一个小算法

#include <functional>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <utility>
#include <cctype>
#include <vector>
#include <string>
#include <bitset>
#include <cmath>
#include <queue>
#include <stack>
#include <ctime>
#include <list>
#include <map>
#include <set>

using namespace std;

vector<int> ans;
bool found=false;

void factor(long m)
{
    int i = 2;

    while( m != 1 )
    {
        if( m % i == 0 ){
            m /= i;
            printf("%ld*",i);
        }
        else{
            i++;
        }
    }
}

int main()
{
    long n;
    int i=0;
    while(scanf("%ld",&n)!=EOF&&n!=0)
    {
        printf("%ld=", n);
        factor(n);
        printf("\b \n");
    }
    return 0;
}