#include <stdio.h>

#include <stdlib.h>

void Permutation(char*a, char*current);

int main()

{

char s[30] = "abcd";

Permutation(s, s);

system("pause");

return 0;

}

void Permutation(char*a, char*current)

{

if (*current == "\0")

printf("%s\n", a);

for (char*next = current; *next != "\0"; next++)

{

char tem = *current;

*current = *next;

*next = tem;

Permutation(a, current + 1);

tem = *current;

*current = *next;

*next = tem;

}

}

執行結果：