Fix issue reported in #230

Author: vincentlaucsb

include/internal/csv_writer.hpp

@@ -114,7 +114,7 @@ namespace csv {
             return std::to_string(value);
 #else
             // TODO: Figure out why the below code doesn't work on clang
-                std::string result;
+                std::string result = "";
 
                 T integral_part;
                 T fractional_part = std::abs(std::modf(value, &integral_part));
@@ -124,8 +124,7 @@ namespace csv {
                 if (value < 0) result = "-";
 
                 if (integral_part == 0) {
-
-                    result = "0";
+                    result += "0";
                 }
                 else {
                     for (int n_digits = num_digits(integral_part); n_digits > 0; n_digits --) {

tests/test_write_csv.cpp

@@ -35,6 +35,12 @@ TEST_CASE("Numeric Converter Tsts", "[test_convert_number]") {
         set_decimal_places(5);
     }
 
+    SECTION("Decimal Numbers x where -1 < x < 0") {
+        REQUIRE(csv::internals::to_string(-0.25) == "-0.25000");
+        REQUIRE(csv::internals::to_string(-0.625) == "-0.62500");
+        REQUIRE(csv::internals::to_string(-0.666) == "-0.66600");
+    }
+
     SECTION("Numbers Close to 10^n - Regression") {
         REQUIRE(csv::internals::to_string(10.0) == "10.0");
         REQUIRE(csv::internals::to_string(100.0) == "100.0");