string undeclared ?

This is a discussion on string undeclared ? within the C++ Programming forums, part of the General Programming Boards category; Code: I have got some truble,like these: dream@liuguobiao:~/Desktop$ cat c.c #include <stdio.h> #include <string.h> int main() { string st; st ...

  1. #1
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    Unhappy string undeclared ?

    Code:
    I have got some truble,like these:
    
    dream@liuguobiao:~/Desktop$ cat c.c
    #include <stdio.h>
    #include <string.h>
    
    int main()
    {
            string st;
            st = Getline();
            return 0;
    }
    dream@liuguobiao:~/Desktop$ gcc -o c c.c
    c.c: In function 'main':
    c.c:6: error: 'string' undeclared (first use in this function)
    c.c:6: error: (Each undeclared identifier is reported only once
    c.c:6: error: for each function it appears in.)
    c.c:6: error: expected ';' before 'st'
    c.c:7: error: 'st' undeclared (first use in this function)
    dream@liuguobiao:~/Desktop$ 
    
    why it said "string undeclared" ?
     I can find "string.h"  in  "/usr/include" 
     but why i can't use 'string' declared the 'st'  ?
     help me ......

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    There is no data type in C called "string". (There is in C++, if that's what you meant to use.)

  3. #3
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    Code:
    I am chage the code to :
    #include <iostream>
    #include <string>
    useing namespace std;
    int main()
    {
            string st;
            return 0;
    }
    but it return :
    c.cpp:3: error: expected constructor, destructor, or type conversion before 'namespace'
    c.cpp: In function 'int main()':
    c.cpp:6: error: 'string' was not declared in this scope
    c.cpp:6: error: expected `;' before 'st'
    I don't understand ,can you help me?

  4. #4
    and the Hat of Guessing tabstop's Avatar
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    You should spell "using" appropriately.

  5. #5
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    OH ! I am sorry . It run ! Thanks !!
    I using the Getline(),it said 'Getline' was not declared in this scope.
    can you tell me Getline() in which head file ? Not "string.h" ?
    Last edited by liuguobiao; 02-20-2009 at 09:40 PM.

  6. #6
    C++ Witch laserlight's Avatar
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    The function is named getline, not Getline.

    *Moved to C++ programming forum*
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  7. #7
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    Thanks very much !laserlight .
    I will study hardly in it .
    Thanks !!

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