Ошибка c4716 должна возвращать значение

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//************************************
//* This program calculates the area 
//* of a rectangle.
//************************************
#include <iostream>
using namespace std;

double getLength();
double getWidth();
double getArea(double, double);
double displayData (double, double, double);

int main ()
{

	double rect_length,
           rect_width,
		   rect_area;
		   

	
	rect_length= getLength();
	rect_width= getWidth();
	
	rect_area=getArea(rect_length, rect_width);



return 0;
}

// ****************************************
//*THIS IS THE FUNCTION FOR GETTING THE 
//*RECTANGLE LENGTH
//*****************************************

double getLength(double)
{
	double length;

	cout << "Please enter the length of the rectangle: ";
	cin >> length;
	return length;

}

// ****************************************
//*THIS IS THE FUNCTION FOR GETTING THE 
//*RECTANGLE WIDTH
//*****************************************

double getWidth(double)
{
	double width;
	
	cout << "Please enter the width of the rectancle: ";
	cin >> width;
	return width;
}

// ****************************************
//* THIS FUNCTION TAKES THE RECTANGLE WIDTH
//* AND LENGTH AND MULTIPLIES THEM TO GIVE 
//* US THE RECTANGLES AREA.
//*****************************************

double getArea(double num1, double num2)
{ 
	return num1*num2;
	
}


// ****************************************
//* THIS FUNCTION ACCEPTS THE RECTANGLES 
//* LENGTH, WIDTH, AND AREA AND DIPLAYS 
//* THEM ON THE SCREEN. 
//*****************************************

double displayData(double rect_length, double rect_width, double rect_area)
{ 
	cout << "The length of the rectangle is " << rect_length << ". " << endl;
	cout << "The width of the rectangle is " << rect_width << ". " << endl;
	cout << "The area of the rectangle is " << rect_area << ". " << endl;
	
	
}

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void displayData(double rect_length, double rect_width, double rect_area)
{ 
    cout << "The length of the rectangle is " << rect_length << ". " << endl;
    cout << "The width of the rectangle is " << rect_width << ". " << endl;
    cout << "The area of the rectangle is " << rect_area << ". " << endl;
    
    
}

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double displayData(double rect_length, double rect_width, double rect_area)
{ 
    cout << "The length of the rectangle is " << rect_length << ". " << endl;
    cout << "The width of the rectangle is " << rect_width << ". " << endl;
    cout << "The area of the rectangle is " << rect_area << ". " << endl;
    
    return 0.0
}

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#include <iostream>
using namespace std;

double getLength();
double getWidth();
double getArea(double, double);
void displayData (double, double, double);

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void displayData(double rect_length, double rect_width, double rect_area)
{ 
    cout << "The length of the rectangle is " << rect_length << ". " << endl;
    cout << "The width of the rectangle is " << rect_width << ". " << endl;
    cout << "The area of the rectangle is " << rect_area << ". " << endl;
    
    
}

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double displayData(double rect_length, double rect_width, double rect_area)
{ 
    cout << "The length of the rectangle is " << rect_length << ". " << endl;
    cout << "The width of the rectangle is " << rect_width << ". " << endl;
    cout << "The area of the rectangle is " << rect_area << ". " << endl;
    
    return 0.0
}