Thread: How to scan in numbers from a file and find the largest?

I'm working on a silent auction program that will scan a file and find the highest from each group of bids, then have a running total of money made throughout the auction. I'm pretty sure the rest of my code works, i'm just getting stuck on finding the largest number from the line in the file, saving it, then moving to the next auction. I hope this is explained clearly, and help would be greatly appreciated!

input file text (first number is num of auctions, after that it's num of bids, then the bids):
5
4
100 500 250 300
1
700
3
300 150 175
2
920 680
8
20 10 15 25 50 30 19 23

Sample Output
Auction 1 sold for $500.00!
Auction 2 sold for $700.00!
Auction 3 sold for $300.00!
Auction 4 sold for $920.00!
Auction 5 sold for $50.00!

The silent auction raised $2470.00 for charity!

Code:

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


int main () {


    FILE * ifp;


    ifp = fopen("bids.txt", "r");


    float winning_bid, sum=0;
    int num_auctions, num_bids, max_bid, next_bid, i;


    fscanf(ifp, "%d", &num_auctions);


     //Loop set up based on the number of auctions
    for (i=0; i<num_auctions; i++) {


        fscanf(ifp, "%d", &num_bids);

       //loop set up based on number of bids
        for (i=0; i<num_bids; i++) {


            fscanf(ifp, "%d", &max_bid);


        //scan in numbers from the list and keep the largest




        //keep a running sum of total made from auctions


        }


    }










}

That helped a lot! My program seems to only run through the first auction though, this is the output:
Auction 1 sold for $100.
Auction 2 sold for $500.
Auction 3 sold for $500.
Auction 4 sold for $500.

I'm guessing my first loops are incorrect?

Code:

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


int main () {


    FILE * ifp;


    ifp = fopen("bids.txt", "r");


    float winning_bid[5];
    int num_auctions, num_bids, max_bid=0, current_bid, next_bid, i, j,sum=0;


    fscanf(ifp, "%d", &num_auctions);


     //Loop set up based on the number of auctions
    for (i=0; i<num_auctions; i++) {


        fscanf(ifp, "%d", &num_bids);


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


            fscanf(ifp, "%d", &current_bid);


                    if (current_bid > max_bid )
                            max_bid = current_bid;




    printf("Auction %d sold for $%d.\n", i+1, max_bid);
        }


        //keep a running sum of total made from auctions






    }










}

You're reusing i as a loop variable, which means the inner loop is destroying the value set by the outer loop. Fixing that will help resolve the initial problem, after which you'll see a couple others which should be easily solvable with a little thinking.