1]= {"B+", 3.50};
    gradeTable[2]= {"B", 3.25};
    gradeTable[3]= {"B-", 3.00};
    gradeTable[4]= {"C+", 2.50};
    gradeTable[5]= {"C", 2.25};
    gradeTable[6]= {"C-", 2.00};
    gradeTable[7]= {"D", 1.00};
    gradeTable[8]= {"F", 0.00};
    
    cout<<"Welcome to GPA Calculator\n\n|Let's start by adding some courses...\n|"<<endl;
    cout<< "|--> How many courses do you want to create? ";  cin>> noCourses;
    
    // Create a CourseList Array
    Course coursesList[noCourses];
    
    // Add courses to the List 
    cout<<"|Please enter the names and credit hours for the "<<noCourses<< " Courses...\n|Press enter after each entry..."<<endl;    cin.ignore();
    
    // temp course variable
    Course course;
      for(int i=0; i<noCourses; i++) {
        cout<<"|<-- Course "<<i+1<<" title: "; getline(cin,course.title);
        cout<<"|<-- Course "<<i+1<<" credit hours: "; cin>>course.creditHours; cout<<"|\n";  cin.ignore();
        coursesList[i] = course;
        }
        
     
     
    cout<< "|--> How many students do you want to register? ";  cin>> noStudents;
    
    // Create a StudentList Array
    Student studentsList[noStudents];
    
    // Add students to the List
    cout<<"|Please enter the names of the "<<noStudents<< " Students...\n|Press enter after each entry..."<<endl;    cin.ignore();
   
     // temp student variable
    Student student;
    for(int i=0; i<noStudents; i++) {
        cout<<"|<-- Student "<<i+1<<" name: "; getline(cin,student.name);
        studentsList[i] = student;
        }
        
    cout<<"|\n|Geat!, now input the results for the student... "<<endl;
    for(int s=0; s<noStudents; s++){
        cout<<"|--> Enter the results for "<<studentsList[s].name<<endl;
        // temp variable for marks entered
        double marks, wgp; int gradeIndex;
        Result result;
        for(int c=0; c<noCourses; c++){
            cout<<"|<--Enter the marks for "<<coursesList[c].title<<": "; cin>>marks;
            // Add to student's results
            gradeIndex = getGrade(marks);
            wgp = calcWGP(coursesList[c].creditHours, gradeIndex);
             result.title= coursesList[c].title;
             result.marks= marks;
             result.creditHours= coursesList[c].creditHours;
             result.grade = gradeTable[gradeIndex].grade;
             result.wgp= wgp; 
           studentsList[s].results[c] = result;
             
          };
cout<<"|\n";
       }

             //Print Results
        cout<<"\n\nSECOND SEMESTER RESULTS\n**************";
    for (int s=0; s< noStudents; s++){
      cout<<"\n\nStudent Name: "<<studentsList[s].name<<endl;
      cout<<setw(30) << left<< "Course Title"<<setw(8) << left <<"Mark"<<setw(8) << left <<"Grade"<<setw(8) << left<<"CHrs"<<setw(8) << left <<"WGP\n************************************************************"<<endl;
      for(int r=0; r<noCourses; r++){
        string title = studentsList[s].results[r].title;
        double marks = studentsList[s].results[r].marks;
        string grade = studentsList[s].results[r].grade;
        int creditHours = studentsList[s].results[r].creditHours;
        double wgp = studentsList[s].results[r].wgp;
       cout << setw(30) << left <<title<< setw(8) << left <<marks<<setw(8) << left <<grade<<setw(8) << left <<creditHours<<setw(8) << left <<wgp<<endl;
      }
      cout<<"************************************************************";

  }              }