字符串示例

/*sort_str.c -- 输入字符串，并排序字符串 */
#include <stdio.h>
#include <string.h>
#define SIZE 81 /* 限制字符串长度，包括 \0 */
#define LIM 20 /* 可读入的最多行数 */
#define HALT ""  /* 空字符停止输入 */
void stsrt(char *strings[], int num);     /*字符串排序函数*/
char *s_gets(char *st, int n);
int main(void)
{
	char input[LIM][SIZE];      /*存储输入的数组*/
	char *ptstr[LIM];         /*含有指针变量的数组*/
	int ct = 0;         /*输入计数*/
	int k;              /*输出计数*/
	printf("Input up to %d lines, and i will sort them.\n", LIM);
	printf("To stop,press the Enter key at a line's start.\n");
	while (ct < LIM&&s_gets(input[ct], SIZE) != NULL&& input[ct][0] != '\0')
	{
		ptstr[ct] = input[ct];             /*设置指针指向字符串*/
		ct++;

	}
	stsrt(ptstr, ct);                   /*字符串排序函数*/
	puts("\nHere's the sorted list:\n");
	for (k = 0; k < ct; k++)
	{
		puts(ptstr[k]);    /* 排序后的指针   */
	}

	return 0;
}
	/*字符串-指针-排序函数*/
void stsrt(char *strings[], int num)
{
	char *temp;
	int top, seek;

	for (top = 0; top < num - 1; top++)
	{
		for (seek = top + 1; seek < num; seek++)
		{
			if (strcmp(strings[top], strings[seek]) > 0)
			{
				temp = strings[top];
				strings[top] = strings[seek];
				strings[seek] = temp;
			}
		}
	}
}
char *s_gets(char *st, int n)
{
	char *ret_val;
	int i = 0;

	ret_val = fgets(st, n, stdin);
	if (ret_val)
	{

		while (st[i]!='\n'&&st[i]!='\0')
		{
			i++;

		}
		if (st[i]=='\n')
		{
			st[i] = '\0';
		}
		else
		{
			while (getchar()!='\n')
			{
				continue;
			}

		}
		return ret_val;
	}



}