/* 使用字符指针数组对字符串进行排序 */
#include <stdio.h>
#define NUM 5

int main(void) {
	char * p[NUM] = { NULL };
	int i, j;
	char * tmp = NULL;

	/* 数组内的有效字符指针个数必须等于NUM */
	p[0] = "Nelson Aldrich";
	p[1] = "A. Piatt Andrew";
	p[2] = "Frank Vanderlip";
	p[3] = "Henry P.Davison";
	p[4] = "Charles D.Norton";

	/* 对数组中的字符串排序 */
	for (i = 0; i < NUM - 1; ++i) {
		for (j = i + 1; j < NUM; ++j) {
			if (0 < strncmp(p[i], p[j])) {
				/* 互换两个指针指向的字符串 */
				tmp = p[i];
				p[i] = p[j];
				p[j] = tmp;
			}
		}
	}

	/* 输出数组中的各字符串 */
	for (i = 0; i < NUM; ++i)
		puts(p[i]);

	return 0;
}