Help with some error...(linked list)

This is a discussion on Help with some error...(linked list) within the C Programming forums, part of the General Programming Boards category; I want to read data from a file and parse it into a linked list.But after i had coded the ...

  1. #1
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    Nov 2006
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    Help with some error...(linked list)

    I want to read data from a file and parse it into a linked list.But after i had coded the program, it got few erros that i can figure it out. Anyone here can help me for that?
    Thanks!

    This are the data from the file:
    0602R00001,Alex Zhu,12.5,20.5,35,68,CR
    0602R12345,Bobby Brain,14.5,24.5,59.5,98.5,HD
    0602R98765,Charles Laz,7,0,0,0,F
    0602R87654,Daniel Dun,8
    0602R22222,Eyvonne Young,10

    Part of my code that reading the file and parse the data
    Code:
    typedef struct studentNode
    {
       char id[ID_MAX + 1];
       char name[NAME_MAX + 1];
       float mark[MARK_MAX];
       char grade[GRADE_MAX + 1];
       struct studentNode* nextStudent;
    } StudentNode;
    
    typedef struct studentList
    {
       Components comp[MARK_MAX - 1];
       StudentNode* head;
    } ClassList;
    
    /*******************************************************
    * Parse each line in student data file into student node 
    ********************************************************/
    int parseText(char * buf, StudentNode * temp){
    	
    	int i;	
    
    	buf = strtok(buf, ",");
    	
    	for(i=0; buf != NULL; i++)
    	{
    		if(i==0)temp->id = buf;
    		if(i==1)temp->name = buf;
    		if(i>1 && i<6)temp->mark[i-2] = buf;
    		if(i==6)temp->grade = buf;
    	}
    
    	temp->nextStudent = NULL;
    	return 0;
    }
    
    /************************************************************************************
    * Function loadstudent() is used to load the student data file, and parse the file to linked list
    *************************************************************************************/
    void loadStudent(ClassList* student, char* fileName){
    	
    	FILE *fp;
    	StudentNode *head;
    	StudentNode *temp = NULL;
    	StudentNode *next = NULL;
    	char buf[50] = "";
    	int record = 0;
    	
    	fileName = strcat(fileName, ".mrk.dat");
    	if( (fp = fopen(fileName, "r")) != NULL)
    	{
    		printf("\nFile Found.");
    		
    		fp = fopen(fileName, "r");
    						
    		head = (StudentNode *) malloc (sizeof (StudentNode));
    		temp = (StudentNode *) malloc (sizeof ( StudentNode));
    		next = (StudentNode *) malloc (sizeof ( StudentNode));
    
    		if ((fread (buf, 50, 1, fp)) == 0)
    		{
    			fclose(fp);
    			head = NULL;
    		}
    		record++;
    		parseText(buf, head);
    		temp = head;
    		while (fread (buf, 50, 1, fp) != 0)
    		{
    			printf("%s", temp->id);
    			parseText(buf, next);
    			temp->nextStudent = next;
    			record++;
    		}
    		temp->nextStudent = NULL;
    		if(record == 0)
    		{
    			printf("Database Empty");
    		}
    		else
    			printf("\nContains %d record.", record);	
    	}
    	
    	else
    	{
    		printf("\nFile Not Found.\n");
    		exit(1);
    	}	
    	
    	
    }
    After i compile, it occurs 4 erros. (bold line in my code)

    assign2.c:192: incompatible types in assignment
    assign2.c:193: incompatible types in assignment
    assign2.c:194: incompatible types in assignment
    assign2.c:195: incompatible types in assignment

  2. #2
    Code Goddess Prelude's Avatar
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    9,796
    >if(i==0)temp->id = buf;
    >if(i==1)temp->name = buf;
    >if(i>1 && i<6)temp->mark[i-2] = buf;
    >if(i==6)temp->grade = buf;
    id, name, mark, and grade are all arrays. buf is a pointer. If somebody told you that arrays and pointers are the same, or interchangeable, they were wrong. Try using strcpy instead of direct assignment. Also, before you come running back with an infinite loop, note that you aren't calling strtok again inside the body of your for loop.
    My best code is written with the delete key.

  3. #3
    Registered User
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    2
    thanks bro@
    after i use strcpy..

    Code:
    strcpy(temp->mark[i-2],buf);
    this will occur error with error message "incompatible type for argument 1 of `strcpy' "

    And even i excluded strcpy(temp->mark[i-2],buf); part, my code can be compiled, and when i run it, it stop at "Database Found" only, and will not prints out the info that i need.
    Code:
    printf("%s", temp->id);
    Any idea why@? i cant figure it out..brain stuck already..

    Also, before you come running back with an infinite loop, note that you aren't calling strtok again inside the body of your for loop.
    It means that??...

  4. #4
    Eager young mind
    Join Date
    Jun 2006
    Posts
    342
    > float mark[MARK_MAX];

    In your strcpy , both the arguments in that function must be of the type char *..
    which is not the case in your program
    In the middle of difficulty, lies opportunity

  5. #5
    ATH0 quzah's Avatar
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    I've also noticed you don't quite seem to have a clear grasp of what @ is actually for.


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

  6. #6
    Registered User SKeane's Avatar
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