While loop for student grage average

[jstew07]

I'm trying to create a program using a while loop where the user can enter the number of students, and then enter then name, and 3 test grades for each student to calculate each students grade average and letter grade. My program runs, but ignores my loop and treats it sequentially. Any tips on where I am going wrong would be most appreciated!

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

int main()
{
 string studFirstName, studLastName;
 int counter, NumStudents, studExam1, studExam2, studExam3, studScore, studAvg; 
 char grade;

 cout << "Enter number of students:";
 cin >> NumStudents;
 cout << endl;
 
 counter = 0;
 while (counter <= NumStudents)
 {
 cout <<"Enter Student first name: ";
 cin>> studFirstName;
 cout <<"Enter student last name: ";
 cin>> studLastName;
 cout <<"Enter score for exam 1: ";
 cin>> studExam1;
 cout <<"Enter score for exam 2: "; 
 cin>> studExam2;
 cout <<"Enter score for exam 3: "; 
 cin>> studExam3;

 studScore = studExam1 + studExam2 + studExam3;
 studAvg = studScore / 3 ;
 counter++;
}

 cout <<"Student's Final Grade: " << studAvg << endl;

 if (studAvg >= 90) 
 grade = 'B';
 else if (studAvg >=80) 
 grade = 'B';
 else if (studAvg >=70)
 grade = 'C';
 else if (studAvg >=60) 
 grade = 'D';
 else 
 grade = 'F';
 
 cout <<"Grade: " << grade << endl; 

 system ("pause");

 return 0;
}

[wwwiii]

why dont you put the final grade inside the loop?

[J4ke]

All of this code should be in your while loop.

 cout <<"Student's Final Grade: " << studAvg << endl;

 if (studAvg >= 90) 
 grade = 'B';
 else if (studAvg >=80) 
 grade = 'B';
 else if (studAvg >=70)
 grade = 'C';
 else if (studAvg >=60) 
 grade = 'D';
 else 
 grade = 'F';
 
 cout <<"Grade: " << grade << endl; 

Also, for the checking if the grade is above 90, I believe you meant to put 'A', where you put 'B' instead.

[jstew07]

Thanks everyone! I think I fixed it, the program runs great now:

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

int main()
{
 string studFirstName, studLastName;
 int counter, NumStudents, studExam1, studExam2, studExam3, studScore, studAvg; 
 char grade;

 cout << "Enter number of students: ";
 cin >> NumStudents;
 cout << endl;
 
 counter = 0;
 while (counter < NumStudents)
 {
 cout << endl;
 cout <<"Enter Student first name: ";
 cin>> studFirstName;
 cout <<"Enter student last name: ";
 cin>> studLastName;
 cout <<"Enter score for exam 1: ";
 cin>> studExam1;
 cout <<"Enter score for exam 2: "; 
 cin>> studExam2;
 cout <<"Enter score for exam 3: "; 
 cin>> studExam3;

 studScore = studExam1 + studExam2 + studExam3;
 studAvg = studScore / 3 ;

 if (studAvg >= 90) 
 grade = 'A';
 else if (studAvg >=80) 
 grade = 'B';
 else if (studAvg >=70)
 grade = 'C';
 else if (studAvg >=60) 
 grade = 'D';
 else 
 grade = 'F';
 
 cout << studFirstName << " " << studLastName << endl;
 cout << "Average Score: " << studAvg << endl;
 cout <<"Student's Final Grade: " << grade << endl;
  counter++;
}

 system ("pause");

 return 0;
}