how to use while loop to answer

Question

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Write a program that asks the user for the number of students in the class. The program then asks the user for the grade of each student and computes/displays the average grade in the class. You are required to use a while loop.

C

#include <iostream>
using namespace std;
int main (){
	int studentNum;
	int sudentGrade;
	int avarageGrade;
	int countStudent = 0;
	cout << "Please enter the number of student = ";
	cin >> studentNum;
	while (studentNum>countStudent)
	{
		cout << "Please enter the grade = ";
		cin >> sudentGrade;

	}
	system("pause");
	return 0;
}

Posted 20-Oct-15 14:41pm

Assam ALzookery

Updated 20-Oct-15 23:15pm

phil.o

v3

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Comments

Matt T Heffron 20-Oct-15 20:52pm

Clearly this is homework.
You should at least try to do it yourself.
If necessary, come back and ask a question afterwards.

Assam ALzookery 20-Oct-15 20:56pm

i really did but i have hard time to calculate the average of the grades

#include <iostream>
using namespace std;
int main (){
int studentNum;
int sudentGrade;
int avarageGrade;
int countStudent = 0;
cout << "Please enter the number of student = ";
cin >> studentNum;
while (studentNum>countStudent)
{
cout << "Please enter the grade = ";
cin >> sudentGrade;

}
system("pause");
return 0;
}

Matt T Heffron 20-Oct-15 21:00pm

Use the "Improve question" above and move this code to there.
Be sure to use the correct formatting (use the "code" button in the editor and select the C++ language.)

Assam ALzookery 20-Oct-15 21:02pm

i did please try to answer my question if you can
Thank you.

Matt T Heffron 20-Oct-15 21:08pm

Ok, you should know the definition of average (i.e., the mean). It is the sum of the values divided by the number of values. So after you read in a grade you should add it into your variable holding the average. (You need to increment the countStudent each time or you'll loop forever.) Then after the loop, print out an appropriate string and then the result of dividing the sum of the individual grades by the count.

[no name] 21-Oct-15 16:19pm

Quote: " So after you read in a grade you should add it into your variable holding the _average_"....

That can lead to confusion for OP.

Matt T Heffron 21-Oct-15 16:30pm

Possibly. I had already explained the average is formed from the sum of the values. I try to give the OP a little credit, but allow them to discover other issues on their own. (Like taking an average using only integer arithmetic! I was actually expecting that to be the next follow-up question.)

[no name] 21-Oct-15 16:40pm

Yep I see it after reading more exactly, sorry for my hasty comment.

Avg with int: maybe he takes enough students, that avg is precise enough also with int :laugh:

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CPallini · Answer 1 · 2015-10-20T23:25:00

Solution 2

You should sum up the grades of all the students. It can be done incrementally, in the while loop (don't forget to initialize to 0 the grade sum before entering the loop). At the end of the loop compute the average grade value by dividing such sum by the number of the students.

Posted 20-Oct-15 23:25pm

CPallini

Comments

Matt T Heffron 21-Oct-15 12:53pm

Isn't that essentially what I said in my comment above? ;-)
+5

CPallini 21-Oct-15 15:43pm

Yes, it is :-D
By the way, thank you.