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Tuesday, 4 November 2014

C Program on Radix Sort

   #include <stdio.h>
   #define MAX 100
   #define SHOWPASS
   void print(int *a, int n)
   {
     int i;
     for (i = 0; i < n; i++)
     printf("%d\t;", a[i]);
   }
   void radix_sort(int *a, int n)
   {
     int i, b[MAX], m = 0, exp = 1;
     for (i = 0; i < n; i++)
     {
       if (a[i] > m)
       m = a[i];
     }
     while (m / exp > 0)
     {
       int box[10] = { 0 };
       for (i = 0; i < n; i++)
       box[a[i] / exp % 10]++;
       for (i = 1; i < 10; i++)
       box[i] += box[i - 1];
       for (i = n - 1; i >= 0; i--)
       b[--box[a[i] / exp % 10]] = a[i];
       for (i = 0; i < n; i++)
       a[i] = b[i];
       exp *= 10;
       #ifdef SHOWPASS
       printf("\n\nPASS : ");
       print(a, n);
       #endif
     }
   }
   int main()
   {
     int arr[MAX];
     int i, num;
     printf("\nEnter total elements (num < %d) : ", MAX);
     scanf("%d", &num);
     printf("\n Enter %d Elements : ", num);
     for (i = 0; i < num; i++)
     scanf("%d", &arr[i]);
     printf("\n ARRAY : ");
     print(&arr[0], num);
     radix_sort(&arr[0], num);
     printf("\n\n SORTED : ");
     print(&arr[0], num);
     return 0;
   }   

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