C++ Help

Richie77

My assignment is to convert cartesian points to polar. I was wondering if someone can help me with my errors.
this is how far i have gotten.
class declaration file
class VecC2
{
public:
double x;
double y;
};
class VecP2
{
public:
double phi;
double r;
};
VecP2 Polar2(VecC2);
class implementation file
VecP2 Polar2(VecC2 vc)
{

VecP2 polar;
polar.phi = atan(vc.y/vc.x);
polar.r = sqrt(vc.x*vc.x+vc.y*vc.y);
return(polar);
}
Main.cpp : implementation file
int i;
int numdata = 0;
VecC2 vc[10];
for(i = 0;i < 10 && !inFile.eof(); i++)
{
inFile >> vc.x >> vc.y;
}

for(i = 0;i < numdata; i++)
{
VecP2 polar;

outFile << "Element " << i << " = "<< vc.x << " " << vc.y << endl;
outFile << "Polar Conversion" << polar.r << " " << polar.phi << endl;
}

Richie77

i can also post the whole files if it'll help the posted coding is just parts i am having problems with.

shwaip

1) What errors ore you getting?

2) post code inside [php]

[/php] tags to aid in readability.

a2jfreak

You don't understand the math or don't know how to convert the math to C++?

If it's the math, read this.

If it's the C++, look up math functions. tan(), sin(), etc.

If you have any problems after reading that page and looking up the related functions, post back and someone will gladly assist you.

Richie77

The math coding is correct im just having problems returning values to the outfile its telling me i have an uninitialized variable 'polar' in my main. Ive tried reading back but i still am having no luck.

shwaip

VecP2 polar;

outFile << "Element " << i << " = "<< vc.x << " " << vc.y << endl;
outFile << "Polar Conversion" << polar.r << " " << polar.phi << endl;

You never change what polar is. I assume that you wanted to call polar = Polar2(vc); at some point