-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.c
63 lines (58 loc) · 1.7 KB
/
main.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
#include <stdio.h>
#include <string.h>
#define SIZE 81 /*string length limit, including \0 */
#define LIM 20 /*maximum number of lines to be read */
#define HALT "" /*null string to stop input */
void stsrt(char *strings[], int num); /*string-sort function */
char *s_gets(char *st, int n);
int main(void)
{
char input[LIM][SIZE]; /*array to store input */
char *ptstr[LIM]; /*array of pointer variables */
int ct = 0; /*input count */
int k; /*output count */
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]; /*set ptrs to strings */
ct++;
}
stsrt(ptstr, ct); /*string sorter */
puts("\nHere's the sorted list:\n");
for (k = 0; k < ct; k++)
puts(ptstr[k]); /*sorted pointers */
return 0;
}
/*string-pointer-sorting function */
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 // must have words[i] == '\0'
while (getchar() != '\n')
continue;
}
return ret_val;
}