Programming Forums > Application Development > C++

Ooble · Apr 26th, 2005, 4:41 PM

Yup:

INSTEAD OF
char note[999];
DO
std::string note;

brokenhope · Apr 26th, 2005, 4:46 PM

Complier messes up... it doesnt recognize string

`::string' undeclared (first use here)
`note' undeclared (first use this function)

(Toggle Plain Text)

void addNote() {
cout << "Enter the text for the note: ";
std::string note;
cin.ignore();
gets ( note );
cout << note;
}

Is that what you meant? I also tried string without std:: (because I have using namespace std

but I got the same errors, is there a header file I need or something?

Ooble · Apr 26th, 2005, 4:58 PM

Oh... sorry - forgot about that:

(Toggle Plain Text)

#include <string>

brokenhope · Apr 26th, 2005, 6:59 PM

Hmm I get the same errors after including it still...

EDIT

oops I didnt know there was a diffrence between string.h and string I thought they were the same and you just put the .h ending depending on your compiler.

gets ( ); doesnt work now, it says it cant convert string to *char.

EDIT

getline (cin, note);

worked, and now everything so far is working, now I want to make a wordwrap which im sure will be hella hard to do, but the text spacing out as odd as it is right now, half of a word on one like and 2 letters on the next is getting annoying, and starting a line out with a space is getting annoying... so is it even worth it to try to write a word wrapper?

Ooble · Apr 27th, 2005, 12:34 PM

Why not?

brokenhope · Apr 27th, 2005, 5:59 PM

Why not make one? I really have no clue how to... since im still new to C++ I still dont know any methods of how to do things.

I was thinking I would have to put the string through a loop and it seperated the string into temporary strings (each temp string containing one line), and it inserts a word to the end of the array one by one if it will fit on the line, and it goes through the whole string of words doing that... but I still dont know how to tell if the word fits or not, or even how to make this, or if its even sloppy coding, or the only way there is to do it 0_o.

Ooble · Apr 27th, 2005, 6:23 PM

Here's an idea: split the string into an array, separated by spaces. For example:

(Toggle Plain Text)

string words[] = {"The", "quick", "brown", "fox"};

You'd have to use pointers to do this, unfortunately. Next, just keep outputting and recording how many characters you've used, and add a new line whenever you need to. Generally, the console's 80 characters across.

brokenhope · Apr 27th, 2005, 7:05 PM

hmm Im horrible with pointers, just recently learned them and I still dont understand how theyd be useful in this situation, ill look up in the refrence librarys at cplusplus.com for any functions I can use since im drawing a blank on how to even get it into an array, and I cant really hand type each array. But I still dont know how to do the pointer stuff.

Ooble · Apr 28th, 2005, 1:12 PM

That's what I'm saying - you need pointers to get it into the array:

(Toggle Plain Text)

// loop through and count the number of spaces:
int count = 0;
for (int i = 0; note[i]; i++)
{
    if (note[i] == 0x20)
    {
        count++;
    }
}

// declare a new array with that many items plus one
string *words = new string [count + 1];

int lastSpace = -1;
count = 0;

for (int i = 0; note[i]; i++)
{
    if ((note[i] == 0x20))
    {
        *(words + count) = note.substr(lastSpace + 1, i - lastCount + 1);
        count++;
    }
}
*(words + count) = note.substr(lastSpace + 1, note.length());

That'll load 'em into an array (hopefully - it hasn't been tested).

bl00dninja · Apr 29th, 2005, 1:30 AM

one of the classic uses of pointers in the C language is to have arrays of pointers for string manipulation. because of the way C handles strings as arrays of characters you need this sort of dynamic array of arrays approach for this. this is one of the reasons i think everyone should learn C at least to the point where strings and arrays and pointers come together. it gives you a better understanding od programmming in general. every once in a while i quit learning C++ to rebuild and strengthen my mad crazy C $ki11Z dawg. w00t!

Apr 26th, 2005, 4:41 PM	#11
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Yup: (Toggle Plain Text) INSTEAD OF char note[999]; DO std::string note; INSTEAD OF char note[999]; DO std::string note; __________________ Me :: You :: Them

Apr 26th, 2005, 4:46 PM	#12
brokenhope Hobbyist Programmer Join Date: Apr 2005 Posts: 126 Rep Power: 4	Complier messes up... it doesnt recognize string `::string' undeclared (first use here) `note' undeclared (first use this function) (Toggle Plain Text) void addNote() { cout << "Enter the text for the note: "; std::string note; cin.ignore(); gets ( note ); cout << note; } void addNote() { cout << "Enter the text for the note: "; std::string note; cin.ignore(); gets ( note ); cout << note; } Is that what you meant? I also tried string without std:: (because I have using namespace std but I got the same errors, is there a header file I need or something?

