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not clear on the refrenced parameters

jayadelgado (15)
so far on my code i have the code for distance, slope, intercept , and line equation. i have to do a similar thing with intersection but the reference parameters are confusing me


my code so far
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#include <iostream>
#include <iomanip>
#include <sstream>
#include <cmath>
#include "geometry.h"

using std::string;
using std::ostringstream;
using std::setprecision;

static ostringstream oss;

string print_point(double x, double y)
{
	oss << setprecision(2);
	oss.str("");  //  Clear the output string
	oss << "(" << x << "," << y << ")";
	return oss.str();
}

double distance(double x1, double y1, double x2, double y2)
{
    double x=x2-x1;
	double y=y2-y1;
	y=pow(y,2);
	x=pow(x,2);
	double d = sqrt(x+y);
	if ((x+y)<0)
	{
		oss << "distance has imaginary numbers.";
	}
	else
	{
		double d = sqrt(x+y);

	}
	return d;
   
}

bool equals(double a, double b)
{
	return a == b || fabs(a - b) < 0.0001;
}

double slope(double x1, double y1, double x2, double y2)
{
    double x=x2-x1;
	double y=y2-y1;
	double m =y/x;
	if (x=0)
	{
		m=HUGE_VAL;
	}

	return m;
   
}

double intercept(double x1, double y1, double x2, double y2)
{
   double x=x2-x1;
	double y=y2-y1;
	double m =y/x;
	if (x==0)
	{
		m=HUGE_VAL;
		double b=x1;
	}
	else
		m=m*x1;
	double b = y1-m;
	return b;
}

string line_equation(double m, double b)
{
	oss.str("");  //  Clear the output string

	oss << setprecision(2);


	if (m==1 || m==-1 || m==0 || m==HUGE_VAL)
	{
		if (m==1)	
		{
			if (b==0)
			{
				oss <<  "y =  x ";
			}
			else
				if (b < 0)
					oss <<  "y =  x - " << b*-1 ;

				else 
					oss << "y = x + " << b;
		}
		if (m==-1)
		{	
			if (b==0)
			{
				oss <<  "y =  x ";
			}
			else
				if (b < 0)
					oss <<  "y =  -x - " << b*-1;

				else 
					oss << "y = -x + " << b ;
		}
		if (m==0)
		{
			if (b==0)
			{
				oss <<  "y = 0" ;
			}
			else
				if (b < 0)
					oss << "y = - " << b*-1 ;
				else
					oss<< " y = " << b;
		}
		if (m==HUGE_VAL)
		{
			if (b=0)
				oss << "x = 0";
			else 
				if (b>0)
					oss << " x = - " << b*-1;
				else
					oss << "x = " << b;
		}
	}
	else 
	{	
		if (b==0)
			oss <<  "y =  x ";
		else
			if (b < 0)
				oss << "y = " << m <<  "x - " << b*-1 ;
			else 
				oss << "y = " << m << "x + " << b ;
	}


	return oss.str();
}

string line_equation(double x1, double y1, double x2, double y2)
{
	return line_equation(slope(x1, y1, x2, y2), intercept(x1, y1, x2, y2));
}

void intersection(double m1, double b1, double m2, double b2, 
                  double& i_x, double& i_y)
{
   
}


sorry its kinda long
Need4Sleep (570)
What exactly do you not understand? The function takes 6 parameters, the first 4 are used to find the intersection, and next two hold the coordinates of the intersection you found.

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//main file
intersection(Var1,Var2,Var3,Var4,x_int,y_int)
//var 1-4 are values you determined earlier in the function, x_int and y_int
//hold the values that the function computes


so instead of returning values int the function....

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void intersection(double m1, double b1, double m2, double b2, 
                  double& i_x, double& i_y)
{
   int x_cord, y_cord;
   //do stuff....
   i_x = x_cord; //simply set the reference values
   i_y = y_cord;
}
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