c program for radix sort
#include<stdio.h>
int get_max (int a[], int n)
{
int max = a[0];
for (int i = 1; i < n; i++)
if (a[i] > max)
max = a[i];
return max;
}
void radix_sort (int a[], int n)
{
int bucket[10][10], bucket_cnt[10];
int i, j, k, r, NOP = 0, divisor = 1, lar, pass;
lar = get_max (a, n);
while (lar > 0)
{
NOP++; // No of passes
lar /= 10; // largest number
}
for (pass = 0; pass < NOP; pass++)
{
for (i = 0; i < 10; i++)
{
bucket_cnt[i] = 0;
}
for (i = 0; i < n; i++)
{
r = (a[i] / divisor) % 10;
bucket[r][bucket_cnt[r]] = a[i];
bucket_cnt[r] += 1;
}
i = 0;
for (k = 0; k < 10; k++)
{
for (j = 0; j < bucket_cnt[k]; j++)
{
a[i] = bucket[k][j];
i++;
}
}
divisor *= 10;
printf ("After pass %d : ", pass + 1);
for (i = 0; i < n; i++)
printf ("%d ", a[i]);
printf ("\n");
}
}
int main ()
{
int i, n, a[10];
printf ("Enter the number of items to be sorted: ");
scanf ("%d", &n);
printf ("Enter items: ");
for (i = 0; i < n; i++)
{
scanf ("%d", &a[i]);
}
radix_sort (a, n);
printf ("Sorted items : ");
for (i = 0; i < n; i++)
printf ("%d ", a[i]);
printf ("\n");
return 0;
}