Apr 26th, 2005, 4:58 PM	#13
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Oh... sorry - forgot about that: (Toggle Plain Text) #include <string> #include <string> __________________ Me :: You :: Them

Apr 26th, 2005, 6:59 PM	#14
brokenhope Hobbyist Programmer Join Date: Apr 2005 Posts: 126 Rep Power: 4	Hmm I get the same errors after including it still... EDIT oops I didnt know there was a diffrence between string.h and string I thought they were the same and you just put the .h ending depending on your compiler. gets ( ); doesnt work now, it says it cant convert string to char. EDIT getline (cin, note); worked, and now everything so far is working, now I want to make a wordwrap which im sure will be hella hard to do, but the text spacing out as odd as it is right now, half of a word on one like and 2 letters on the next is getting annoying, and starting a line out with a space is getting annoying... so is it even worth it to try to write a word wrapper? Last edited by brokenhope; Apr 26th, 2005 at 8:08 PM.*

Apr 27th, 2005, 12:34 PM	#15
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Why not? __________________ Me :: You :: Them

Apr 27th, 2005, 5:59 PM	#16
brokenhope Hobbyist Programmer Join Date: Apr 2005 Posts: 126 Rep Power: 4	Why not make one? I really have no clue how to... since im still new to C++ I still dont know any methods of how to do things. I was thinking I would have to put the string through a loop and it seperated the string into temporary strings (each temp string containing one line), and it inserts a word to the end of the array one by one if it will fit on the line, and it goes through the whole string of words doing that... but I still dont know how to tell if the word fits or not, or even how to make this, or if its even sloppy coding, or the only way there is to do it 0_o.

Apr 27th, 2005, 6:23 PM	#17
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Here's an idea: split the string into an array, separated by spaces. For example: (Toggle Plain Text) string words[] = {"The", "quick", "brown", "fox"}; string words[] = {"The", "quick", "brown", "fox"}; You'd have to use pointers to do this, unfortunately. Next, just keep outputting and recording how many characters you've used, and add a new line whenever you need to. Generally, the console's 80 characters across. __________________ Me :: You :: Them

Apr 27th, 2005, 7:05 PM	#18
brokenhope Hobbyist Programmer Join Date: Apr 2005 Posts: 126 Rep Power: 4	hmm Im horrible with pointers, just recently learned them and I still dont understand how theyd be useful in this situation, ill look up in the refrence librarys at cplusplus.com for any functions I can use since im drawing a blank on how to even get it into an array, and I cant really hand type each array. But I still dont know how to do the pointer stuff.

Apr 28th, 2005, 1:12 PM	#19
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	That's what I'm saying - you need pointers to get it into the array: (Toggle Plain Text) // loop through and count the number of spaces: int count = 0; for (int i = 0; note[i]; i++) { if (note[i] == 0x20) { count++; } } // declare a new array with that many items plus one string words = new string [count + 1]; int lastSpace = -1; count = 0; for (int i = 0; note[i]; i++) { if ((note[i] == 0x20)) { (words + count) = note.substr(lastSpace + 1, i - lastCount + 1); count++; } } (words + count) = note.substr(lastSpace + 1, note.length()); // loop through and count the number of spaces: int count = 0; for (int i = 0; note[i]; i++) { if (note[i] == 0x20) { count++; } } // declare a new array with that many items plus one string words = new string [count + 1]; int lastSpace = -1; count = 0; for (int i = 0; note[i]; i++) { if ((note[i] == 0x20)) { (words + count) = note.substr(lastSpace + 1, i - lastCount + 1); count++; } } (words + count) = note.substr(lastSpace + 1, note.length()); That'll load 'em into an array (hopefully - it hasn't been tested). __________________ Me :: You :: Them

Apr 29th, 2005, 1:30 AM	#20
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 5	one of the classic uses of pointers in the C language is to have arrays of pointers for string manipulation. because of the way C handles strings as arrays of characters you need this sort of dynamic array of arrays approach for this. this is one of the reasons i think everyone should learn C at least to the point where strings and arrays and pointers come together. it gives you a better understanding od programmming in general. every once in a while i quit learning C++ to rebuild and strengthen my mad crazy C $ki11Z dawg. w00t! __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

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Programming Forums > Application Development > C++

Making a Note Adder/ Editor/ Deleter/ Viewer thingy