First 9 prime Fibonacci number: Difference between revisions

Content added Content deleted

Inline

@@ Line 445: / Line 445: @@
 <syntaxhighlight lang="cpp">#include <chrono>
 #include <iostream>
-#include <sstream>
 #include <utility>
 #include <primesieve.hpp>
@@ Line 497: / Line 496: @@
 std::string to_string(const big_int& n) {
     std::string str = n.get_str();
-    if (str.size() > 40) {
+    size_t len = str.size();
+    if (len > 40) {
-        std::ostringstream os;
-        os << str.substr(0, 20) << "..." << str.substr(str.size() - 20) << " ("
+        str.replace(20, len - 40, "...");
-           << str.size() << " digits)";
+        str += " (";
-        return os.str();
+        str += std::to_string(len);
+        str += ")";
     }
     return str;