Grade Distribution

[khatereh]

One last part of my program is to do grade distribution and display it along with starts.
I have no idea how to do this.

  #include <iostream>
#include <string>

#include "Student.h"
using namespace std;

//float avg(Student *obj, int size);

int main(){
	
	int numOfStudents;

	cout << " Please enter the number of students " << ":";
	cin >> numOfStudents;
	Student *s = new Student[numOfStudents];
	cout << "Please enter student data" << ":" << endl;

	string studentName;
	int studentGrade = 0;

	for (int i = 0; i < numOfStudents; i++){
		cout << "Name " << ": ";
		cin >> studentName;
		cout << "Grade " << ":";
		cin >> studentGrade;
		s[i].setName(studentName);
		s[i].setGrade(studentGrade);
		cout << s[i].getName() << endl;
		cout << s[i].getGrade() << endl;
	}

	int sub=0; float avg = 0;

	for (int i = 0; i < numOfStudents; i++){
		sub += s[i].getGrade();
	}
	avg = sub / (float)(numOfStudents);
	cout <<"Class average:" << avg << endl;
	cout << endl;

	int score = 0;
	for (int i = 0; i < numOfStudents; i++){
		score = s[i].getGrade();




	cout << "Grade distribution:" << endl;
	cout << " 0-9:" << endl;
	cout << "10-19:" << endl;
	cout << "20-29:" << endl;
	cout << "30-39:" << endl;
	cout << "40-49:" << endl;
	cout << "50-59:" << endl;
	cout << "60-69:" << endl;
	cout << "70-79:" << endl;
	cout << "80-89:" << endl;
	cout << "90-99:" << endl;
	cout << "100:" << endl;

[shadder]

What output are you expecting after grade distribution?

[Duthomhas]

It should look something like

Grade distribution:
 0-9:  *
10-19: 
20-29: 
30-39: *
40-49: *
50-59:
60-69: ***
70-79: ****
80-89: *********
90-99: ***********
100:   **

What you need to do is

1) Pay attention to the spaces after the colon before the stars start
2) Write a function that returns a string of n stars.

How you manage the distribution is up to you. You can, if you want to leave it to just have the same number of stars printed as there are students.

cout << "70-79: " << n_stars( count_students_with_grade_in( s, numOfStudents, 70, 79 ) ) << "\n";

You'll need two functions to help, of course:

string n_stars( int n );

int count_students_with_grade_in( Student* s, int n, int min_grade, int max_grade );

(I presume a student's grade is an int. If it is not, change the min/max grade thing to the proper data type.)

Hope this helps.

[khatereh]

I did it without using functions(I have to use function tho), it kind of works but the spacing is off.
Here's what I did:

cout << "0-9:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 0 && s[i].getGrade() <= 9)
			cout << "*\n";
	}

	cout << "10-19:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 10 && s[i].getGrade() <= 19)
			cout << "*\n";
	}

	cout << "20-29:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 20 && s[i].getGrade() <= 29)
			cout << "*\n";
	}

	cout << "30-39:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 30 && s[i].getGrade() <= 39)
			cout << "*\n";
	}

	cout << "40-49:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 40 && s[i].getGrade() <= 49)
			cout << "*\n";
	}

	cout << "50-59:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 50 && s[i].getGrade() <= 59)
			cout << "*\n";
	}

	cout << "60-69:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 60 && s[i].getGrade() <= 69)
			cout << "*\n";
	}

	cout << "70-79:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 70 && s[i].getGrade() <= 79)
			cout << "*\n";
	}

	cout << "80-89:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 80 && s[i].getGrade() <= 89)
			cout << "*\n";
	}

	cout << "90-99:\n";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() >= 90 && s[i].getGrade() <= 99)
			cout << "*\n";
	}

	cout << "100:";
	for (int i = 0; i < numOfStudents; i++){

		if (s[i].getGrade() == 100)
			cout << "*";
	}

	cout << endl;

I'm gonna try your way.
Thanks!!

[Duthomhas]

What you've got is very good. Just notice that when you find yourself doing the same thing over and over, that thing is a good candidate for a function.

[khatereh]

That's, right. I just don't know how use my if statements inside the function.

[Duthomhas]

The values that are different should be arguments to the function.