variable is used without being initialized

[xsxsux]

when I debug this in my MS Visual Studio, I get a message saying variable is used without being initialized, could any1 take a look at what's wrong with my code?

#include<iostream>
#include<conio.h>

using namespace std;

void DisplayHeading();
void GetScore (int);
void DetermineGrade (int,char);
void DisplayGrade (int,char);
void GetResponse(char);

int main()
{
        int Score;
	char Response, Grade;
	
	DisplayHeading();

	do
	{
		GetScore(Score);
	
		DetermineGrade(Score, Grade);
	
		DisplayGrade(Score, Grade);
		
		GetResponse(Response);

	} while (Response == 'y' || Response == 'Y');

	_getch();

	return 0;
}
//----------------------------------------------

void DisplayHeading()
{
	cout << "Grade Calcuator" << endl;
}

//-----------------------------------------------

void GetScore (int score)
{
	cout << "Enter your score between 0 and 100 inclusive: ";
	cin >> score;

	while (score > 100 || score < 0)
	{
		cout << "Invalid Score! " << endl;
		cout << "Enter a score between 0 and 100 inclusive: ";
		cin >> score;
	}
}

//-------------------------------------------------------

void DetermineGrade (int score, char grade)
{
	if (score >= 85)
	grade == 'A';
	
	else if (score >= 70)
	grade == 'B';
	
	else if (score >= 60)
	grade == 'C';

	else if (score >= 50)
	grade == 'D';

	else
	grade == 'F';
}

//---------------------------------------------

void DisplayGrade(int score, char grade)
{
	cout << "The score is " << score << endl;
	cout << "The Grade is " << grade << endl;
}

//------------------------------------------------
void GetResponse (char response)
{
	cout << "Do you want to calculate another grade? (Y/N)";
	cin >> response;

	do
	{
		cout << "Invalid response!" << endl;
		cout << "Please enter a valid response: ";
		cin >> response;
	} while (response != 'Y' || response != 'y' || response != 'N' || response != 'n');
}

[LendraDwi]

The reason is the value that you input from the functiion is not returning back to main
Use reference or pointer parameter in getscore and determinegrade

[xsxsux]

Thank you very much, this problem has been solved... but another problem occurred...

my program keeps outputting

"Invalid response!"
"Please enter a valid response:

no matter what letter I enter, and the program won't go back to the beginning after calculate one grade at the first time

[LendraDwi]

Try to use && instead of ||

[danghotties]

#include<iostream>
#include<conio.h>

using namespace std;

void DisplayHeading()
{
	cout << "Grade Calcuator" << endl;
}

//-----------------------------------------------

int GetScore()
{
	int score;

	cout << "Enter your score between 0 and 100 inclusive: ";
	cin >> score;

	while (score > 100 || score < 0)
	{
		cout << "Invalid Score! " << endl;
		cout << "Enter a score between 0 and 100 inclusive: ";
		cin >> score;
	}
	return score;
}

//-------------------------------------------------------

char DetermineGrade(int score)
{
	char grade;

	if (score >= 85)
		grade = 'A';

	else if (score >= 70)
		grade = 'B';

	else if (score >= 60)
		grade = 'C';

	else if (score >= 50)
		grade = 'D';
	else
		grade = 'F';

	return grade;
}

//---------------------------------------------

void DisplayGrade(int score, char grade)
{
	cout << "The score is " << score << endl;
	cout << "The Grade is " << grade << endl;
}

//------------------------------------------------
char GetResponse()
{
	char response;

	Beginning:
	cout << "Do you want to calculate another grade? (Y/N) ";
	cin >> response;
	if (response == 'y' || response == 'Y' || response == 'n' || response == 'N')
		return response;
	else
	{
		cout << "Invalid response." << endl;
		goto Beginning;
	}
}


int main()
{
	int Score = 0;
	char Response = 0 , Grade = 0;
	
	DisplayHeading();

	do
	{
		Score = GetScore();
	
		Grade = DetermineGrade(Score);
	
		DisplayGrade(Score, Grade);
		
		Response = GetResponse();

	} while (Response == 'y' || Response == 'Y');

	_getch();

	return 0;
}

Here try this.

[xsxsux]

OMG!! Thank you very much! It works perfectly :D:D:D