I have got your site of interest and useful. Iam a student and besides learning programing in class, i take time to teach myself C++ from the internet. i have this exercise in which i got stuck and wish to solicit for help,
do you offer help on such?
if its possible, i should be greatful if you helped on this.
im combining classes and structures.
thanks.





#include <iostream>
#include <fstream>
#include <iomanip>
#include <conio.h>
#include <CTime>
#include <cstdlib>
#include <cmath>
#include <cstring>
#define max 500
// Header files
#include < windows.h >
typedef unsigned short bil;

#define SCR 3
#define Number 4
#define Credit 3
#define Subject 5
class Technology
{
public:
virtual void accept ()=0;
virtual void compute ()=0;
virtual void display ()=0;
};

class Civil: public Technology
{
protected:
struct Students
{
char name[30];
char RegNo[25];
char course[5][5];
};


struct Course
{
char code[5];
float CUnit[5];
float GPsum[4];
;

bil input(bil &x);// introducing a prototype bil
bil score[SCR][2];
bil Total[Number][20];
bil CUnit[Credit][2];



Course courses={ {"CE601",0.0}, // initialize subjects
{"CE602",0.0},
{"CE603",0.0},
{"CE604",0.0},
{"CE605",0.0}}



void accept()
{

cout<<"\tInput Number of Students in this class:\t";
input(Total);
cout<<"\tEnter Credit units for following courses:\t";
for(bil i=0; i<Total;i++)
{
cout<<endl<<courses[i].code<<" CU : ";
cin>>courses[i].CUnit;
GPsum+=courses[i].CUnit;
}

system("cls\0");
students= new Student[Total]; // allocation of memory here
for(i=0;i<Total;i++)
{
cout<<"\nEnter the details of STUDENT number"<<(i+1)<<endl;
cout<<endl<<"Names: ";
cin>>students[i].names;

cout << "\nEnter the RegNo:\t";
cin >>students[i].RegNo;

for(bil k=0;k<SUBS;k++)
{
do{
cout<<"\nEnter the student scores for " <<courses[k].code<<" : \t";
cin>>students[i].score[k];


if((students[i].score[k]<0) ||(students[i].score[k]>100))
{
cout<<"\nInvalid Mark Entered!\nThe marks should range from 0 to 100\n";
}
} while((students[i].score[k]<0) ||(students[i].score[k]>100));

} // end of marks entry loop

}
if (students) delete [] students; // release any allocated memory



}







void compute ()
{

// sorting

for(int s=0;s<Total;s++)
{
for(int p=s+1;p<Total;p++)
{
if ( strcmp(students[s].names, students[p].names)<0 ) // compare the names
{
temp = students[s];
students[s] = students[p];
students[p] = temp;
}
}
}// end of sorting



bestGPA=0.0; // set the best GPA as zero, initially,
students= new Student[Total];
// Computing the GPs & GPA
for(i=0;i<Total;i++)
{
sum=0.0;
for(k=0;k<SUBS;k++)
{
students[i].GP[k]=GetGP(students[i].score[k]); // get the GP for the mark
if(students[i].score[k]>=50) // subject passmark
strcpy(students[i].course[k],PASSED);
else strcpy(students[i].course[k],RETAKE);
} // end of subjects analysis

// computing GPA
for(k=0;k<SUBS;k++) sum+=(courses[k].CUnit * students[i].GP[k]);
students[i].GPA=sum/GPsum; // store the GPA obtained

// normal progress or on probation
if(students[i].GPA< 2.00) strcpy(students[i].unit,PROBATION);
else strcpy(students[i].unit,NORMALPROGRESS);
// determining best student
if(students[i].GPA> bestGPA)
{
bestGPA=students[i].GPA;
best=i;

}

}


}

void display ()
{

cout<<endl; // Retrive marks and GP of any student of interest
cout<<"\tWhich student's Data would you like to retrieve?";
input(i);
cout<<"\tThe Details of student"<<i<<"is"<<score[i-1]<<and GP is"<<GP[i-1]<<endl;


