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
|
/*
** STRREV.C - reverse a string in place
**
** public domain by Bob Stout
*/
#include <string.h>
char *strrev(char *str)
{
char *p1, *p2;
if (! str || ! *str)
return str;
for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
{
*p1 ^= *p2;
*p2 ^= *p1;
*p1 ^= *p2;
}
return str;
}
#ifdef TEST
#include <stdio.h>
int main(int argc, char *argv[])
{
while (--argc)
{
printf("\"%s\" backwards is ", *++argv);
printf("\"%s\"\n", strrev(*argv));
}
}
#endif /* TEST */
|
