#include 
     
      #include 
      
       static void swap(char* pchar1, char* pchar2) {    //交换数组的两个数    char tmp = *pchar1;    *pchar1 = *pchar2;    *pchar2 = tmp;}void permutation(char* pchar, int begin, int length) {    int i;    if(begin == length) {　　//当只剩下一个元素时，打印数组        printf("%s\n", pchar);        return;    }        for(i = begin; i <= length; i++) {        swap(&pchar[begin], &pchar[i]);        permutation(pchar, begin+1, length);        swap(&pchar[begin], &pchar[i]);    }}int main() {    char arr[] = "abc";    permutation(arr, 0, strlen(arr)-1);}