UndeclaredIdentifier

[hashly]

Hello, im trying to compile this code but it keeps failing due to the Y being an undeclared identifier even though i declare answer as a local variable:

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

int main()
{
	// Local Variables
	char answer;
	float numberOfPrices;
	float sumInEuros;

	//Prototypes
	void processAPrice( float);
	void produceFinalData();

	numberOfPrices = 0;
	sumInEuros = 0;
	answer = Y;
	
	while ( answer = Y)
	{
		processAPrice( numberOfPrices);
		numberOfPrices = ++numberOfPrices;
		cout << "\nContinue (Y/N)?";
		cin >> ( answer);
	}
	
	if (numberOfPrices > 0)
	{
		produceFinalData();
	}			 

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

What am i doing wrong?

[cire]

im trying to compile this code but it keeps failing due to the Y being an undeclared identifier even though i declare answer as a local variable:

What does the declaration of answer have to do with Y being an undeclared identifier?

I believe you wanted to use 'Y' and probably == rather than =

[hashly]

Im trying to assign the variable 'answer' to Y, why would i want to use the equality operator?

[BigBlackSheep]

answer = Y; //Use 'Y' here, not Y. Y would refer to a variable called Y. 'Y' is a char.
	
	while ( answer = Y) //This is always true. (If you change it to 'Y'). The = operator
//returns the value assigned, and anything non-zero is considered true.
//So cire is right, you need ==.
	{
		processAPrice( numberOfPrices);
		numberOfPrices = ++numberOfPrices;
		cout << "\nContinue (Y/N)?";
		cin >> ( answer);
	}

[hashly]

Ahhhhhhh right, a bit of a "duh" moment...
Thanks for that.

With that small blip out of the way, could either of you tell me why its not compiling still. Heres the full program:

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

int main()
{
	// Local Variables
	char answer;
	float numberOfPrices;
	float sumInEuros;

	//Prototypes
	void processAPrice( float);
	void produceFinalData();

	numberOfPrices = 0;
	sumInEuros = 0;
	answer = 'Y';
	
	while ( answer == 'Y')
	{
		processAPrice( numberOfPrices);
		numberOfPrices = ++numberOfPrices;
		cout << "\nContinue (Y/N)?";
		cin >> ( answer);
	}
	
	if (numberOfPrices > 0)
	{
		produceFinalData();
	}			 

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

void processAPrice()
{
	//Local Variables
	float priceInPounds;
	float priceInEuros;
	float sumInEuros;
	float numberOfPrices;

	//Prototypes
	void getPriceInPounds( float&);
	void convertPriceIntoEuros( float, float&);
	void showPriceInEuros( float, float);
	void calculateSum( float, float&);
	void produceFinalData( float, float);

	//Calls
	getPriceInPounds( priceInPounds);
	convertPriceIntoEuros( priceInPounds, priceInEuros);
	showPriceInEuros( priceInPounds, priceInEuros);
	calculateSum( priceInEuros, sumInEuros );
	produceFinalData( numberOfPrices, sumInEuros );

	return;
}

	void getPriceInPounds( float& priceInPounds)
	{
		assert( priceInPounds >= 0);	
		cout << ("\nEnter a price (in pounds): ");
		cin >> priceInPounds;
	}


	void convertPriceIntoEuros( float priceInPounds, float& priceInEuros )
	{
		assert((priceInPounds >= 0) && ( priceInEuros >= 0));
		float conversionRate = 0.82f;
		priceInEuros = ( priceInPounds / conversionRate);
	}


	void showPriceInEuros( float priceInPounds, float priceInEuros )
	{
		assert((priceInPounds >= 0) && ( priceInEuros >= 0));
		cout << "\nThe euro value of £" << priceInPounds << "is \u20AC" << priceInEuros;
	}


	void calculateSum( float priceInEuros, float& sumInEuros)
	{
		assert( sumInEuros >= 0);
		sumInEuros =  (sumInEuros + priceInEuros);
	}


	void produceFinalData( float numberOfPrices, float sumInEuros )
	{
		assert((numberOfPrices >= 0) && ( sumInEuros >= 0));
		cout << "The total sum is: " << sumInEuros << "Euros";
		cout << "The average is: " << sumInEuros / numberOfPrices;
	}

and heres the error i get:

1>Task4Wed.obj : error LNK2019: unresolved external symbol "void __cdecl produceFinalData(void)" (?produceFinalData@@YAXXZ) referenced in function _main
1>Task4Wed.obj : error LNK2019: unresolved external symbol "void __cdecl processAPrice(float)" (?processAPrice@@YAXM@Z) referenced in function _main
1>E:\Uni Work\Fundamentals of Programming Work\TestProject\Debug\TestProject.exe : fatal error LNK1120: 2 unresolved externals

[Alrededor]

When the compiler encounters the two function calls in main() it hasn't yet seen their definitions. You need to add forward declarations for the functions before main().

Also, you need to move the function prototypes in processAPrice() out of the function and before main().

void processAPrice();
void produceFinalData( float numberOfPrices, float sumInEuros );

void getPriceInPounds( float&);
void convertPriceIntoEuros( float, float&);
void showPriceInEuros( float, float);
void calculateSum( float, float&);
void produceFinalData( float, float);

int main()
{
   ...
}

I haven't looked for other errors.