Wagstaff primes: Difference between revisions

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@@ Line 347: / Line 347: @@
 using big_int = mpz_class;
-std::string to_string(const big_int& num, size_t n) {
+std::string to_string(const big_int& num, size_t max_digits) {
     std::string str = num.get_str();
     size_t len = str.size();
-    if (len > n) {
+    if (len > max_digits) {
-        str = str.substr(0, n / 2) + "..." + str.substr(len - n / 2);
+        str.replace(max_digits / 2, len - max_digits, "...");
         str += " (";
         str += std::to_string(len);