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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">#define MAX_DIGIT 3 <i><font size="3" color="#CC0099"> /* number between 0 and 999 */</font></i>
#define RADIX_SIZE 10
typedef struct list_node *list_pointer;
typedef struct <font color="#FF0000">list_node</font> {
int key[MAX_DIGIT];
list_pointer link;
};
list_pointer <font color="#FF0000">radix_sort </font>(list_pointer ptr)
<i><font size="3" color="#CC0099">/* radix sort using a linked list ( LSD radix sort) */</font></i>
{
list_pointer front [RADIX_SIZE], rear[RADIX_SIZE];</font></b></pre>
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<pre><b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"> int i,j,digit;
for (i = MAX_DIGIT-1; i >= 0; i--){
for (j = 0;j < RADIX_SIZE; j++)
front[j] = rear[j] = NULL;
while (ptr){
digit = ptr->key[i];
if ( !front[digit])
front[digit] = ptr;
else
rear[digit]->link = ptr;
rear[digit] = ptr;
ptr = ptr->link;
}</font></b></pre>
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<pre align="left"><b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><i><font size="3" color="#CC0099">* reestablish the linked list for the next pass */
</font></i><font size="3" color="#CC0099"><font size="4" color="#000000"> ptr = NULL;</font></font>
for (j = RADIX_SIZE-1; j >= 0; j--)
if ( front[j]){
rear[j]->link = ptr; ptr = front[j];
}
}
return ptr;
}
</font></b></pre>
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