Thread: Homework problem!

Hey guys, heres the instructions for my homework:
1. The program should start by asking the user to enter a word, a sentence, or a string of numbers. Store whatever the user enters into a C++ string.

2. The program should then display the following menu (you must use ‘Q’ for quit):

USE THIS MENU TO MANIPULATE YOUR STRING
----------------------------------------
1) Inverse String
2) Reverse String
3) To Uppercase
4) Count Number Words
5) Count Consonants
6) Enter a Different String
7) Print the String
Q) Quit

If the user selects 1: Inverse the upper and lower case letters of the string. If the string contains numeric characters or special characters do not change them. NOTE: This option should actually change the string to its inverse. Note this option does not display the changed string. If a user wanted to inverse the string and then display the string’s inverse they would select option 1 and then they would select option 7.

Example: If the string is: My name is John and I am 20 years old.
The inverse would be: mY NAME IS jOHN AND i AM 20 YEARS OLD.

If the user selects 2: – Reverse the order of the characters in the string. NOTE: This option should actually change the string to its reverse. Note this option does not display the changed string. If a user wanted to reverse the string and then display the string’s reverse they would select option 2 and then they would select option 7.

Example: If the string is: 2015
The inverse would be: 5102

¨If the user selects 3: Convert all of the characters in the string to uppercase. If the String contains numeric characters or special characters do not change them. NOTE: This option should actually change the string to all uppercase letters. Note this option does not display the changed string. If a user wanted to change the string to uppercase and then display the new string (in all uppercase) they would select option 3 and then they would select option 7.

¨ If the user selects 4: Call a function named countWords that counts the number of words in the current string and displays a message stating how many words are in the string. This option actually should print something.

Examples: The string “2015” has one word
The string “Hello World” has two words

¨ If the user selects 5: Call a function named countConsonants that counts the number of consonants in the current string and displays a message indicating how many consonants the string contains. So this option does print something. Consonants are letters that aren’t vowels (anything EXCEPT a, e, i, o, u).

Example: If the string is: Hello
The number of consonants is: 3
So display: “The number of consonants in the string is 3.”

¨ If the user selects 6: Let the user enter another string for processing. (This should just change the string stored in the original string variable you created at the beginning of the program)


¨ If the user selects 7: Print the String
o So if the original string was “Hello” and the user processed the string with option 3 followed by option 2, followed by option 8, the string would print out as “OLLEH” (This is hello first converted to uppercase and then reversed).

¨ If the user selects ‘Q’ or ‘q’: Quit the program

¨ Allow the user to continue processing strings (using the menu) until they select ‘Q’ or ‘q’ to quit

¨ If the user makes an invalid menu selection, print an error message to the screen

here's the code I have so far

Code:

#include <iostream>
#include <string>
#include <cctype>
#include <iomanip>
using namespace std;


int countWords(string);


int main ()
{
    string str;
    int i = 0;
    char choice;


    cout << "Enter a word, sentence, or a string of numbers" << endl;
    getline(cin, str);


        cout << "USE THIS MENU TO MANIPULATE YOUR STRING" << endl;
        cout << "---------------------------------------" << endl;
        cout << "1) Inverse String " << endl;
        cout << "2) Reverse String " << endl;
        cout << "3) To Uppercase " << endl;
        cout << "4) Count Number Words " << endl;
        cout << "5) Count Consonants " << endl;
        cout << "6) Enter a Different String " << endl;
        cout << "7) Print the String " << endl;
        cout << "Q) Quit " << endl;
        cin >> choice;


        if(choice == '1')
        {
            for( i = 0; i < str.length(); i++)
            {
                if(isupper(str[i]))
                {
                    str[i] = tolower(str[i]);
                }
                else if(tolower(str[i]))
                {
                    str[i] = toupper(str[i]);
                }
            }
            str = str[1];
        }
        if(choice == '2')
        {
            for (i = str.length()-1; i >= 0; i--)
            {
                str = str[i];
            }
        
        }
        if(choice == '3')
        {
            for(i = 0; i < str.length(); i++)
            {
                if(tolower(str[i]))
                {
                    str[i] = toupper(str[i]);
                }
        
            }
                cout << str <<endl;
        }
        if(choice == '4)
        {
            countWords(




        system("PAUSE");
        return 0;
}

the question I have is:
1)how do I get it so it displays the new string whenever i press 7?

2)how would I construct the fuction countWords and countConsonants?

3)and in order for the menu reptition I would have to create a do while statement right? i would much appreciate a basic template, such as
do
menu
if
statement
if
statement

something basic like that

I understand if the questions may seem too demeaning or me being lazy on my part, but I seriously suck at programming as my skills in word problems and basic problem solving seriously SUCKS.

Thanks in advance

Originally Posted by stahta01

One thing I would suggest on this problem is doing the last three items on the menu first.

6) Enter a Different String
7) Print the String
Q) Quit

Because, it would help you to test your program faster.

Tim S.

Would I have to make a do while program? And I still don't know how to make it so whenever I press 7 it prints the new string, I only know how to do it so whenever the user presses whatever number it prints the new string then instead of pressing 7.

Originally Posted by cowell_theodore

I noticed that you were using string, which is part of STL. If you have to use STL, here is something to consider...
basic_string<char> str2;
basic_string<char> ::iterator itr;

then we can iterate through the string using the iterator for(itr= str2.begin(); itr!=str2.end(); itr++) etc... But if you like using the getline() method, and use of STL doesn't matter, I would declare a basic string, use getline() to make sure we don't have any buffer overruns... better if you just see...
//excuse my sloppy code, I usually only use the win32 api for all my string manipulations (strsafe.h for instance) and I only use unicode, wow,
//this is a blast from the stone age!
int i;
string str1;
char* cstr;
getline(cin,str1);
i = str1.length();
cstr = new char[i];
cstr =(char*) str1.c_str();

//now you can index the string and make your changes. i is the max length you should iterate through the string. Other than that, I would make a separate function for the menu. Its been a long time since I viewed a single threaded app Whew!

Good luck and don't be affraid to consult me on any further topics. I wish you the best of luck! From the looks of your code I know you will make it! You are off to a great start, keep it up and help C++ thrive

Hey sorry but I did not understand a word of what you just said. As I said before, I'm a complete noob at this so I literally did not understand a single word of what you just said

I'm trying to make the function countWord but I'm having some problems with it. i put char countWords(string); the function name before the main function and i call it by doing

Code:

if(choice == '4')
{
            word = countWords (str)
}

right? str if you look at my program is the variable for the user when he/she first enters the data

and then the actual function:

Code:

char countWords (string)
        {
            
            string word;
            for(int wordCount = 0; ss >> word; wordCount++);
        
        
            stringstream ss(str);
        
            
        }

is this right? its saying its wrong and it wont compile

i also need to know hwo to make it so whenever the user presses 7 it prints the new string result