Thread: File Input

I have a question regarding reading input from a file.

The input file (input.txt):

Code:

8 9 2.5
10 5 2.6
7 15 9.5
0 0 0
1
1 8

My program:

Code:

#include <stdio.h>

#define MAX_TBL_SIZE 30

int main()
{
    FILE *ifp;
    
    char name[10];
    int index = 0;
    int ind2;
    int id[MAX_TBL_SIZE], stock[MAX_TBL_SIZE];
    float price[MAX_TBL_SIZE];
    
    // Reads user input for filename. 10 character long string. Guaranteed to be correct filename.
    printf("Enter the name of the input file:\n");
    scanf("&#37;s", name);
    printf("\n");

    // Opens the filename entered
    ifp = fopen(name, "r");
    
    // Adds variables from file into specified arrays
    while(id[index] != 0 && stock[index] !=0 && price[index] != 0.0)
    {
                    fscanf(ifp, "%d", &id[index]);
                    fscanf(ifp, "%d", &stock[index]);
                    fscanf(ifp, "%f", &price[index]);
                    
                    index++;
    }
    
     
    // Prints current index value
    printf("DEBUGGER: INDEX = %d\n", index);
    
    // Prints each value of array id untill it reaches the index vaule
    for (ind2 = 0; ind2 < index; ind2++)
    {
        printf("DEBUGGER: id[%d] = %d", ind2, id[ind2]);
        printf("\n");
    }
    
    // Same as above, except for stock array
    for (ind2 = 0; ind2 < index; ind2++)
    {
        printf("DEBUGGER: stock[%d] = %d", ind2, stock[ind2]);
        printf("\n");
    }
    
    // Repeated for price array
    for (ind2 = 0; ind2 < index; ind2++)
    {
        printf("DEBUGGER: price[%d] = %.2f", ind2, price[ind2]);
        printf("\n");
    }
    

     // Shows current location in file
     fscanf(ifp, "%d", &num);
     printf("CURRENT LOCATION fscanf: %d\n", num);

    // Closes file
    fclose(ifp);

    system("PAUSE");
    return 0;
}

What I want my program to do is to add these variables to 3 different arrays, but stop once it reaches the three zero string (0 0 0).

When it compiles, it seems my index value is stopping too soon. Each time it only seems to accumulate to 2 before stopping, rather than stopping once it reaches the marker.

Any ideas on what is going on here?

Your index++ means you're always comparing the junk in your arrays (which are uninitialised, so it's just random what happens), and not comparing the last 3 values read from the file.

I would suggest reading the FAQ on how to use fgets() and sscanf()