#include <iostream>
bool is_prime(int num);
int count_primes_in_range(int start, int end);
int main() {
int start, end;
std::cout << "Enter the range (start and end): ";
std::cin >> start >> end;
int count = count_primes_in_range(start, end);
std::cout << "Number of prime numbers in the given range: " << count << std::endl;
return 0;
}
bool is_prime(int num) {
if (num < 2) {
return false;
}
for (int i = 2; i * i <= num; ++i) {
if (num % i == 0) {
return false;
}
}
return true;
}
int count_primes_in_range(int start, int end) {
int count = 0;
for (int i = start; i <= end; ++i) {
if (is_prime(i)) {
++count;
}
}
return count;
}