Radix Sort in C

 A simple radix sort program that I wrote in C programming  thank you to my friend Tom helping me out fixing some bugs in this code.

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Program Listing

radix.c

/* radix.c

   Jake Rodriguez Pomperada,MAED-IT, MIT

   www.jakerpomperada.com   www.jakerpomperada.blogspot.com

   jakerpomperada@gmail.com

   Bacolod City, Negros Occidental */

#define  _CRT_SECURE_NO_WARNINGS // only needed for Visual Studio

#include <stdio.h>

#include <stdlib.h>

static void radixsort(int Array[], int n);

static void countingsort(int Array[], int n, int place);

static void PrintArray(int Array[], int n);

void radixsort(int Array[], int n)

{

int i = 0, place = 0;

int max = Array[0];

for (i = 1; i < n; i++) {

if (max < Array[i])

max = Array[i];

}

for (place = 1; max / place > 0; place *= 10)

countingsort(Array, n, place);

}

static void countingsort(int Array[], int n, int place) {

int i;

int* output = malloc(sizeof(int) * n);

if (output == NULL)

{

fprintf(stderr, "%s", "Out of memory");

return;

}

int freq[10] = { 0 };

for (i = 0; i < n; i++)

freq[(Array[i] / place) % 10]++;

for (i = 1; i < 10; i++)

freq[i] += freq[i - 1];

for (i = n - 1; i >= 0; i--) {

output[freq[(Array[i] / place) % 10] - 1] = Array[i];

freq[(Array[i] / place) % 10]--;

}

for (i = 0; i < n; i++)

Array[i] = output[i];

free(output);

}

static void PrintArray(int Array[], int n) {

    printf("\t");

for (int i = 0; i < n; i++)

printf("%i ", Array[i]);

printf("\n");

}

int main() {

int a = 0, num = 0;

system("cls");

printf("\n\n");

printf("\tRadix Sort Program in C");

printf("\n\n");

printf("\tHow many items? : ");

scanf("%d", &num);

printf("\n\n");

int* b = malloc(sizeof(int) * num);

if (b == NULL)

{

fprintf(stderr, "%s", "Out of memory");

return;

}

for (a = 0; a < num; a++) {

printf("\tEnter item no. %d: ", a + 1);

scanf("%d", &b[a]);

}

printf("\n\n");

printf("\tOriginal Array\n\n");

PrintArray(b, num);

radixsort(b, num);

    printf("\n\n");

printf("\tSorted Array\n\n");

PrintArray(b, num);

free(b);

return 0;

}