how to make a if a char equals something

This is a discussion on how to make a if a char equals something within the C++ Programming forums, part of the General Programming Boards category; Sorry for the confusing title but here's what I want to do: Code: #include <iostream> using namespace std; int main() ...

  1. #1
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    Unhappy how to make a if a char equals something

    Sorry for the confusing title but here's what I want to do:

    Code:
    #include <iostream>
    
    using namespace std;
    int main()
    
    {
        char search[50];
        cout<<"Welcome to Google! What are you looking for?\n\n";
        cin>>search;
        if (search == test ) {
                   cout<<"Good";
                   cin.ignore();
        }
        if (search != test) {
        cin.ignore();
        cout<<"\nSorry! " <<search <<" wasn't found!\n\n";
        system("pause");
    }
    }
    Why doesn't this work?

  2. #2
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    How doesn't it work?

  3. #3
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    when I compile it in DEV-C++ it gives me an error

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    What is the error?

  5. #5
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    it says that "`test' undeclared (first use this function)" on the tenth line. and then " (Each undeclared identifier is reported only once for each function it appears in.) "

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    `test' undeclared
    What do you think that means?

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    I just don't get it anymore can't you just show me what do to?

  8. #8
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    What part of "`test' undeclared" do you not get?

    Did you declare a variable called test?

    Hint: you should.

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    Uh, nevermind, I have another idea

  10. #10
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    Actually, I think cyberfish is both right and wrong - you probably do not want to declare a variable called test, you probably want to have a constant string that you compare with your input. Use "" to surround constant strings, just like when you do output.

    And by the way, when you do "if (x == y) ..." followed by "if (x != y)", you should really replace the second if with "else" - since the first statement and the second are always true in the opposite case [1].

    [1] Of course, if you are actually modifying x or y inside the first if, then that's not strictly true. Do not worry about this bit right now, I'm just preventing someone else from side-tracking the subject.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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    Ah good call. I actually didn't read the code. Just trying to get him to do some troubleshooting himself, since he showed no effort at all.

  12. #12
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    right under main (){
    put:
    char test;

  13. #13
    Registered User BuzzBuzz's Avatar
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    Quote Originally Posted by walkonwater View Post
    right under main (){
    put:
    char test;
    That'll get rid of the error, but not the problem.
    Any help I give may be classified as:
    The Blind leading the Blind...
    Currently working through:
    "C++ Primer Plus"

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    C Strings - C Tutorial - Cprogramming.com Here you can find information about strings, how to compare one string to another and so on.

  15. #15
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by Shakti View Post
    C Strings - C Tutorial - Cprogramming.com Here you can find information about strings, how to compare one string to another and so on.
    Oh no no no no.
    This is C++, so C-style strings we should avoid. Here is a better tutorial, methinks:
    Cprogramming.com - C++ Standard Library - String Class
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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