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How do you round up or down a double(not an int) to the nearest dollar? Ex. $23.45 = $23 or $25.54 = $26...etc

I'm new with C++ so no flame. I'm getting this error

[Linker error] undefined reference to `DetermineCost(double, double)'
ld returned 1 exit status

Here is my code



#include...

Im sure i need apstring in there somewhere

Complete list of errors are:

13:22: apstring.h: No such file or directory
18: error: expected `,' or `...' before '&' token
18: error: ISO C++...

#include <iostream>
#include <iomanip>
#include "apstring.h"

using namespace std;

void ExplainProgram();
int getInteger(const apstring &prompt);
double getDouble(const apstring &prompt);...

This is my program

#include <iostream>
#include <iomanip>
#include "apstring.h"

using namespace std;

void ExplainProgram();
int getInteger(const apstring &prompt);