C Plus Plus Project : Course manegment

Cpp Project: Course Management

 //course manegment  
 #include<iostream>  
 #include<cstdio>  
 #include<string>  
 #define l 50  
 using namespace std;  
 char gr;  
 int total_course;  
 class course_class  
 {  
 private:  
   string course_code;  
   string course_title;  
   int course_credit;  
   string course_instructor;  
   float course_result;  
 public:  
   void c_entry (int i);  
   void p_info(int i);  
   void i_result();  
   float conv_result(string result);  
   void print_result();  
   float cal_cgpa();  
 } course[15];  
 //main function start  
 int main()  
 {  
   int a,i=0;  
   while(1)  
   {  
     cout << "\n\n\n\t\n";  
     cout << "\t        WELCOME                      \n\n\n";  
     cout << "\t 1.Press 1 to add a new course.(if you are advisor)       \n";  
     cout << "\t 2.Press 2 to input result.(if you are course instructor)    \n";  
     cout << "\t 3.Press 3 to get your result.(if you are student)       \n";  
     cout << "\t 4.Press 4 to EXIT!!                      \n";  
     cout << "\t                                 \n";  
     cout << "\t\n";  
     cout << "\n        What do you want?(1,2,3,4): ";  
     cin >> a;  
     while(a<1||a>4)  
     {  
       cout << "\n\tYour entry was invalid\n";  
       cout << "\tPlease select one of the action from the above list: ";  
       cin >> a;  
     }  
     switch(a)  
     {  
     case 1:  
       course[i].c_entry (i);  
       course[i].p_info(i);  
       i++;  
       total_course=i;  
       break;  
     case 2:  
       course[i].i_result();  
       break;  
     case 3:  
       course[i].print_result();  
       break;  
     }  
     if(a==4)  
       break;  
   }  
   return 0;  
 }  
 void course_class::c_entry (int i)  
 {  
   gr=getchar();  
   cout << "\n\tEnter course code    : ";  
   getline(cin,course[i].course_code);  
   cout << "\tEnter course title   : ";  
   getline(cin,course[i].course_title);  
   cout << "\tEnter course credit   : ";  
   cin >> course[i].course_credit;  
   gr=getchar();  
   cout << "\tEnter course instructor : ";  
   getline(cin,course[i].course_instructor);  
   cout << "\n\t\n";  
   cout << "\t  You have successfully added another course.    \n";  
   cout << "\t \n\n";  
 }  
 void course_class::i_result()  
 {  
   int i;  
   string temp,result;  
   gr=getchar();  
   cout << "\t\n";  
   cout << "\t   Enter course code   : ";  
   getline(cin,temp);  
   cout << "\t   Enter result      : ";  
   getline(cin,result);  
   cout << "\t\n";  
   for(i=0; i<total_course; i++)  
   {  
     if(temp==course[i].course_code)  
       break;  
   }  
   course[i].course_result=course[i].conv_result(result);  
 }  
 float course_class::conv_result(string result)  
 {  
   if(result=="A+" || result=="a+")  
     return 4.00;  
   if(result=="A" || result=="a")  
     return 4.00;  
   if(result=="A-" || result=="a-")  
     return 3.70;  
   if(result=="B+" || result=="b+")  
     return 3.30;  
   if(result=="B" || result=="b")  
     return 3.00;  
   if(result=="B-" || result=="b-")  
     return 2.70;  
   if(result=="C+" || result=="c+")  
     return 2.30;  
   if(result=="C" || result=="c")  
     return 2.00;  
   if(result=="C-" || result=="c-")  
     return 1.70;  
   if(result=="D+" || result=="d+")  
     return 1.30;  
   if(result=="D" || result=="d")  
     return 1.00;  
   if(result=="F" || result=="f")  
     return 0.00;  
 }  
 void course_class::print_result()                     //print out the final result  
 {  
   int i;  
   cout << "\t \n";  
   cout << "\t Student Name  : Shadia Islam         \n";  
   cout << "\t Student Id   : 2013-60-047         \n";  
   cout << "\t \n";  
   for(i=0; i<total_course; i++)  
   {  
     cout << "\t " << course[i].course_code << "  : " << course[i].course_result << "\n";  
   }  
   cout << "\n\t CGPA  : " << cal_cgpa();  
   cout << "\n\t It's Not bad";  
   cout << "\n\n";  
 }  
 float course_class::cal_cgpa()  
 {  
   int i;  
   float total_point=0.0,cgpa;  
   int total_credit=0;  
   for(i=0; i<total_course; i++)  
   {  
     total_credit += course[i].course_credit;  
     total_point += course[i].course_credit * course[i].course_result;  
   }  
   return total_point/total_credit;  
 }  
 void course_class::p_info(int i)  
 {  
   cout << "\n\tCourse Code    : " << course[i].course_code;  
   cout << "\n\tCourse title   : " << course[i].course_title;  
   cout << "\n\tCourse Credit   : " << course[i].course_credit;  
   cout << "\n\tCourse Instructor : " << course[i].course_instructor;  
 }