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anonymous / gist:3921907
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Perfect number

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#include <iostream>
#include <cmath>
#include <iomanip>
 
using namespace std;
 
bool isAFactor (int, int);
 
int main ()
{
int startVal, endVal, sum = 0;
 
cout << "Enter starting integer: ";
cin >> startVal;
cout << endl;
cout << "Enter ending integer: ";
cin >> endVal;
cout << endl;
 
for (int i = startVal; i <= endVal; i++)
{
for (int j = 1; j <= i/2; j++)
{
if (isAFactor(i,j))
sum += j;
}
 
if (sum == i)
{
cout << i << " is a perfect number." << endl;
}
 
if (sum!= i)
{
cout << "There is no perfect number in this range." << endl;
}
sum = 0;
}
 
cout << endl;
 
system("PAUSE");
return 0;
}
 
bool isAFactor(int a, int b)
{
if ( a % b == 0)
return true;
else
return false;
}

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