Program Eror!

I have this error in visual studio, and i dont know what does mean
Link for picture for the error https://ibb.co/FswnRmj

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#include <ostream>
#include <string>
#include <istream>
class Stock {
	
	int code;
	std::string name;
	double valuePerUnit;
	int noUnits;
public:
	Stock();
		
	Stock(int c, std::string n, double v, int nu);
		
	void setCode(int c);
		
	void setName(std::string n);
		
	void setValuePerUnit(double v);
		
	void setNoUnits(int n);
		
	int getCode();
		
	std::string getName();
		
	double getValuePerUnit();
		
	double getNoUnits();
		
	double calcAmount();

	friend std::ostream & operator<<(std::ostream &out, const Stock &s);
		
	friend std::istream &operator>>(std::istream &in, Stock& s);


};


#include "Stock.h"
#include <iostream>

Stock::Stock() {
	code = 0;
	name = "";
	valuePerUnit = 1;
	noUnits = 1;
}
Stock::Stock(int c, std::string n, double v, int nu)
{
	code = c;
	name = n;
	valuePerUnit = v;
	noUnits = nu;
}

void Stock::setCode(int c)
{
	code = c;
}

void Stock::setName(std::string n)
{
	name = n;
}

void Stock::setValuePerUnit(double v)
{
	valuePerUnit = v;
}

void Stock::setNoUnits(int n)
{
	noUnits = n;
}

int Stock::getCode()
{
	return code;
}

std::string Stock::getName()
{
	return name;
}

double Stock::getValuePerUnit()
{
	return valuePerUnit;;
}

double Stock::getNoUnits()
{
	return noUnits;;
}

double Stock::calcAmount()
{
	return getNoUnits() * getValuePerUnit();
}

std::ostream& operator << (std::ostream &out,  Stock &s)
{
	out << "\nCode : " << s.getCode();
	out << "\nName : " << s.getName();
	out << "\nNumber Of Units : " << s.getNoUnits();
	out << "\nCost of Unit : " << s.getValuePerUnit();
	out << "\nTotal : " << s.calcAmount() << std::endl;
	
	return out;
}

std::istream& operator >> (std::istream& in, Stock& s)
{
	std::cout<<"Enter Stock Code ";
	in>>s.code;
	
	std::cout<<"Enter Stock Name ";
	in>>s.name;
	
	std::cout<<"Enter value per Unit : ";
	in>>s.valuePerUnit;

	std::cout<<"Enter Number of Units : ";
	in>>s.noUnits;
	
	return in;
}





Last edited on
This is your friend declaration:
friend std::ostream & operator<<(std::ostream &out, const Stock &s);

This is your implementation of said function:
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std::ostream& operator << (std::ostream &out,  Stock &s)
{
	...
}

Notice, your implementation's function signature is not const-correct, but your declaration is (const Stock &s vs. Stock &s).

Every member function that does not modify data should have a const qualifier on it.

So, for example, it should be
int getCode() const;

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int Stock::getCode() const
{
    return code;
}


Do this for all your get* functions, and calcAmount.
Last edited on
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