sort_words.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAXWORD 50
#define N 1000

void sort_words(char *[],int);
void swap(char **, char **);

int main(void){
	char *(w[N]); /* an array of points to char */
	char word[MAXWORD];
	int n;
	int i;

	for (i =0; scanf("%s", word) == 1; ++i){
		if (i >= N){
			printf("Sorry, at most %d words can be sorted.", N);
			exit(1);
		}
		w[i] = calloc(strlen(word) + 1, sizeof(char));
		strcpy(w[i], word);
	}
	n = i;
	sort_words(w, n);
	for (i = 0; i < n; ++i){
		printf("%s\n", w[i]);
	}
	return 0;
}

void sort_words(char *w[], int n){
	int i, j;

	for (i =0; i < n; ++i)
		for (j = i +1; j < n; ++j)
			if (strcmp(w[i],w[j]) > 0)
				swap(&w[i],&w[j]);
}

void swap(char **p, char **q){
	char *tmp;

	tmp = *p;
	*p = *q;
	*q = tmp;
}