code to calculate class average

[canx]

I'm really struggling with this problem. My instructor is asking that i get scores and calculate avergage in getScoresFindAverage instead of main, and have the function return the average to main so it can be passed to toletterGrade.
I am thoroughly confused. I know that this code is not what i need, it will compile correctly but doesnt ask for scores or anything.
Unfortunately this is an online class and i cant really ask my instructor for help, she just suggested i find a tutor :/

I hope you guys can help me, i'd really appreciate it.

  // File: Lesson21 P 2

#include <cstdlib>
#include <iostream>
using namespace std;

// function prototypes
	double midterm = 0.0;
	double final = 0.0;
	double project = 0.0;
	double average = 0.0;
int main()
{   
	double average = 0.0;
	 
    cout << "This program calculates your class average." << endl << endl;

	average = (midterm + final + project)/3;

	
	cout << "Calculated Average: " <<  average << endl;   
    
    system("pause");
    return (0);
}


double getScoresFindAverage()
{
    double midterm = 0.0;
	double final = 0.0;
	double project = 0.0;
	double average = 0.0;
		
	cout << "Enter midterm score: ";
	cin >> midterm;
	cout << "Enter final score: ";
	cin >> final;	
	cout << "Enter project score: ";
	cin >> project;	
	average = (midterm + final + project)/3;
	cout << "Average score: " << average << endl;	

		
	system("pause"); 
	return average;

}


void toLetterGrade(double average)
{ 
	char courseGrade = ' ';
	if (average >= 90)
	{
		courseGrade = 'A';
	}
	else if (average >= 80 && average < 90)
	{
		courseGrade = 'B';
	}
	else if (average >= 70 && average < 80)
	{
		courseGrade = 'C';
	}
	else if (average >= 60 && average < 70)
	{
		courseGrade = 'D';
	}
	else if (average < 60)
	{
		courseGrade = 'F';
	}
	cout << "Course grade: " << courseGrade << endl;
}    

[LB]

Your topic is marked as solved, do you still need help or did you click the button by accident?

[Immo]

Also in the same boat as LB, but I'll answer anyway.

The problem here is that you are not calling your functions in main(). Also a couple of other little problems that I tried touching upon via comments. Look at the code and compare it to yours to see what's different and why it works the way it works.

#include <iostream>
// <cstdlib> is not needed at all in this program so it was omitted
using namespace std;

// function prototypes
void getScores(double&, double&, double&);
double findAverage(double&, double&, double&, double&);
char toLetterGrade(double);

int main()
{
    double midterm = 0.0;   // initializing variables locally in main() to pass through to other functions
	double final = 0.0;     // it works fine in a small program like this and will help get you acquainted
	double project = 0.0;   // to the idea of modularization in your programs
    double average = 0.0;
    
    cout << "This program calculates your class average." << endl << endl;
    
    // although you could get the scores and return the average, it's best to have one function carry out one operation
    // in this case, one function gets the scores and the other finds the average. again, it's about modularization.
    getScores(midterm, final, project);
    
    // note how the functions are being called here.
    // non-void are used like this in output streams to output whatever value is being returned.
    // therefore, it works like a variable.
    // you just do not explicity call on the name of the variable, although you could after calling it if you modified it again.
    // doing so would just output 0.0, which is not what you're after
    cout << "Calculated Average: " << findAverage(midterm, final, project, average) << endl <<
            "Letter Grade: " << toLetterGrade(average) << endl;
    
    system("pause"); // remember, this only goes inside of main() or else you'd pause the program elsewhere
    return 0;
}

// prompts user for input
void getScores(double& midterm, double& final, double& project)
{
    cout << "Enter midterm score: ";
	cin >> midterm;
	cout << "Enter final score: ";
	cin >> final;
	cout << "Enter project score: ";
	cin >> project;
}

// finds the average and returns it when called upon in main()
double findAverage(double& midterm, double& final, double& project, double& average)
{
    average = (midterm + final + project) / 3;
    
    return average;
}

// depending on the average, it returns the letter grade.
// It works better than having it set up as a void function 
// because it works on modularizing the program you have set up.
char toLetterGrade(double average)
{
	char courseGrade = '\0';
    
	if (average >= 90)
	{
		courseGrade = 'A';
	}
	else if (average >= 80 && average < 90)
	{
		courseGrade = 'B';
	}
	else if (average >= 70 && average < 80)
	{
		courseGrade = 'C';
	}
	else if (average >= 60 && average < 70)
	{
		courseGrade = 'D';
	}
	else if (average < 60)
	{
		courseGrade = 'F';
	}
	
    return courseGrade;
}