6.3.2 有返回值的函数-值是如何被返回的

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书中页数：P172
代码名称：make_plural.h make_plural.cc

//make_plural.h
#include <cstddef>
using std::size_t;

#include <string>
using std::string;

#include <iostream>
using std::cout; using std::endl;

#ifndef MAKE_PLURAL_H
#define MAKE_PLURAL_H

// return the plural version of word if ctr is greater than 1
inline
string make_plural(size_t ctr, const string &word, 
                               const string &ending)
{
	return (ctr > 1) ? word + ending : word;
}

#endif

#include <cstddef>
using std::size_t;

#include <string>
using std::string;

#include <iostream>
using std::cout; using std::endl;

#include "make_plural.h"

int main()
{
	size_t cnt = 1;
	cout << make_plural(cnt, "success", "es") << endl;

	cnt = 2;
	cout << make_plural(cnt, "failure", "s") << endl;

	return 0;
}