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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void swap_chr(char*, char*);
void p(char *, size_t, size_t);
void die_help(const char*);
int main(int argc, char **argv)
{
if (argc != 2)
die_help(argv[0]);
p(argv[1], strlen(argv[1]), 0);
return 0;
}
void die_help(const char* argv0) {
fprintf(stderr, "Usage: %s <word>\n", argv0);
exit(1);
}
void swap_chr(char *a, char *b) {
char t = *a;
*a = *b;
*b = t;
}
void p(char *string, size_t x, size_t i) {
size_t j = 0;
if (i == x) {
puts(string);
return;
}
for (j = i; j < x; j++) {
swap_chr(&string[i], &string[j]);
p(string, x, i+1);
swap_chr(&string[i], &string[j]);
}
}
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