f0506.cpp

it is a usefull thing

//=====================================
// f0506.cpp
// 函数指针传递
//=====================================
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
//-------------------------------------
int bitSum(int a);
bool lessThanBitSum(int a, int b){ return bitSum(a)<bitSum(b); }
//-------------------------------------
int main(){
  int a[] = {33, 61, 12, 19, 14, 71, 78, 59};
  vector<int> aa(a, a+8);
  sort(aa.begin(), aa.end(), lessThanBitSum);
  for(int i=0; i<aa.size(); ++i)
    cout<<aa[i]<<" ";
  cout<<"\n";
}//------------------------------------
int bitSum(int a){
  int sum=0;
  for(int x=a; x; x/=10)  sum += x%10;
  return sum;
}//====================================