documentation and bug fixes

math/prime_numbers.cpp

@@ -1,26 +1,33 @@
+/**
+ * @file
+ * @brief Get list of prime numbers
+ * @see primes_up_to_billion.cpp sieve_of_eratosthenes.cpp
+ */
 #include <iostream>
 #include <vector>
 
+/** Generate an increasingly large number of primes
+ * and store in a list
+ */
 std::vector<int> primes(int max) {
     max++;
     std::vector<int> res;
     std::vector<bool> numbers(max, false);
     for (int i = 2; i < max; i++) {
         if (!numbers[i]) {
-            for (int j = i; j < max; j += i)
-                numbers[j] = true;
+            for (int j = i; j < max; j += i) numbers[j] = true;
             res.push_back(i);
         }
     }
     return res;
 }
 
+/** main function */
 int main() {
     std::cout << "Calculate primes up to:\n>> ";
     int n;
     std::cin >> n;
     std::vector<int> ans = primes(n);
-    for (int i = 0; i < ans.size(); i++)
-        std::cout << ans[i] << ' ';
+    for (int i = 0; i < ans.size(); i++) std::cout << ans[i] << ' ';
     std::cout << std::endl;
 }