The Shell Sort
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
void shell(char *items, int count)
{
register int i, j, gap, k;
char x, a[5];
a[0]=9; a[1]=5; a[2]=3; a[3]=2; a[4]=1;
for(k=0; k < 5; k++) {
gap = a[k];
for(i=gap; i < count; ++i) {
x = items[i];
for(j=i-gap; (x < items[j]) && (j >= 0); j=j-gap)
items[j+gap] = items[j];
items[j+gap] = x;
}
}
}
int main(void)
{
char s[255];
printf("Enter a string:");
gets(s);
shell(s, strlen(s));
printf("The sorted string is: %s.\n", s);
return 0;
}Enter a string:3
The sorted string is: 3.
