Exercise 5-9

Write a program to write the words in the input that do not contain any uppercase letters followed by words that contain one or more uppercase letters.

Solution

To clarify, the objective of this exercise is to:

• read in a list of words
• print the words that are all pure lower case.
• print the words that contain at least one upper case letter.

To do this, we will need to:

1. Use the usual while/cin/push_back method to read in a list of words.
2. Create a function hasUpcaseLetters to determine whether a word contains any upper case letters at all.
3. If word contains no upper case letters, append to vector<string> allLowcaseLetterWords.
4. Otherwise if word contains at least one upper case letters, append to vector<string> someUpcaseLetterWords.
5. (Optional) re-use the home-made function vcout to print the two word lists to the console output.

The Project

These are the files that I use. The main program should sum up the logic job flow.

 

Source File List

• main.cpp
• hasUpcaseLetters.cpp
• vcout.cpp

Header File List

• hasUpcaseLetters.h
• vcout.h

Source Files

main.cpp

#include <iostream>  // cin, cout, endl
#include <string>
#include <vector>
#include "hasUpcaseLetters.h"  // hasUpcaseLetters
#include "vcout.h"  // vcout

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;

int main()
{
    string word;
    vector<string> allLowcaseLetterWords;
    vector<string> someUpcaseLetterWords;

    // Populate vectors
    while (cin >> word) {
        if (hasUpcaseLetters(word))
            someUpcaseLetterWords.push_back(word);
        else
            allLowcaseLetterWords.push_back(word);
    }

    // Print words with at least 1 upper case letter
    cout << "\nThese words contain at least one upper case letter: " << endl;
    vcout(someUpcaseLetterWords);

    // Print pure lower case words
    cout << "\nThese words are pure lower case letters: " << endl;
    vcout(allLowcaseLetterWords);

    return 0;
}

hasUpcaseLetters.cpp

#include <cctype>  // isupper
#include <string>  // string

using std::isupper;
using std::string;

bool hasUpcaseLetters(const string& aWord)
{
    for (string::const_iterator i = aWord.begin(); i != aWord.end(); ++i) {
        if (isupper(*i))
            return true;
    }
    return false;
}

vcout.cpp

#include <iostream>
#include <string>    // string
#include <vector>    // vector

using std::cout;
using std::endl;
using std::string;
using std::vector;

int vcout(const vector<string>& v)
{
    for (vector<string>::const_iterator iter = v.begin();
         iter != v.end(); ++iter)
    {
        cout << (*iter) << endl;
    }
    return 0;
}

Header Files

hasUpcaseLetters.h

#ifndef GUARD_HASUPCASELETTERS_H
#define GUARD_HASUPCASELETTERS_H

#include <string>

bool hasUpcaseLetters(const std::string&);

#endif // GUARD_HASUPCASELETTERS_H

vcout.h

#ifndef GUARD_HASUPCASELETTERS_H
#define GUARD_HASUPCASELETTERS_H

#include <string>

bool hasUpcaseLetters(const std::string&);

#endif // GUARD_HASUPCASELETTERS_H

Test Result

A simple test shows the program works as expected.

Apple
apple
APPLE
aPpLe
applE
orange
oRange
ORANGE
orangE
^Z

These words are pure lower case letters:
apple
orange

These words contain at least one upper case letter:
Apple
APPLE
aPpLe
applE
oRange
ORANGE
orangE

Reference

Koenig, Andrew & Moo, Barbara E., Accelerated C++, Addison-Wesley, 2000