问按数字排序数字

EN

#include <stdlib.h>
#include <iostream>
#include <string.h>
void Sort(int *arr,int length){
    int *iter=arr;
    char buf[12],buf1[12];
     while ((iter++)< (arr+length)){

          if (iter==arr || (strcmp(itoa(*iter,buf,10),itoa(*(iter-1),buf1,10))>=0)){
       iter++;
          }
          else{
              *iter^=*(iter+1);
              *(iter+1)^=*iter;
              *iter^=*(iter+1);
              iter--;
          }

          }


     }

     int main(){

         int a[]={1,2,10,100,19,21,2,4,31};
         int n=sizeof(a)/sizeof(int);
         Sort(a,n);
          for(int i=0;i<n;i++)
            std::cout<<a[i]<<"  ";




          return 0;
     }