Array question

This is a discussion on Array question within the C++ Programming forums, part of the General Programming Boards category; Hey guys I was just wondering when entering data into a char array for example using getline and someone input ...

  1. #1
    182
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    Array question

    Hey guys I was just wondering when entering data into a char array for example using getline and someone input the following:

    "this is a test"

    and then in the same array using the getline "test" was entered. would the array then contain "test is a test" or is a null terminator automatically included when something is added to the array?

    Thanks.

    EDIT: my bad should have said getline
    Last edited by 182; 04-23-2006 at 02:04 PM.

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    Quote Originally Posted by 182
    and then in the same array using the geting "test" was entered. would the array then contain "test is a test" or is a null terminator automatically included when something is added to the array?
    Huh??? "using the geting"
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  3. #3
    Confused Magos's Avatar
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    Try it! But I'm pretty sure it is added.
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  4. #4
    Registered User whiteflags's Avatar
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    First of all, cin.get() is used to fill empty character arrays. You have to use a C-string function to replace all or part of a string:
    Code:
    #include <cstring>
    #include <iostream>
    
    int main()
    {
        char buff[40], test[5] = "Test";
        std::cin.get(buff, 40);
        
        std::cout << strncpy(buff, test, 4);
           
        std::cin.ignore();
        std::cin.get(); // pause for user
        return 0;
    }
    Output:
    Code:
    This is a test.
    Test is a test.

  5. #5
    Confused Magos's Avatar
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    get() reads a set number of bytes so of course it won't append extra data. The OP mentioned getline which does add a NULL terminator (just tested this). Also you use strncpy which explicitly says in the docs doesn't add a NULL-terminator.
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