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