String arrays

This is a discussion on String arrays within the C++ Programming forums, part of the General Programming Boards category; Hi all, I am pretty new to c++ programming but fairly good at VB . My question is this:- I ...

  1. #1
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    Question String arrays

    Hi all,
    I am pretty new to c++ programming but fairly good at VB.

    My question is this:-
    I want to create an array of strings such that
    string[1]="sheep"
    string[2]="cows "
    string[3]="pigs " etc etc...(which is easy in VB)

    The problem is that strings themselves are treated as character arrays in c++

    so I need a 2 dimensional array, eg. animals[10][10]

    the problem is I can declare the array, but then I cannot get it to accept any input as strings for example...

    animals[5][5]="A" works and puts the character "A" at 5,5 but

    animals[5][5]="pigs " does not, neither does
    animals[][5]="pigs " or
    animals[5][]="pigs ".

    is there any way of assigning strings directly to arrays like this or will I have to start using pointers?

    Thanks in anticipation

    by the way, this is not homework, I am 42 years old!
    Homer

    D'OH!

    mmmmmmmm... iterations

  2. #2
    Registered User jasrajva's Avatar
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    you'll need to include string.h

    and use strcpy

    eg

    strcpy(animal[5], " pigs ");

    would copy pgs into animal[5] which is a char ptr

    and btw i'm 19

  3. #3
    It's full of stars adrianxw's Avatar
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    To initialise a character string array, (I'm assuming that's what you want), use this construction...

    char array[10][10] = {"horse", "pig"};
    cout << array[0]<<" "<<array[1]<<endl;
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

  4. #4
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    Create and initialize an array of character pointers as follows:

    char* cpArray[3] = { "sheep", "cows", "pigs" };

    Doing this will give you:

    cpArray[0] equal to "sheep"
    cpArray[1] equal to "cows"
    cpArray[2] equal to "pigs"

  5. #5
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    If you're using C++, you might want to use the string class, because then you don't need to worry about string lengths.

    Code:
    #include <iostream>
    #include <string>
    
    int main()
    {
    string animal[5];
    
    animal[0] = "pig";
    animal[1] = "cows";
    animal[2] = "sheep";
    animal[3] = "horse";
    animal[4] = "4/2/3 legged creature";
    
    cout << "Animals:\n";
    cout << animal[0] << ", " << animal[1] << ", " 
         << animal[2] << ", " << animal[3] << ", and " 
         << animal[4] << ".\n";
    
    return 0;
    }

  6. #6
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    Arrow Thanks.

    Thank everybody, you've been a great help.

    The copying using strcpy() 'sort of' worked but gave a system error message (I think I tried to put too many characters into my array

    The creation of an array of pointers worked well (thanks unregistered) and will give me what I needed.

    I was intrigued by the string class thingie(robwhit), although this didn't work as it was written, it came up with an undeclared variable 'string' error, I think this was because the string class had not yet been defined and I intend to go away and read up about classes.

    Thanks again
    Homer

    D'OH!

    mmmmmmmm... iterations

  7. #7
    It's full of stars adrianxw's Avatar
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    Robwhit's example omits the line...

    using namespace std;

    ... after the includes.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

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