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// Compute the sum of the first n natural numbers.
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int main()
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std::cout << "Compute the sum 1+...+n for n =? ";
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// Test if a given natural number is prime.
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#include <iostream>
int main ()
{
// Input
unsigned int n;
std::cout << "Test if n>1 is prime for n =? ";
std::cin >> n;
// Computation: test possible divisors d
unsigned int d;
for (d = 2; n % d != 0; ++d);
// Output
if (d < n)
// d is a divisor of n in {2,...,n-1}
std::cout << n << " = " << d << " * " << n / d << ".\n";
else
// no proper divisor found
std::cout << n << " is prime.\n";
return 0;
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// n is even
n = n / 2;
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std::cout << "next number =? ";
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