Comparison between pointer & integer

This is a discussion on Comparison between pointer & integer within the C Programming forums, part of the General Programming Boards category; Hello! I am trying to create a loop that searches a struct array for the value of 'remove' (which is ...

  1. #1
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    Comparison between pointer & integer

    Hello!

    I am trying to create a loop that searches a struct array for the value of 'remove' (which is a char).

    Struct:

    Code:
    typedef struct
    {
        char track[99];
        char trackname[99]; 
        char artist[99];
        char genre[99];
    }   song; //creates a struct called song;
    
    song songs[99];

    Code to search for a track name:

    Code:
               int i;
                        for(i=0;i<99;i++)
    
                        {
                            if(*songs[i].trackname == remove)
        	                {	
                                 printf("found it");
                                }
        	                }
                        }
    The problem is that I am told 'comparison between pointer and integer'. I could remove the '*', but will then be told 'comparison of distinct pointer types lacks a cast'.

    I am assuming that 'song[i] and trackname are variable types that cannot be compared? I don't really know what the '*' does, but I saw it on some site discussing this problem so thought I might try it lol.

  2. #2
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    need to use strcmp() for comparing strings!

  3. #3
    cas
    cas is offline
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    You shouldn't name something “remove”, as that's the name of a standard function. It sounds to me like the comparison is using the standard remove, and not yours, according to the error messages. Of course, without a complete program I'm only left guessing.

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    I didn't realise 'remove' is a standard function, so have renamed it to 'aremove'. I called it that because once I get this working, I want to try change it so that it can remove a song in the struct.

    How would the strcmp() be used? I didn't know I was comparing strings lol.

  5. #5
    C++まいる!Cをこわせ! Elysia's Avatar
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    I don't know how remove is declared, so I cannot say if it's a string or not. Anyway, strcmp is used like this:
    strcmp(str1, str2)
    It returns 0 if the strings are equal.
    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.

  6. #6
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    Code:
    strcmp(songs[i], aremove)==0;
    And I am told 'incompatible type for argument 1 of 'strcmp'.

    FYI, this is the declaration of 'aremove' (other variables have been deleted to make this shorter).

    Code:
    int main(void)
    
    {
        system("color f5");
        
        int  aremove;
    I could paste the code, but it's 137 lines and I'm not sure if it would be a pain to go through.

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