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k-mad's solution

to Bob in the C++ Track

Published at Jul 13 2018 · 1 comment
Instructions
Test suite
Solution

Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Bob answers 'Sure.' if you ask him a question.

He answers 'Whoa, chill out!' if you yell at him.

He says 'Fine. Be that way!' if you address him without actually saying anything.

He answers 'Whatever.' to anything else.

Getting Started

Make sure you have read the C++ page on exercism.io. This covers the basic information on setting up the development environment expected by the exercises.

Passing the Tests

Get the first test compiling, linking and passing by following the three rules of test-driven development. Create just enough structure by declaring namespaces, functions, classes, etc., to satisfy any compiler errors and get the test to fail. Then write just enough code to get the test to pass. Once you've done that, uncomment the next test by moving the following line past the next test.

#if defined(EXERCISM_RUN_ALL_TESTS)

This may result in compile errors as new constructs may be invoked that you haven't yet declared or defined. Again, fix the compile errors minimally to get a failing test, then change the code minimally to pass the test, refactor your implementation for readability and expressiveness and then go on to the next test.

Try to use standard C++11 facilities in preference to writing your own low-level algorithms or facilities by hand. CppReference is a wiki reference to the C++ language and standard library. If you are new to C++, but have programmed in C, beware of C traps and pitfalls.

Source

Inspired by the 'Deaf Grandma' exercise in Chris Pine's Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=06

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

bob_test.cpp

#include "bob.h"
#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_CASE(stating_something)
{
    BOOST_REQUIRE_EQUAL("Whatever.", bob::hey("Tom-ay-to, tom-aaaah-to."));
}

#if defined(EXERCISM_RUN_ALL_TESTS)
BOOST_AUTO_TEST_CASE(shouting)
{
    BOOST_REQUIRE_EQUAL("Whoa, chill out!", bob::hey("WATCH OUT!"));
}

BOOST_AUTO_TEST_CASE(asking_a_question)
{
    BOOST_REQUIRE_EQUAL("Sure.", bob::hey("Does this cryogenic chamber make me look fat?"));
}

BOOST_AUTO_TEST_CASE(talking_forcefully)
{
    BOOST_REQUIRE_EQUAL("Whatever.", bob::hey("Let's go make out behind the gym!"));
}

BOOST_AUTO_TEST_CASE(using_acronyms_in_regular_speech)
{
    BOOST_REQUIRE_EQUAL("Whatever.", bob::hey("It's OK if you don't want to go to the DMV."));
}

BOOST_AUTO_TEST_CASE(forceful_questions)
{
    BOOST_REQUIRE_EQUAL("Whoa, chill out!", bob::hey("WHAT THE HELL WERE YOU THINKING?"));
}

BOOST_AUTO_TEST_CASE(shouting_numbers)
{
    BOOST_REQUIRE_EQUAL("Whoa, chill out!", bob::hey("1, 2, 3 GO!"));
}

BOOST_AUTO_TEST_CASE(only_numbers)
{
    BOOST_REQUIRE_EQUAL("Whatever.", bob::hey("1, 2, 3"));
}

BOOST_AUTO_TEST_CASE(question_with_only_numbers)
{
    BOOST_REQUIRE_EQUAL("Sure.", bob::hey("4?"));
}

BOOST_AUTO_TEST_CASE(shouting_with_special_characters)
{
    BOOST_REQUIRE_EQUAL("Whoa, chill out!", bob::hey("ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!"));
}

BOOST_AUTO_TEST_CASE(shouting_with_no_exclamation_mark)
{
    BOOST_REQUIRE_EQUAL("Whoa, chill out!", bob::hey("I HATE YOU"));
}

BOOST_AUTO_TEST_CASE(statement_containing_question_mark)
{
    BOOST_REQUIRE_EQUAL("Whatever.", bob::hey("Ending with a ? means a question."));
}

BOOST_AUTO_TEST_CASE(prattling_on)
{
    BOOST_REQUIRE_EQUAL("Sure.", bob::hey("Wait! Hang on.  Are you going to be OK?"));
}

BOOST_AUTO_TEST_CASE(question_with_trailing_whitespace)
{
    BOOST_REQUIRE_EQUAL("Sure.", bob::hey("Are you ok? "));
}

BOOST_AUTO_TEST_CASE(silence)
{
    BOOST_REQUIRE_EQUAL("Fine. Be that way!", bob::hey(""));
}

BOOST_AUTO_TEST_CASE(prolonged_silence)
{
    BOOST_REQUIRE_EQUAL("Fine. Be that way!", bob::hey("   "));
}

BOOST_AUTO_TEST_CASE(not_all_silence)                                                                         
{                                                                                                             
	BOOST_REQUIRE_EQUAL("Whatever.", bob::hey(" A bit of silence can be nice.  "));                           
}
#endif
/*******************************************************************************
 * k-mad
 * 9.24.14
 * bob.h
 ******************************************************************************/

#ifndef BOB_H
#define BOB_H

#include <cctype>
#include <iostream>
#include <string>
#include <sstream>

using namespace std;

namespace bob {
  string hey(const string &statement);
  static bool saysNothing(const string &statement);
  static bool questioning(const string &statement);
  static bool yelling(const string &statement);
};

string bob::hey(const string &statement) {
  // Yelling must be checked before questioning.
  if (saysNothing(statement))       { return "Fine. Be that way!"; }
  else if (yelling(statement))      { return "Woah, chill out!"; }
  else if (questioning(statement))  { return "Sure."; }
  return "Whatever.";
}

static bool bob::saysNothing(const string &statement) {
  // A statement saysNothing if it is empty or only has white space.
  stringstream ss;
  ss << statement;
  string noWhiteSpace;
  ss >> ws >> noWhiteSpace;
  return noWhiteSpace.empty();
}

static bool bob::questioning(const string &statement) {
  // A statment is questioning if it ends with a question mark.
  return statement.size() > 0 && statement.back() == '?';
}

static bool bob::yelling(const string &statement) {
  // A statement is yelling if it has alphabetic letters and all the letters are caps.
  bool alpha_found = false;
  for (char c : statement) {
    if (isalpha(c)) {
      alpha_found = true;
      if (not isupper(c)) {
        return false;
      }
    }
  }
  // If we got to this point, either no alpha letters were found or all caps.
  return alpha_found;
}

#endif// BOB.H

Community comments

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Avatar of absurdist

hello k-mad.

it looks like your yelling() method almost solves the whole problem.

if you get to

line 58 return alpha_found,

you know that it is either yelling, or all white space, if you could just change the return type of this method, you wouldn't need the saysNothing() method anymore.

What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

  • What compromises have been made?
  • Are there new concepts here that you could read more about to improve your understanding?