全排列算法

#include <stdio.h>
#define swap(a,b){long temp=*a;*a=*b;*b=temp;}

void Permutation(char* pStr, char* pBegin)
{
    if(!pStr || !pBegin)
        return;

    if(*pBegin == 0)
    {
        printf("%s\n",pStr);
    }
    else
    {
        for(char* pCh = pBegin; *pCh != ‘\0‘; pCh++)
        {
            // swap pCh and pBegin    
            swap(pCh,pBegin);
            //printf("--%s-----%s\n",pCh,pBegin);

            Permutation(pStr, pBegin + 1);
            // restore pCh and pBegin    
            swap(pCh,pBegin);
            //printf("++%s-----%s\n",pCh,pBegin);
        }
    }
}

void main(){
        char str[] ={‘a‘,‘b‘,‘c‘,‘\0‘};
        char *p=str;
        Permutation(p, p);
}

[root@chenpingzhao code]# gcc -o cs cs.c -std=c99
[root@chenpingzhao code]# ./cs
abc
acb
bac
bca
cba
cab