36 lines
872 B
C++
36 lines
872 B
C++
#include<iostream>
|
|
#include<string>
|
|
#include<sstream>
|
|
|
|
int main()
|
|
{
|
|
std::string input;
|
|
unsigned long long max;
|
|
|
|
std::cout << "Geben sie an bis zu welcher Zahl nach befreundeten Zahlen gesucht werden soll: ";
|
|
|
|
getline(std::cin, input);
|
|
std::stringstream(input) >> max;
|
|
|
|
if(max<284)
|
|
{
|
|
std::cout << "\nEs wurden keine befreundeten Zahlen gefunden.";
|
|
getchar();
|
|
return(0);
|
|
}
|
|
|
|
std::cout << "\nbefreundete Zahlen sind:\n";
|
|
|
|
for(unsigned long long number = 284; number<=max; number++)
|
|
{
|
|
unsigned long long sum = 0, sum2 = 0;
|
|
|
|
for(unsigned long long factor = 1; factor*2<=number; factor++) if(number%factor==0) sum += factor;
|
|
|
|
if(sum<number && sum>=220) for(unsigned long long factor = 1; factor*2<=sum; factor++) if(sum%factor==0) sum2 += factor;
|
|
if(sum2==number) std::cout << sum << " und " << sum2 << "\n";
|
|
}
|
|
|
|
getchar();
|
|
return(0);
|
|
}
|