Here is my program...The compiler error will be posted at the end. I am trying t

Question

Here is my program...The compiler error will be posted at the end. I am trying to get this to print the angle between a set of coordinates and i think maybe the issue is with calling a function from within a function, but I am not sure and I've tried unsuccessfully. Any ideas on how I can get this to work?




--------------------------------------- This program reads in the coordinates of two 2D vectors
and outputs the angle between the vectors in degrees.-------------------------------------------------------------------------------------


#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

--------------------------------------------------------------------function prototypes---------------------------------------------------------------------

// ENTER FUNCTION PROTOTYPE FOR normalize() HERE.
double normalize(double &x, double &y);
// ENTER FUNCTION PROTOTYPE FOR dot_product() HERE.
double dot_product(double x1, double x2, double y1, double y2);
// ENTER FUNCTION PROTOTYPE FOR compute_vector_angle() HERE.
double compute_vector_angle(double x1, double x2, double y1, double y2);
// ENTER FUNCTION PROTOTYPE FOR radians2degrees() HERE.
double radians2degrees(double numRad);
// ENTER FUNCTION PROTOTYPE FOR output_angle() HERE.
void output_angle(double x1, double x2, double y1, double y2, double numDeg);


--------------------------------------------------------------------------//MAIN---------------------------------------------------------------------------------


int main()
{
double u1, v1; // coordinates of vector 1
double u2, v2; // coordinates of vector 2
double radians; // angle in radians
double degrees; // angle in degrees

// Read points
cout << "Enter first vector (2 floats): ";
cin >> u1 >> v1;
cout << "Enter second vector (2 floats): ";
cin >> u2 >> v2;

// compute angle in radians between (u1, v1) and (u2, v2)
radians = compute_vector_angle(u1, v1, u2, v2);

// convert radians to degrees
degrees = radians2degrees(radians);

// output angle
output_angle(u1, v1, u2, v2, degrees);

return(0);
}
------------------------------------------------------------FUNCTION DEFINITIONS----------------------------------------------------------------------
// DEFINE FUNCTION normalize() HERE.
double normalize(double &x, double &y)
{

if (sqrt(pow(x,2)+pow(x,2))==0)
{
x=0;
y=0;
}
else
{
x=(x/sqrt(pow(x,2)+pow(x,2)));
y=(y/sqrt(pow(x,2)+pow(x,2)));
}
}

// DEFINE FUNCTION dot_product() HERE.
double dot_product(double x1, double x2, double y1, double y2)
{

double u1, v1;
u1=x1;
v1=y1;
double u2, v2;
u2=x2;
v2=y2;
double dot_pcalc;
dot_pcalc=x1*x2+y1*y2;
return(dot_pcalc);
}
// DEFINE FUNCTION compute_vector_angle() HERE.
double compute_vector_angle(double x1, double x2, double y1, double y2)
{
double x;
double y;
x=normalize(x1, y1);
y=normalize(x2, y2);
double product;
product=dot_product(x1, x2, y1, y2);
double angle;
angle=acos(product);
return(angle);
}

// DEFINE FUNCTION radians2degrees() HERE.
double radians2degrees(double numRad)
{

compute_vector_angle(numRad);
double numDeg;
numDeg=180*(numRad/M_PI);
return(numDeg);
}

// DEFINE FUNCTION output_angle() HERE.
void output_angle(double x1, double x2, double y1, double y2, double numDeg)
{
radians2degrees(numDeg);
cout<<"Angle between vectors x1,y1 and x2,y2 is "<<numDeg<<" degrees "<<endl;
}



---------------------------------------------------------ERRORS--------------------------------------------------------------------------

vector2D_angle.cpp: In function

Explanation / Answer

There are multiple errors in program you wrote. In Normalize function actually return type is Double but you are not returning anything inside function and i think the logic what you wrote for normalize function is totally wrong. In some functions you are calling functions but you are not assigning returned values to some variables.

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