程序清单11.29

/sort_str.c – 读入字符串，并排序字符串/

include

include

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 “” /空字符串停止输入/

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]; /储存输入的数组/
char ptstr[LIM]; /内含指针变量的数组*/
int ct = 0; /输入计数/
int k; /输入计数/

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 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;

}