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/********************************************************
* hist -- generate a histogram of an array of numbers *
* *
* Usage *
* hist <file> *
* *
* Where *
* file is the name of the file to work on *
********************************************************/
#include "ia.h"
#include <stdio.h>
#include <stdlib.h> /* ANSI Standard only */
#include <mem.h>
/*
* the following definitions define the histogram
*/
#define NUMBER_OF_LINES 50
#define LOW_BOUND 0.0
#define HIGH_BOUND 99.0
/*
* if we have NUMBER_OF_LINES data to
* output then each item must use
* the following factor
*/
#define FACTOR \
((HIGH_BOUND - LOW_BOUND) / ((float) (NUMBER_OF_LINES-1)))
/* number of characters wide to make the histogram */
#define WIDTH 60
static struct infinite_array data_array;
static int data_items;
main(int argc, char *argv[])
{
void read_data(char *); /* get the data into the array */
void print_histogram(void);/* print the data */
if (argc != 2) {
(void) fprintf(stderr,
"Error:Wrong number of arguments\n");
(void) fprintf(stderr,
"Usage is:\n");
(void) fprintf(stderr,
" hist <data-file>\n");
exit(8);
}
ia_init(&data_array);
data_items = 0;
read_data(argv[1]);
print_histogram();
return (0);
}
/********************************************************
* read_data -- read data from the input file into *
* the data_array. *
* *
* Parameters *
* name -- the name of the file to read *
********************************************************/
void read_data(char *name)
{
char line[100]; /* line from input file */
FILE *in_file; /* input file */
float data; /* data from input */
in_file = fopen(name, "r");
if (in_file == NULL) {
(void) fprintf(stderr,
"Error:Unable to open %s\n", name);
exit(8);
}
while (1) {
if (fgets(line, sizeof(line), in_file) == NULL)
break;
if (sscanf(line, "%f", &data) != 1) {
(void) fprintf(stderr,
"Error: Input data not floating point number\n");
(void) fprintf(stderr, "Line:%s", line);
}
ia_store(&data_array, data_items, data);
data_items++;
}
fclose(in_file);
}
/********************************************************
* print_histogram -- print the histogram output. *
********************************************************/
void print_histogram(void)
{
/* upper bound for printout */
int counters[NUMBER_OF_LINES];
float low; /* lower bound for printout */
int out_of_range = 0;/* number of items out of bounds */
int max_count = 0;/* biggest counter */
float scale; /* scale for outputting dots */
int index; /* index into the data */
(void) memset((char *) counters, '\0', sizeof(counters));
for (index = 0; index < data_items; index++) {
float data;/* data for this point */
data = ia_get(&data_array, index);
if ((data < LOW_BOUND) || (data > HIGH_BOUND))
out_of_range++;
else {
/* index into counters array */
int count_index;
count_index = (data - LOW_BOUND) / FACTOR;
counters[count_index]++;
if (counters[count_index] > max_count)
max_count = counters[count_index];
}
}
scale = ((float) max_count) / ((float) WIDTH);
low = LOW_BOUND;
for (index = 0; index < NUMBER_OF_LINES; index++) {
/* index for outputting the dots */
int char_index;
int number_of_dots; /* number of * to output */
(void) printf("%2d:%3.0f-%3.0f (%4d): ",
index, low, low + FACTOR -1,
counters[index]);
number_of_dots = (int) (((float) counters[index]) / scale);
for (char_index = 0; char_index < number_of_dots;
char_index++)
(void) printf("*");
(void) printf("\n");
low += FACTOR;
}
(void) printf("%d items out of range\n", out_of_range);
}
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