c++ - call a function recusively and store it into an int gives me 1? -

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this code runs fine , used find largest factor between 2 numbers, wanted know why num prints out (for example 1 1 1 3 @ end of program). confused why can store function int , number? why give 1? 

#include <iostream>  using namespace std;  int largestfactor(int number, int start) {   if(start == number)    return 1;   int num = largestfactor(number, start+1);   cout << num;   if (num ==1 && number % start == 0)    return start;   return num;   }  int main() {   largestfactor(6,2);  }


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