How to sort an object array - c++

Question

I've created a class called Box that is pretty much what it sounds like. I want to sort these box objects, and I have created a function to do so.
void boxSort(Box array[], int size) {
Box temp;
bool swap;
do {
swap = false;
for(int count=0; count<(size-1); count++) {
int volume1 = array[count].getVolume(array[count].height, array[count].width, array[count].length);
int volume2 = array[count+1].getVolume(array[count+1].height, array[count+1].width, array[count+1].length);
if(volume1 > volume2) {
temp = array[count];
array[count] = array[count+1];
array[count+1] = temp;
swap = true;
}
}
}
while(swap);
}
This function sorts an array of objects of class Box.
Box class:
class Box {
public:
double height, width, length;
double getVolume(double, double, double);
double getSurfaceArea(double, double, double);
void setHeight(double);
void setWidth(double);
void setLength(double);
Box() {
height = width = length = 1;
}
Box(double h, double w, double l) {
setHeight(h);
setWidth(w);
setLength(l);
}
};
#endif
void Box::setHeight(double h) {
height = h;
}
void Box::setWidth(double w) {
width = w;
}
void Box::setLength(double l) {
length = l;
}
double Box::getVolume(double h, double w, double l) {
double volume = h*w*l;
return volume;
}
double Box::getSurfaceArea(double h, double w, double l) {
double surfaceArea = (h*w)*2 + (h*l)*2 + (l*w)*2;
return surfaceArea;
}
When I run this program I get an error:
linker command failed with exit code 1
This doesn't shown up on any particular line, and I have no idea what it means, so I'm a little lost on how to debug this.

Answer 1

The linker errors are reported if you have any problem with libraries or object files linked. Were you able to successfully build the executable?

Answer 2

I think this error is occurring due to more than one main() function in your code.You can have only one main() function.

Answer 3

Not sure about the error. But I would suggest changing boxSort function to something like this.
change getVolume to this
double Box::getVolume() {
return height*width*length;
}
and boxSort to this
void boxSort(std::array<Box, 3> boxes)
{
struct
{
bool operator()(Box x, Box y)
{
return x.getVolume() < y.getVolume();
}
}compFunc;
std::sort(boxes.begin(), boxes.end(), compFunc);
for(Box a: boxes)
{
std::cout<<a.getVolume()<<" ";
}
}
function call:
std::array<Box,3> boxes = {box1, box2, box3};
boxSort(boxes);