Thread: Segmentation fault: 11?

I'm getting a segmentation fault:11 after I run the code. I'm new to programming and not sure what the fault is. Any help would be appreciated.

My code is:

Code:

# include <stdio.h>
# include <stdlib.h>
# include <time.h>




 //main function
int main() {
    int i, x;
    int num_bids;
    int num_auctions;


    float bid;
    float max;
    float sum = 0;




    //open input file
    FILE * ifp = fopen("/Users/ninagonzalez/Desktop/COP3223/bids.txt" , "r");
    //open output file
    FILE * ofp = fopen("/Users/ngonzalez/Desktop/output.txt" , "w");
    //scan in info
    fscanf(ifp, "%d" , &num_auctions);


    for(i=0; i<num_auctions; i++){


        fscanf(ifp, "%d",&num_bids);
            for (x = 0; x < num_bids;x++)


            {


            fscanf(ifp, "%d", &num_bids);
            max = bid;


            }




        for(i=1; i<num_auctions; i++)
            if (bid>max)
            max = bid;


    }


    max=0;


    //sum
    sum += bid;


     // print out to the output
    fprintf(ofp,"Auction 1 was sold for $%.2f\n", bid);
    fprintf(ofp,"Auction 2 was sold for $%.2f\n", bid);
    fprintf(ofp,"Auction 3 was sold for $%.2f\n", bid);
    fprintf(ofp,"Auction 4 was sold for $%.2f\n", bid);
    fprintf(ofp,"Auction 5 was sold for $%.2f\n", bid);
    fprintf(ofp, "The total made for charity is $%.2f ", bid);
    // close
    fclose(ifp);
    fclose(ofp);






return 0;


}

Well I posted that post pre-maturly I found the error. But the auctions are not adding up?

For one you're using 'bid' without ever setting it or initializing it. I'm guessing you're supposed to read that in somewhere at some point?
The whole thing is a bit shaky inherently though due to the nature of the repeated fscanf() inside loops and no error checking.

You want to ensure that you're fscanf() calls are actually succeeding (at the very least) but really I would suggest using the classic fgets()+sscanf() pair for parsing this kind of data.