Sleep(2000);
cout << "\n\n" << setw(52) << "PRESS ANY KEY TO DISPLAY TABLE OF RESULTS" ;
getch ();
// display of table of results
cout<<endl;
cout<<setw(65)<<"MAKERERE UNIVERSITY\n"<<endl
<<setw(66)<<"FACULTY OF TECHNOLOGY\n"<<endl<<setw(70)
<<"DEPARTMENT OF ELECTRICAL ENGINEERING \n"<<endl
<<setw(50)
<<"PERFORMANCE LIST FOR YEAR "<<YEAR<<" SEMESTER "<<WHICH<<" ACADEMIC YEAR(2003\\2004) \n"
<<endl;


cout<<setiosflags(ios::left)<<setw(25)<<" ";
for(k=0;k<SUBS;k++)
cout<<setiosflags(ios::left)<<setw(18)<<courses[k].code;

cout<<endl;
cout<<setiosflags(ios::left)<<setw(12)<<"NAME"
<<setw(9)<<setiosflags(ios::left)<<"REG.No.";
for(int j=0;j<SUBS;j++)
{
cout<<setw(6)<< "MARK" // output marks
<<setw(5)<< "GP" // ouptut GP for the mark
<<setw(6)<< "STATE";
} //loop for headers ends here



cout<<setw(5)<<"GPA" // write the student's GPA
<<setw(5)<<"STATUS"<<endl; // indicate whether they have normal progress or not

for(i=0;i<NumOfStudents;i++)
{ // tabulating the results
cout<<endl;
cout<<setiosflags(ios::left)<<setw(15)<<students[i].names<<setw(10)<<se tiosflags(ios::left)<<students[i].RegNo;
for(k=0;k<SUBS;k++)
{
cout<<setprecision(1)<<setw(4)<<setiosflags(ios::fixed)<<students[i]. score[k] // output marks
<<setw(5)<<setprecision(2)<<setiosflags(ios::fixed)<<students[i].GP[k] // ouptut GP for the mark
<<setw(5)<<setiosflags(ios::fixed | ios::left)<<students[i].course[k];
} // end of loop for filing marks and their particulars

cout<<setw(4)<<setprecision(2)<<students[i].GPA // write the student's GPA
<<setw(4)<<students[i].unit; // indicate whether they have normal progress or not(i input [k] here
}
// give name of best student and their GPA
cout<<endl<<endl<<"The best student is:\n\n";

cout<<setiosflags(ios::left)<<setw(10)<<students[best].names<<setw(9)<<se tiosflags(ios::left)<<students[best].RegNo;
for(k=0;k<SUBS;k++)
{
cout<<setprecision(1)<<setw(6)<<setiosflags(ios::fixed)<<students[best]. score[k] // output marks
<<setw(5)<<setprecision(2)<<setiosflags(ios::fixed)<<students[best].GP[k ] // ouptut GP for the mark
<<setw(5)<<setiosflags(ios::fixed | ios::left)<<students[best].course[k];
}
cout<<setw(6)<<setprecision(2)<<students[best].GPA
<<setw(6)<<students[best].unit;
cout<<endl<<endl;
cout<<endl<<"LEGEND\n"
<<"======\n";

cout<<"\nPS PASSED SUBJECT\n"
<<"RT RETAKE\n"
<<"NP NORMAL PROGRESS\n"
<<"PR PROBATION\n"
<<"% PERCENTAGE MARK\n";
cout<<endl<<endl;
return 0;
};

//}

float GetGP(float mark)
{

if( mark>=80) return 5.0;
else if(mark>=75) return 4.5;
else if(mark>=70) return 4.0;
else if(mark>=65) return 3.5;
else if(mark>=60) return 3.0;
else if(mark>=55) return 2.5;
else if(mark>=50) return 2.0;
else if(mark>=45) return 1.5;
else if(mark>=40) return 1.0;
else if(mark>=35) return 0.5;
else return 0.0;
}





int main ()
{
Technology *Fot;
int ret;
char ch;
do
{
cout<<"\n1.DEPARTMENT OF CIVIL ENGINEERING";
cout<<"\n2.DEPARTMENT OF ELECTRICAL ENGINEERING";
cout<<"\n3.DEPARTMENT OF MECHANICAL ENGINEERING";
cout<<"\n4.Exit";
cout<<"\n\nEnter your choice ::";
cin>>(ch);
switch (ch)
{
case '1':
Fot=new Civil;
Fot->accept();
Fot->compute();
Fot->display();
ret=1;
break;
case '2':
Fot=new Electrical;
Fot->accept();
Fot->compute();
Fot->display();
ret=1;
break;

case'3':
Fot=new Mechanical;
Fot->accept();
Fot->compute();
Fot->display();
ret=1;
break;


case '4':
ret=0;
break;
default:
cout<<"\nSorry Input is out of range, Try again";
ret=1;
break;
}
}while(ret);
return 0;
} bil input(bil &x)
{
for(;
{
char trash[max]={0};
cin>>x;
if(cin.fail())
{
cin.ignore();
cin.clear();
}
cin.getline(trash,max);
if(strlen(trash)!=0)
cerr<<setw(50)<<"\tInvalid Data Input, Try again:";
else
break;
}
return x;
}