Thread: Not reading from file after a certain chunk of code

I have recently run into an issue where my program will read some numbers from a file and then stop reading them.

In the next code:

Code:

int A[20];
int B[20];

Code:

for(k=0 ; k < 20 ; k++){
            A[k] = 0;
            B[k] = 0;
        }


        k = 0;      //Reset value of k to 0


            //Take values for set A, this loop reads the numbers on the file correctly
        while(A[k] != (-1)) {
            fscanf(ifp, "%d", &A[k]);
            k++;
        }


        k = 0;      //Reset value of k to 0


            //Take values for set B, no longer reads values from the file, I confirmed that the loop actually works.
        while(B[k] != (-1)) {
            fscanf(ifp, "%d", &B[k]);
            k++;
        }

Reading from the file
3 2 1 5 4 -1
5 8 4 -1
A[] will be 3 2 1 5 4,
but B[] will be 0 0 0 0...

Your loop for A will read all the numbers, since A[k] != -1 must always be true (since at that point A[k] must always be zero, since you initialized them all to zero and you haven't read A[k] yet).

Got it, thanks. I changed the while loops to do-while loops, and the evaluation is now A[k-1] != (-1) for both cases.