[alexb9054]

Assignment Questions:

4. Calculate each student letter grade using a function, save the letter grade to another array defined in main function.
5. Return the count of the grades for each letter grade (A, B, C,D, F) using a function
6. Perform a selection sort on the number grade array into descending order and output them again using functions.


I need some help on the last 3 questions of my assignment and I cannot figure out how to do it. Here's my code so far. I just don't know how to save them in an array etc. The code worked perfect before I tried to get the letter grade code working. I have no idea how to do this. Could someone help me or even better give me an example of something similar and explain it. I've been stuck on this for the past 4 hours.

#include <iostream>
#include <cmath>
#include <string>
#include <math.h>

using namespace std;
//Global Function
void averageMaxCalc(int scoreInput[5], int sumZ, double& sAverage, double& sAverageF);
void studentScoreCalc(int scoreInput[5], int sum);//Function studentScore()
void deviation(int scoreInput[5], int sum);
int letterGradesA(int scoreInput[5], char letterDefined);

//|=======================|
//|======== Main =========|
//|=======================|
int main (char LetterDefined)
{
	cout << "Welcome to the student score calculator program.\n\n";
	//Variables
	int scoreInput[5], sum = 0, sumZ = 0;
	double sAverage, sAverageF;

	//Defined
	char letterDefined;
	char letterGrades[6];
	for (int m = 0; m < 6; ++m) 
	{
		letterDefined = letterGrades[m];
	}


	//Functions Within Main()
	studentScoreCalc(scoreInput, sum);//Function StudentScore()
	averageMaxCalc(scoreInput, sumZ, sAverage, sAverageF);//Function averageMaxCalc()
	deviation(scoreInput, sum);//Function deviation()
	//letterGradesA() returned
	letterGradesA(scoreInput, letterDefined);

	system("pause");
	return 0;

}
//|=====================================|
//|=== 1. Student Input and Max/Less ===|
//|=====================================|
void studentScoreCalc(int scoreInput[5], int sum)
{
	//Declearing Variables
	sum = 0;

	cout << "Please Enter Student Scores below: \n";//Outputs to Console
	//Sum is set to 0

	//Looping countScore and i 15x
	for (int i = 0; i <5; i++)
	{
		cin >> scoreInput[i];//Creates User Input
		
	}
}

//|=================================|
//|=== 2. Funtion averageMaxCalc ===|
//|=================================|
void averageMaxCalc(int scoreInput[5], int sumZ, double& sAverage, double& sAverageF)
{
	sumZ = 0;//Set sumZ to 0;

	//Gets Sum Of All Numbers
	sumZ = scoreInput[0]+scoreInput[1]+scoreInput[2]+scoreInput[3]+scoreInput[4];
	//Finds The Average
		sAverage = sumZ / 5;//Finds Average
		sAverageF = (sumZ%5)*2;//Finds Decimal
		cout << "The Sum Of All Scores Is: " <<sumZ << "\n"
			 << "The Average Is: " << sAverage << "." << sAverageF << endl; 
}
//|===================================|
//|=== 3. Calculation of Deviation ===|
//|===================================|
	void deviation(int scoreInput[5], int sum)
	{
		double eX2Input;
		double eXInput;
		double variance;
		double sDeviation;

		//Gets EX^2
		eX2Input = pow(scoreInput[0], 2) + pow(scoreInput[1], 2) + pow(scoreInput[2], 2) + pow(scoreInput[3], 2) + pow(scoreInput[4],2);
		eXInput = scoreInput[0] + scoreInput[1] + scoreInput[2] + scoreInput[3] + scoreInput[4];
		variance = (5*(eX2Input)-(eXInput))/(5 * (5-1));//Calculates Variance
		sDeviation = sqrt(variance);//Calculates Standard Deviation
		//Testing output
		cout << "The Standard Deviation is: " << sDeviation << endl;
	}
//|===============================================|
//|======= 4. Grades Converted To Letters ========|
//|===============================================|
int letterGradesA(int scoreInput[5], char letterDefined)
{

	if(scoreInput[0] <= 100)
		scoreInput[0] = 'A';
	else if(scoreInput[0] < 90)
		scoreInput[0] = 'B';
	else if(scoreInput[0] < 80)
		scoreInput[0] = 'C';
	else if(scoreInput[0] < 70)
		scoreInput[0] = 'D';
	else if(scoreInput[0] < 60)
		scoreInput[0] = 'F';

	if(scoreInput[1] <= 100)
		scoreInput[1] = 'A';
	else if(scoreInput[1] < 90)
		scoreInput[1] = 'B';
	else if(scoreInput[1] < 80)
		scoreInput[1] = 'C';
	else if(scoreInput[1] < 70)
		scoreInput[1] = 'D';
	else if(scoreInput[1] < 60)
		scoreInput[1] = 'F';

	if(scoreInput[2] <= 100)
		scoreInput[2] = 'A';
	else if(scoreInput[2] < 90)
		scoreInput[2] = 'B';
	else if(scoreInput[2] < 80)
		scoreInput[2] = 'C';
	else if(scoreInput[2] < 70)
		scoreInput[2] = 'D';
	else if(scoreInput[2] < 60)
		scoreInput[2] = 'F';

	if(scoreInput[3] <= 100)
		scoreInput[3] = 'A';
	else if(scoreInput[2] < 90)
		scoreInput[3] = 'B';
	else if(scoreInput[2] < 80)
		scoreInput[3] = 'C';
	else if(scoreInput[2] < 70)
		scoreInput[3] = 'D';
	else if(scoreInput[2] < 60)
		scoreInput[3] = 'F';

	if(scoreInput[4] <= 100)
		scoreInput[4] = 'A';
	else if(scoreInput[2] < 90)
		scoreInput[4] = 'B';
	else if(scoreInput[2] < 80)
		scoreInput[4] = 'C';
	else if(scoreInput[2] < 70)
		scoreInput[4] = 'D';
	else if(scoreInput[2] < 60)
		scoreInput[4] = 'F';

	char letterGrade[][6] = {'A', 'B', 'C', 'D', 'F'};

	return letterGradesA(scoreInput, letterDefined);

}

[jimblumberg]

First main can only be defined as int main(), or int main(int argc, char **argv). Not int main (char LetterDefined).


Now after you fix that what exactly don't you understand about question 4?

Quote

4. Calculate each student letter grade using a function, save the letter grade to another array defined in main function.

Have you learned about loops yet? If so you may want to consider a loop in your letterGradesA() function. And you should not be calling this function in your return statement.

I suggest you study the links provided in my signature, they should help you with using functions.

Jim

[alexb9054]

I didn't think of using loops. Thanks