Error when reading file using fscanf

Question

I still can't understand why this printf is printing many 0 and the i++ is having no effect

    int i=0;
char datos[5]="";

while((fscanf(entry_file,"%5s",datos))==1)
{
    //Buffer para @
    char x;

    if((strcmp(datos,"DATOS"))==0)
    {
        fscanf(entry_file,"%lf%c%lf%c%lf%c%lf%c%lf%c%lf%c%lf",&cohetes[numCohetes].vuelos[0].aceleracionX[i],&x,&cohetes[numCohetes].vuelos[0].aceleracionY[i],&x,&cohetes[numCohetes].vuelos[0].aceleracionZ[i],
                &x,&cohetes[numCohetes].vuelos[0].altura[i],&x,&cohetes[numCohetes].vuelos[0].potencia[i],&x,&cohetes[numCohetes].vuelos[0].temperatura[i],&x,&cohetes[numCohetes].vuelos[0].tiempo[i]);
        printf("%d\n",i);
        i++;
        datos[0]='\0';
    }

}

Answer 1

Your variable datos is too small, so the ending null character is overwriting i .

Change the decalaration to:

char datos[6]="";