Thread: Counting number from a random file

ok I understand most of the program... and what you did...
but can you explain to me how these 2 part works??

Code:

      
        ranges[rand_value / 100]++;

Code:

    for (i = 0; i < 10; i++) {
        int lower = i * 100;
        int upper = (i + 1) * 100;
        printf("Number Records %03d-%03d: %d\n", lower, upper, ranges[i]);
        fprintf(fp, "Number Records %03d-%03d: %d\n", lower, upper,
                ranges[i]);

ok... I see what you did now...
it was to set the upper and lower limits...
Just one final question...
is it possible to use like a quick sort or a bubble sort for the random list??

thank you so much by the way....
I started programming like a little bit more than 2 and half weeks ago...
So I am still new to this whole programming thing....

ok I searched the forum... and followed some of the examples... but somehow it only prints out a list of 0....

heres what I did:

Code:

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

#define DATA_FILE "test_data.txt"

void initializeRandom(void);    /* programmer written functions - prototypes */
int getRandom(int maximum_value);
int compare( void *a, void *b )
{
  return ( a, b );
}

int main(void)
{
    int ranges[10]    = { 0 };
    int rand_value    = 0;
    int max           = 0;
    int min           = 1000;
    int user_input    = 0;
    int i             = 0, n=0;
    int number_values = 0;
    int array[999]   = {number_values};

    char id_string[8];          /* 7 characters for the ID# + 1 for \0 */

    FILE *fp;

    /* 1.  Get user input */
    printf("Enter your colleague ID # --> ");
    scanf("%d", &user_input);
    fp = fopen(DATA_FILE, "w");

    /* Generate a string out of the value inputted by user */
    sprintf(id_string, "%07d", user_input);
    number_values = atoi(&id_string[4]);
    initializeRandom();

    fprintf(fp, "This is the number of values: %d\n", number_values);
    printf("This is the number of values: %d\n", number_values);
    fprintf(fp, "This is the list\n");
    printf("This is the list\n");

  for (i = 0; i < number_values; i++)
 {
    rand_value = getRandom(999);
    fprintf(fp, "%d\n", rand_value);
    printf("%d\n", rand_value);

  if (rand_value > max)
  {
    max = rand_value;
  }
  if (rand_value < min)
  {
    min = rand_value;
  }
    ranges[rand_value / 100]++;
 }
  printf("The sorted list is:\n");
  qsort(rand_value, number_values, number_values, compare);
  for ( i=0; i<number_values; i++ )

  printf( "%d\n", array[i] );

  if (max > 0)
  {
    printf("this is the max value %d\n", max);
    fprintf(fp, "this is the max value %d\n", max);
  }
  if (min > 0)
  {
    printf("this is the min value %d\n", min);
    fprintf(fp, "this is the min value %d\n", min);
  }

  for (i = 0; i < 10; i++)
  {
    int lower = i * 100;
    int upper = (i + 1) * 100;
    printf("Number Records %03d-%03d: %d\n", lower, upper, ranges[i]);
    fprintf(fp, "Number Records %03d-%03d: %d\n", lower, upper,
    ranges[i]);
  }
    fclose(fp);
    system("pause");
    return (0);
}


/* Call this function to start random number generation, */
/* else every time you run you'll get the same answers - ONLY CALL 1 time */
void initializeRandom(void)
{
    srand((unsigned) time(NULL));
}

/* get a random number between 1 and maximum_value passed in */
int getRandom(int maximum_value)
{
    int random = 0;
    random = rand();
    /* Modulus gives you a value between 0 and 1 less */
    /* then number dividing by, so add 1 to shift */
    random = (random % maximum_value) + 1;
    return (random);
}

help please????

thank you so much!!!
Only one question though...
how does this part works??

Code:

int compare( const void *a, const void *b )
{
   const int *x = a, *y = b;
   return *x > *y ? 1 : *x < *y ? -1 : 0;
}

I know we are comparing the two... but I dont understand why it return x> y and so on...

oh cool... is that also part of c too???

oh ok...
Thank you all so much... I learned so much just by doing this one program... hehehehe
Thanks for the help...