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#include"stdafx.h"
#include<iostream>
#include<math.h>
using namespace std;
int Convert(int num)
{
int ReturnNum = 0, step = 0, temp;
while(num != 0)
{
temp = num % 10;
ReturnNum += temp * pow(7, step++);
num = num / 10;
}
return ReturnNum;
}
int main()
{
int num;
cout << "Input a num:";
cin >> num;
cout << "The dec num is:" << Convert(num) << endl;
return 0;
}