Reading files word by word

[JWest46088]

I can't figure out how to read a file word by word. I want to open the file and then read it one word at a time. For example, I'm looking for words that start with d. How would I scan each word of the file to see if it starts with the letter d?

[gpraghuram]

I can't figure out how to read a file word by word. I want to open the file and then read it one word at a time. For example, I'm looking for words that start with d. How would I scan each word of the file to see if it starts with the letter d?

After reading the word check whether the position 0 of the string contains d .
If it is then its the word you are lokking for or else skip it.

char arr[] = "defghi";
if(arr[0] == 'd')
{
 /*This word starts with d*/
}
else
{
/*skip it*/
}
 

Raghuram

[JWest46088]

After reading the word check whether the position 0 of the string contains d .
If it is then its the word you are lokking for or else skip it.

char arr[] = "defghi";
if(arr[0] == 'd')
{
 /*This word starts with d*/
}
else
{
/*skip it*/
}
 

Raghuram

How would I get the word though? I don't know how to get one word at a time. I only know how to use getline a little bit.

Here's the code I have:

                if(myfile.is_open())
                {
                        while(! myfile.eof())
                        {
                                myfile >> word;
                                cout << word << endl;
//                              getline(myfile, word);
//                              cout << word  << endl;
//                              getline(myfile,line);
//                              cout << line << endl;
                        }
                        myfile.close();
                }
        }
 
        return 0;
}
 

It reads the file and outputs one word on a new line, like this:

hello.
my
name
is
joe.

[weaknessforcats]

if(myfile.is_open())
{
while(! myfile.eof())
{
myfile >> word;
cout << word << endl;
// getline(myfile, word);
// cout << word << endl;
// getline(myfile,line);
// cout << line << endl;
}
myfile.close();
}
}

return 0;
}


It reads the file and outputs one word on a new line, like this:

hello.
my
name
is
joe.

I'm sorry, but you are reading the file word by word. Just do what it says in Post #2.

[JWest46088]

I wrote more code. I added two linked lists I need and tried to open the file, read a word at a time, and insert it into the linked list. I don't think I did it right though. When I run the program, it asks the user to input a filename like it's supposed to and accepts the response, but after that, nothing happens. The program just keeps running without doing anything. Feedback of what I did wrong and what I have to do to fix it would be appreciated. Thanks.

Here's my new code:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
 
struct dlist
{
    char dword[30];        //holds a word up to 30 characters
    int dcount;        //number of times a word appears
    dlist *dnext;        //pointer to next node
};
 
struct anylist
{
    char anyword[30];
    int anycount;
    anylist *anynext;
};
 
dlist *dhead = NULL;
dlist *dpos;
anylist *anyhead = NULL;
anylist *anypos;
 
void insert();
void display();
 
int main()
{
    dhead = NULL;
    anyhead = NULL;
    insert();
    display();
 
    cout << "test";
 
    return 0;
}
 
void insert()
{
//    head = NULL;
    dlist *dtemp, *dtemp2;
    anylist *anytemp, *anytemp2;
    string file, word;
 
    dtemp = new dlist;
    anytemp = new anylist;
 
    cout << "\nEnter a file to scan: ";
    cin >> file;
 
    if(file != "dtext.txt")
 
        cerr << "\nInvalid file.\n" << endl;
 
    ifstream myfile("dtext.txt");
 
    while(file == "dtext.txt")
    {
        if(myfile.is_open())
        {
        cout << "file open test";
            while(! myfile.eof())
            {
                myfile >> word;
 
                if(word[0] == 'd')
                {
//                    cout << word << endl;
                    dtemp->dword;
//                    dcount++;
                    dtemp->dnext = NULL;
                }
                else
                {
                    anytemp->anyword;
//                    anycount++;
                    anytemp->anynext = NULL;
                }
 
                if(dhead == NULL)
                {
                    dhead = dtemp;
                    dpos = dhead;
                }
                else
                {
                    dtemp2 = dhead;
 
                    while(dtemp2->dnext != NULL)
                        dtemp2 = dtemp2->dnext;
                    dtemp2->dnext = dtemp;
                }
            myfile.close();
            }
        }
    }
 
    return;
}
 
void display()
{
    dlist *dtemp;
    anylist *anytemp;
 
    dtemp = dhead;
    anytemp = anyhead;
 
    if(dtemp == NULL)
        cout << "The list is empty!" << endl;
    else
    {
        while(dtemp != NULL)
        {
            cout << "D List: " << dtemp->dword << endl;
 
            dtemp = dtemp->dnext;
        }
    }
 
    if(anytemp == NULL)
        cout << "The any list is empty" << endl;
    else
    {
        while(anytemp != NULL)
        {
            cout << "Any List: " << anytemp->anyword << endl;
 
            anytemp = anytemp->anynext;
        }
    }
}    
 

[gpraghuram]

What is the use of this line

    while(file == "dtext.txt")
 

This will loop continuously.
Change to if loop or else remove it.


Raghuram