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random_histogram.c
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random_histogram.c
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 20
#define R 10
int a[N];
void gen_random(int upper_bound)
{
int i;
srand(time(NULL));
for (i = 0; i < N; i++)
a[i] = rand() % upper_bound;
}
/*
int howmany(int value)
{
int count = 0, i;
for (i = 0; i < N; i++)
if (a[i] == value)
++count;
return count;
}
int find_max(int p[])
{
int i;
for (i = 1; i < R; i++) {
if (p[0] < p[i])
p[0] = p[i];
}
return p[0];
}
*/
int main(void)
{
int i, j, max, histogram[R] = { 0 };
gen_random(R);
//statistics
for (i = 0; i < N; i++) {
histogram[a[i]]++;
}
//raw data
printf("num\tfreq\t\n");
for (i = 0; i < R; i++) {
printf("%d\t%d\t\n", i, histogram[i]);
}
//find the maxmum
//max = find_max(histogram);
//histogram
printf("\nrandom histogram: \n");
for (i = 0; i < R; i++)
printf("%d\t", i);
printf("\n");
for (j = 0; j < 10; j++) {
for (i = 0; i < R; i++) {
if (histogram[i] > 0) {
printf("*\t");
histogram[i]--;
} else {
printf(" \t");
}
}
printf("\n");
}
return 0;
}