Re: nested for loop problem

On 5 Mai, 20:42, notahipee <werldpe...@[EMAIL PROTECTED]
> wrote:
> Would someone be able to tell me why this isn't working. The nested
> for loops seem correctly coded to me. I would appreciate any input.

The algorithm you use for generating the primes is very inefficient.
However, bug fixing your code with minimal changes only, try this one.
It still misidentifies 0 and 1 as prime numbers (enter 0 as start
value...).

#include <iostream>

int main ()
{
	unsigned int a, b;

	std::cout << "Enter two integers ";
	std::cin >> a >> b;

	for ( unsigned int c = a; c <= b; c++ ) {
		bool isprime = true;
		for( unsigned int d = 2; d * d <= c; d++ ) {
			if ( c % d == 0 ) {
				isprime = false;
				break;
			}
		}
		if ( isprime ) std::cout << c << ' ';
	}
	std::cout << "are the prime numbers in the range " << a << " to " <<
b << std::endl;

	return 0;
}