Do not understand this error

This is a discussion on Do not understand this error within the C Programming forums, part of the General Programming Boards category; OK im getting one more error while compiling Undefined first referenced symbol in file main /usr/sfw/lib/gcc/sparc-sun-solaris2.10/3.4.3/crt1.o ld: fatal: Symbol referencing ...

  1. #1
    Ron
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    Do not understand this error

    OK im getting one more error while compiling

    Undefined first referenced
    symbol in file
    main /usr/sfw/lib/gcc/sparc-sun-solaris2.10/3.4.3/crt1.o
    ld: fatal: Symbol referencing errors. No output written to a.out
    collect2: ld returned 1 exit status

    ...
    THere is no line number given.What does this mean?

  2. #2
    Devil's Advocate SlyMaelstrom's Avatar
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    It means you're referencing an identifier that has no definition that it can see. Why don't you post your code?
    Sent from my iPadŽ

  3. #3
    Ron
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    Its a huge code

    Code:
    #include<string.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include "stack.h"
    
    /*
     * *********************************StackInit
     * A new stack variable is initialized.  The initialized
     * stack is made empty.
     * INPUT: stackP
     * OUTPUT:void
     */
    
    void StackInit(stackST *stackP)
    {
      stackElement *newContents;
    
      /* Allocate a new array to hold the contents. */
    
      newContents = (stackElement *)malloc(sizeof(stackElement) * 10);
    
      stackP->contents = newContents;
      stackP->lineST = 0;
      stackP->top = -1;  /* I.e., empty */
    }
    
    
    /*
     * ******************************StackPush
     * Add an element to the top of the stack
     * INPUT: stackP. element and the line number where the tag was found
     * OUTPUT:void
     *
     */
    
    void Push(stackST *stackP, stackElement element, int line)
    {
    
      /* Put information in array; update top. */
    
      stackP->contents[++stackP->top] = element;
      stackP->lineST=line;
    }
    
    
    /*
     * ******************************StackPop
     * Remove an element from the top of the stack.It first checks if the previous opening tag is closed,
     * else it displays an error and recursively checks if the next opened tag has been closed.
     * INPUT: stackP. element and the line number where the tag was found
     * OUTPUT:void
     *
     */
    
    stackElement Pop(stackST *stackP, char *checkelement, int line)
    {
    
      	if	(strcmp(checkelement,stackP->contents)==0)
        return stackP->contents[stackP->top--];
        else
        {
           printf("\n Error: unmatched tag </%s>in line %d corresponding to line %d",checkelement,line,stackP->lineST);
           stackP->top--;
           return Pop(stackP,checkelement,line);
        }
    
    }

  4. #4
    Just Lurking Dave_Sinkula's Avatar
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    Do you have a main function somewhere?
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  5. #5
    int x = *((int *) NULL); Cactus_Hugger's Avatar
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    That's not your whole code. I don't see anything wrong with that file itself (that would cause a linker to throw errors: there are a few code issues (don't cast malloc()).

    Suggestions:
    1) You can attach code rather than pasting if you feel it is too big for a post.
    2) You do have a main(), don't you?
    3) Try a clean compile. (Perhaps with -Wall too)
    long time; /* know C? */
    Unprecedented performance: Nothing ever ran this slow before.
    Any sufficiently advanced bug is indistinguishable from a feature.
    Real Programmers confuse Halloween and Christmas, because dec 25 == oct 31.
    The best way to accelerate an IBM is at 9.8 m/s/s.
    recursion (re - cur' - zhun) n. 1. (see recursion)

  6. #6
    Ron
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    This is my main method

    Code:
    #include <stdio.h>
    #include <string.h>
    #include "stack.h"
    #include <stdlib.h>
    
    
    int main(void)
    {
    	stackST s1;
    	int line = 0;
    	char c;
    	char element[10];    /* Tag that is captured.*/
    	char newelement[10]; /* New element to be pushed.*/
    	char check[10];   /* Check tag that is sent to the pop function*/
    	int i=0;/*counters*/
    	int j,k=0;/**/
    	int *temp;/* temporary pointer to copy only the words in the tag leaving out unnecessary input like <>*/
    	char code[500];/* each line that is parsed from the input file*/
    
        /*Initializes the stack*/
    	stackInit(&s1);
    
    	while (scanf("%s",code)!=EOF)
    	{
    
    		++line;
    		while (i<strlen(code))
    		{
    			c=code[i];
    			if (c == '<')
    			{
    
    	            j=0;
    	            do
    	            {
    					c=code[i];
    					element[j++]=c;
    					code[i++];
    				}while(c!='>');
    
    
    				if (element[1] == '/') /* if close tag*/
    				{
    					*temp=element[2];
    					k=0;
    					while(k<=strlen(element)-3)
    					check[k++]=putchar(*temp++);
    					Pop(&s1, check,line);
    					printf("%s",element);
    
    				}
    				else if(element[1] == '!')/* if comments, that should be delted from the output*/
    				{}
    				else        /* If opening tag*/
    				{
    					*temp=element[1];
    					k=0;
    					while(k<=strlen(element)-2)
    					newelement[k++]=putchar(*temp++);
    
    					Push(&s1,newelement,line);
    					printf("%s",element);
    
    				}
    
    			}
    			else
    			printf("%c",c);/* print everything that is not a tag*/
    
    		}
    	}
    	printf("\n \n \n File was successfully verified");
    	putchar('\n');
    	return 0;
    }

  7. #7
    Ron
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    stack.h

    Code:
    #include <stdlib.h>
    
    typedef char stackElement; /* the type of the objects entered in the stack.*/
    
    
    /* Stack structure*/
    typedef struct {
    	stackElement *contents;
    	int top;
    	int lineST;
    }stackST;
    
    void StackInit (stackST *stackP);
    
    void Push(stackST *stackP, stackElement element, int line);
    
    stackElement Pop(stackST *stackP, char *checkelement, int line);

  8. #8
    Ron
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    Arrow

    Why do you say not to use the malloc function?

  9. #9
    Devil's Advocate SlyMaelstrom's Avatar
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    He didn't say don't use malloc, he said don't cast malloc.
    Sent from my iPadŽ

  10. #10
    Just Lurking Dave_Sinkula's Avatar
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    I'd say crank up the warnings level on your compiler and try to fix the compiler issues first (like what do you want this to do?).
    Code:
    	            do
    	            {
    					c=code[i];
    					element[j++]=c;
    					code[i++];
    				}while(c!='>');
    The changes mentioned in your other thread cascade through the code, so there are a number of places to fix.
    Code:
    void Push(stackST *stackP, stackElement element, int line)
    {
    
      /* Put information in array; update top. */
    
      stackP->contents[++stackP->top] = element;
      stackP->lineST=line;
    }
    element needs to be a pointer, and that changes things as well.
    Code:
       int *temp;/* temporary pointer to copy only the words in the tag leaving out unnecessary input like <>*/
    Don't let this pointer dangle.
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  11. #11
    Ron
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    I didnt understand what you meant bout thelast 2 changes. Please explain.
    Thanks.

  12. #12
    Ron
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    I mean I didnt understand the last error about the pointer dangling.

  13. #13
    ATH0 quzah's Avatar
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    The pointer is not initialized. It points to nothing and something. It points to something that is nothing, yet does not fit the definition of nothing. It it a very profound concept, understood by very few. Mastered by even fewer. Ponder this. Study its meaning, Grasshopper.


    Quzah.
    Hope is the first step on the road to disappointment.

  14. #14
    Registered User whiteflags's Avatar
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    That was beautiful, quzah.

  15. #15
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    If you understand what you're doing, you're not learning anything.

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