求字符串的所有子字符串

#include<iostream>
using namespace std;

char str[] = "hart";
char *out;
int length;
int rec = 0;

void DoCombine(char in[],char out[],int len,int rec,int start)
{
 for (int i=start;i<len;i++)
 {
  out[rec] = in[i];
  out[rec+1] = 0;
  printf("%s",out);
  printf("/n");
  if (i < len-1)
  {
   DoCombine(in,out,len,rec+1,start+1);
  }
  start++;
 } 
}


int main(void)
{
 int length = strlen(str);
 out = (char*) malloc (sizeof(char) * length + 1);
 printf("output the substring :/n");
 DoCombine(str,out,length,0,0);
 return 0;
}

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