Why is my programme not reading from the textfile?

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C

Hi everyone, my program doesnt seem to be reading from the textfile raw.txt which i placed in the same directory as the .exe file. Does anyone know why? i have used this function before and it worked in another program. but now when i printf whats in the array a[], all i get is zeros and rubbish values. Pls help me! im desperate!

i got a debug error, run-time check failure #@ - stack aorund the variable 'time' was corrupted.

int main()
{
int channel, maxdatapoints ,size1=0 ,i=0 ,k=0 ,j=0 , totalsize=0 ;
int time;
int ans,f, maxf=0 ,maxf2=0 ,maxans2=0 ,maxans=0 ;
double *a,*temp ,*diff,x;
FILE *fread, *histogramw, *histogramr,*result;
        int  frequency=0; /*initialise the frequency of a variable, and the variable x*/


    printf("Enter the maximum number of data points to compute \n");
    scanf("%d", &maxdatapoints);


    a=(double *)calloc(maxdatapoints,sizeof(double));

        if ((fread = fopen("raw.txt", "r")) == NULL)
        {
            printf("Cannot open %s\n", "raw.txt");
            exit(EXIT_FAILURE);
        }



            while (!feof(fread) && i<maxdatapoints)
            { /*Read the output file*/
                fscanf(fread, "%lf %*c %d\n", &time, &channel);

                /*If channel 1, write that to channel1.txt*/
                if(channel==1)
                {
                    a[i]=time;

                size1=size1+1;
                    i=i+1;

                printf("%lf \n", a[i]);

                }
            }

    fclose(fread);