Perfect numbers: Difference between revisions

}

</lang>

=={{header|C++}}==

for gcc/g++

<lang C++>

#include <iostream>

using namespace std ;

bool is_perfect( int ) ;

int main( ) {

cout << "Perfect numbers from 1 to 33550337:\n" ;

for ( int num = 1 ; num < 33550337 ; num++ ) {

if ( is_perfect( num ) )

cout << num << '\n' ;

}

return 0 ;

}

bool is_perfect( int number ) {

int sum = 0 ;

for ( int i = 1 ; i < number + 1 ; i++ )

if ( number % i == 0 )

sum += i ;

return ( ( sum == 2 * number ) || ( sum - number == number ) ) ;