Chapter 8 // Exercise 12 - Principles & Practice Using C++

In this exercise I am using Visual Studio Community 2017 and the header file "std_lib_facilities.h" which can be found here:

http://www.stroustrup.com/Programming/PPP2code/std_lib_facilities.h

Chapter 8 // Exercise 12

12. Improve print_until_s() from section 8.5.2. Test it. What makes a good set of test cases? Give reasons. Then, write a print_until_ss() that prints until it sees a second occurrence of its quit argument.

#include "stdafx.h"
#include "std_lib_facilities.h"

void print_until_s(const vector<string> &v, string quit)
{
 //for every 's' in 'v'
 for (string s : v)
 {
  if (s == quit)
   return;

  cout << s << " ";
 }
}

int main()
{
 vector<string> words = { "this", "is", "the", "ultimate", "showdown", "of", "ultimate", "destiny",
 "good", "guys", "bad", "guys", "and", "explosions", "as", "far", "as", "the", "eye", "can", "see" };

 print_until_s(words, "and");

 cout << '\n' << endl;

 keep_window_open();

 return 0;
}

I made the vector a const pointer as we aren't modifying any values and generally formatted it to a style that I prefer (it really annoys me when the bracket starts on the same line as the argument). As for testing, this works quite well but stops at the first instance of the word, which is a given. It also prints the entire vector if no quit word is found.

#include "stdafx.h"
#include "std_lib_facilities.h"

void print_until_ss(const vector<string> &v, string quit)
{
 int quitFound = 0;

 //for every 's' in 'v'
 for (string s : v)
 {
  if (s == quit)
   ++quitFound;
  else if (quitFound == 2)
   return;

  cout << s << " ";
 }
}

int main()
{
 vector<string> words = { "this", "is", "the", "ultimate", "showdown", "of", "ultimate", "destiny",
 "good", "guys", "bad", "guys", "and", "explosions", "as", "far", "as", "the", "eye", "can", "see" };

 print_until_ss(words, "ultimate");

 cout << '\n' << endl;

 keep_window_open();

 return 0;
}