expected primary-expression before "struct"

This is a discussion on expected primary-expression before "struct" within the C++ Programming forums, part of the General Programming Boards category; Hi boys, I wrote this nice program in c++ a good deal was copied dev-c++ latest version keeps giving this ...

  1. #1
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    expected primary-expression before "struct"

    Hi boys, I wrote this nice program in c++ a good deal was copied dev-c++ latest version keeps giving this error at the compilation : expected primary-expression before "struct"

    I write here just the first part of the code till the mistake, you will find it at the line before the last.
    I need it for a working interview and I am a bit nervous about it.
    Thanks in advance-
    Dora



    Code:
                                   
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <ctype.h>
    //#include "sort_words.h"
    struct word_item {
    	char * word;
    	struct word_item * next;
    };
    
    struct word_list {
    	int length;
    	struct word_item * first_word;
    	struct word_list * next;
    };
    
    struct word_list * first_word_list = NULL;
    
    char * read_word(FILE * fin){
    	char c;
    	int i;
    	char * buffer = (char *)malloc(sizeof(char));
    	buffer[0] = '\0';
    	for (i=0; (c = fgetc(fin))!=EOF; i++) {
    		if (isspace(c) || ispunct(c))
    			break;
    		buffer[i] = c;
    		buffer = (char *)realloc(buffer, sizeof(char)*(i+1));
    		buffer[i+1] = '\0';
    	}
    	if (c == EOF)
    		return NULL;
    	return buffer;
    }
    
    /*
    void init_word_list() {
    	first_word_list = NULL;
    }
    */
    
    struct word_list * 
    init_word_list_item(int length, struct word_list * next, struct word_item * item) {
    	struct word_list * word_list_item;
    	word_list_item = (struct word_list *) malloc(sizeof(struct word_list));
    	if (word_list_item == NULL) {
    		printf("cannot allocate enough memory\n");
    		exit(-1);
    	}
    	word_list_item->length = length;
    	word_list_item->next = next;
    	word_list_item->first_word = item;
    	return word_list_item;
    }
    
    /*void append_word_item(struct word_list * current, struct word_list * new) {
    	new->next = current->next;
    	current->next = new;
    }*/
    
    struct word_list * get_word_list_item(int length) {
    	struct word_list * cwl = NULL;
    	struct word_list * new = NULL;       // Here the error is given
    	struct word_list * previous = NULL;

  2. #2
    Frequently Quite Prolix dwks's Avatar
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    You're probably compiling the code as C++. new is an operator in C++, so you can't have an identifier with that name.
    dwk

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  3. #3
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    yes I am compiling it as c++ that is the idea.

  4. #4
    Frequently Quite Prolix dwks's Avatar
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    Why? That's not C++ code at all. It looks like C code to me, so you should compile it as C code.

    But if you insist on compiling it as C++, then stop using a variable called "new": change it to something else and the compiler should be happy.
    dwk

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
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    Thinking better you are right. So now my problem is to compile it in c under windows.

    I never used c so i did not even know how it looked like. Dev-c++ makes any distinction between the 2?

    Thanks.

  6. #6
    Frequently Quite Prolix dwks's Avatar
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    Yes. Just save the file as a ".c" file, and Dev-C++ will automatically compile it as C code.
    dwk

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
    "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
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  7. #7
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    yeah you write this as if it's C, you don't need to have "struct" before you declare a new object of that structure.

  8. #8
    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by Doraemon View Post
    I never used c so i did not even know how it looked like. Dev-c++ makes any distinction between the 2?
    It seems to me that you've always been using C!
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    Quote Originally Posted by iMalc View Post
    It seems to me that you've always been using C!
    I agree. I don't see much c++ in there. For example, "malloc", "realloc", "fgetc", "printf" are C-operators.

  10. #10
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    Quote Originally Posted by Walle View Post
    I agree. I don't see much c++ in there. For example, "malloc", "realloc", "fgetc", "printf" are C-operators.
    Those are C library functions - which are vastly different things from operators.

    The original code will never compile as C++, as "new" is a reserved keyword in C++, so cannot be used as a name of a variable.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  11. #11
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    Oh ofc, I was being sloppy. The point is that they are C, not C++, though.

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