How to make it possible - c++

Question

My topic may be confusing, this is my code in C++,how can i display the summary of number of student count for each Grade at the end of the program,can any body help in this?
#include <iostream>
#include <fstream>
#include <time.h>
#include <iomanip>
#include <algorithm>
#include <vector>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main(int argc, char** argv) {
This is the output i want,can anybody helP?
This is my actual output
[Output of the program][1]
edit: thanks for the responses, since im currently taking a required programming class, and while ive had literally 100% of the material before, I had it all in C++, so im not very good with the syntax yet, and we are told only with functions/loops/methods that have been discussed in lecture , looks like i still need to put more effort into it.

Answer 1

I'm not sure if I understand the problem correctly, but you could increment specified counters each time you determined the grade in your if-else-cascade and then std::cout the results after the while loop.

Answer 2

You could try what Wum suggested, so the code might look like this:
#include <iostream>
#include <fstream>
#include <time.h>
#include <iomanip>
#include <algorithm>
#include <vector>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main(int argc, char** argv) {
char date[9];
ifstream in;
ofstream out;
string name;
char grade;
double asg1, asg2, test, quiz, exam, coursework, overallScore, numbergrade;
int numStudentsA = 0;
int numStudentsB = 0;
int numStudentsC = 0;
int numStudentsD = 0;
int numStudentsF = 0;
in.open("Student.txt");
out.open("Result.txt");
in >> name >> asg1 >> asg2 >> test >> quiz >> exam;
//to keep reading the data in input file
while (!in.eof()) {
coursework = asg1 + asg2 + test + quiz;
overallScore = coursework + exam;
if (overallScore >= 70 ) {
grade = 'A';
numStudentsA++;
}
else if (overallScore >= 60) {
grade = 'B';
numStudentsB++;
}
else if (overallScore >= 50) {
grade = 'C';
numStudentsC++;
}
else if (overallScore >= 40) {
grade = 'D';
numStudentsD++;
}
else if (overallScore >= 0) {
grade = 'F';
numStudentsF++;
}// grade
out << left << setw(15) << name ;
out << left << setw(3) <<coursework ; //coursework
out << left << setw(3) << exam ; //exam
out << left << setw(4) << overallScore ; //overall score
out << grade ;
out << endl;
in >> name >> asg1 >> asg2 >> test >> quiz >> exam;
}
cout << "Result Summary Date: " << date << endl;
cout << "Subeject: Programming Methodology" << endl;
cout << "Grade" << setw(10) << "Student" << endl;
cout << "A" << setw(10) << numStudentsA << endl;
cout << "B" << setw(10) << numStudentsB << endl;
cout << "C" << setw(10) << numStudentsC << endl;
cout << "D" << setw(10) << numStudentsD << endl;
cout << "F" << setw(10) << numStudentsF << endl;
cout << "Total Student = 10" << endl;
return 0;
}
I applied a bit of indentation to your code, try to use a single coding style. Also, you should read why the use of eof() is not recommended.

Answer 3

use a array to count the number of students for each grade and print out the array at the end.[ look for inline comments ]
Using a enum to index into the array for easy readability.
Instead of an array you could use maps was one of the suggestions .
eof in the above case is fine as , The first read is outside the while loop and then the check is done at the start. Also the subsequent reads are at the end of the while so the program will loop back right after the read to check the eof conditions and exit (without processing an empty buffer).
The code below checks for while (in>>name>>asg1>>asg2>>test>>quiz>>exam)
#include <iostream>
#include <fstream>
#include <time.h>
#include <iomanip>
#include <algorithm>
#include <vector>
enum { GRADE_A = 0 , GRADE_B = 1, GRADE_C = 2 , GRADE_D = 3 ,GRADE_F = 4}; // use an enum to index into the array for each grade
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main(int argc, char** argv) {
char date[9];
_strdate(date);
ifstream in;
ofstream out;
int grades[5]; // to store the grades count
string name;
char grade;
double asg1,asg2,test,quiz,exam,coursework,overallScore,numbergrade;
in.open("Student.txt");
out.open("Result.txt");
grades[GRADE_A] = 0 ; grades[GRADE_B] = 0 ; grades[GRADE_C] = 0 ; grades[GRADE_D] = 0 ; grades[GRADE_F] = 0 ; // initialize array
while (in>>name>>asg1>>asg2>>test>>quiz>>exam) //to keep reading the data in input file
{
coursework = asg1 + asg2 + test + quiz;
overallScore = coursework + exam;
if (overallScore >= 70 )
{grade = 'A' ;grades[GRADE_A]++;} // increment count for each grade
else if (overallScore >= 60)
{grade = 'B' ;grades[GRADE_B]++;}
else if (overallScore >= 50)
{grade = 'C' ;grades[GRADE_C]++;}
else if (overallScore >= 40)
{grade = 'D' ;grades[GRADE_D]++;}
else if (overallScore >= 0)
{grade = 'F' ;grades[GRADE_F]++;}; // grade
out<< left << setw(15) << name ;
out<< left << setw(3) <<coursework ; //coursework
out<< left << setw(3) << exam ; //exam
out<< left << setw(4) << overallScore ; //overall score
out<< grade ;
out<< endl;
}
cout<<"Result Summary Date: " << date << endl;
cout<<"Subeject: Programming Methodology"<<endl;
cout<< "Grade"<< setw(10) << "Student" <<endl;
cout<< "A" <<setw(10)<<grades[GRADE_A]<<endl; // output grade count
cout<< "B" <<setw(10)<<grades[GRADE_B]<<endl;
cout<< "C" <<setw(10)<<grades[GRADE_C]<<endl;
cout<< "D" <<setw(10)<<grades[GRADE_D]<<endl;
cout<< "F" <<setw(10)<<grades[GRADE_F]<<endl;
cout<<setw(0)<<endl;
cout<<"Total Student = 10"<<endl;
//At the end of the program, display the summary of number of student count for each Grade