radix_sort.c

#include <stdio.h>

int largest(int a[], int n)
{
    int large = a[0], i;
    for (i = 1; i < n; i++)
    {
        if (large < a[i])
            large = a[i];
    }
    return large;
}

void RadixSort(int a[], int n)
{
    int bucket[10][10], bucket_count[10];
    int i, j, k, remainder, NOP = 0, divisor = 1, large, pass;

    large = largest(a, n);
    printf("The large element %d\n", large);
    while (large > 0)
    {
        NOP++;
        large /= 10;
    }

    for (pass = 0; pass < NOP; pass++)
    {
        for (i = 0; i < 10; i++)
        {
            bucket_count[i] = 0;
        }
        for (i = 0; i < n; i++)
        {
            remainder = (a[i] / divisor) % 10;
            bucket[remainder][bucket_count[remainder]] = a[i];
            bucket_count[remainder] += 1;
        }

        i = 0;
        for (k = 0; k < 10; k++)
        {
            for (j = 0; j < bucket_count[k]; j++)
            {
                a[i] = bucket[k][j];
                i++;
            }
        }
        divisor *= 10;

        for (i = 0; i < n; i++) printf("%d  ", a[i]);
        printf("\n");
    }
}

int main()
{
    int i, n, a[10];
    printf("Enter the number of elements :: ");
    scanf("%d", &n);
    printf("Enter the elements :: ");
    for (i = 0; i < n; i++)
    {
        scanf("%d", &a[i]);
    }
    RadixSort(a, n);
    printf("The sorted elements are ::  ");
    for (i = 0; i < n; i++) printf("%d  ", a[i]);
    printf("\n");
    return 0;
}