debug assertion failed

This is a discussion on debug assertion failed within the C Programming forums, part of the General Programming Boards category; Code: /* This program expects the name of an input file and an output file to be given by the ...

  1. #1
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    Post debug assertion failed

    Code:
    /* This program expects the name of an input file and an output
    file to be given by the user.
          Name : Dang Vo
    	  Date : 04/14/11
    */
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #define NUM_LINE 21
    
    typedef struct
    {
    	char states[100];
    	char cities[100];
    	int tempt;
    } INFO;
    void getData(FILE *spData, INFO list[]);  
    void insertionSort(INFO list[], int last);
    
    int main (void)
    {
    
    // Local Declarations
    
    FILE *spData = fopen("in.txt", "r");
    INFO list[NUM_LINE];
    
    
    // Statements
    getData(spData, list);
    
    return 0;
    }
    
    /*========================== getData========================
    Pre: FILE *spData
    Post: FILE *spData 
    */
    // Local Declarations
    int i;  
    
    void getData(FILE *spData, INFO list[NUM_LINE])
    {
    	if((spData = fopen("in.text", "r")) = NULL)
            printf("Error openning in.txt\n");
     
    for (i = 0; i < NUM_LINE; i++)
    fscanf(spData,"%s %s %d", list->states, list->cities, list->tempt );
    
    
    return;
    }
    i have this code here when i try to run it it say debug assertion failed what did i do wrong?

  2. #2
    THANK YOU KINDLY SIR Phenax's Avatar
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    Code:
    if((spData = fopen("in.text", "r")) = NULL)
    Look closely at that line. Not sure if it's directly related to your problem however.
    Quote Originally Posted by Plato
    Never discourage anyone...who continually makes progress, no matter how slow.

  3. #3
    and the hat of wrongness Salem's Avatar
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    Debug assertions usually come with some kind of statement as to what failed, usually in the form of a predicate which evaluated to false.

    Say
    assert( str != NULL )

    Aside from the = issue already mentioned, why are you opening the file twice.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  4. #4
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    Ok you've created an array of 21 INFO items...

    Code:
    INFO list[NUM_LINE];
    Then you call your function...
    Code:
    void getData(FILE *spData, INFO list[NUM_LINE])
    but you only pass in one item in the array... #21...

    However... You have an array of 21 items. In C arrays start at 0, not 1... so an array with 21 items has valid indexes from 0 to 20... not 1 to 21... thus element 21 is actually out of bounds for the array.

    You need to pass in a pointer...
    Code:
    void getData(FILE* spData,INFO *list);
    Which you would call as...
    Code:
    getData(spData,list);
    then in your loop you load your array like it's a single struct...
    Code:
    fscanf(spData,"%s %s %d", list->states, list->cities, list->tempt );
    In this case #21... which is out of bounds.

    The correct notation is more like...
    Code:
    fscanf(spData,"%99s %99s %d", list[i].states, list[i].cities, list[i].tempt);
    Last edited by CommonTater; 04-15-2011 at 09:43 AM.

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