Use Uppercase Exponents in UDQDefine::input_string

Needed for compatibility reasons.

src/opm/input/eclipse/Schedule/UDQ/UDQToken.cpp

@@ -16,20 +16,25 @@
   You should have received a copy of the GNU General Public License
   along with OPM.  If not, see <http://www.gnu.org/licenses/>.
 */
-#include <fmt/format.h>
-#include <numeric>
 
 #include <opm/input/eclipse/Schedule/UDQ/UDQToken.hpp>
 
-namespace Opm {
+#include <numeric>
+#include <string>
+#include <variant>
+#include <vector>
+
+#include <fmt/format.h>
 
 namespace {
-std::string format_double(double d) {
-    return fmt::format("{:g}", d);
-}
-}
-
+    std::string format_double(const double d)
+    {
+        // Use uppercase exponents for restart file compatibility.
+        return fmt::format("{:G}", d);
+    }
+} // namespace anonymous
 
+namespace Opm {
 
 UDQToken::UDQToken(const std::string& string_token, UDQTokenType token_type_) :
     token_type(token_type_)
@@ -74,5 +79,4 @@ std::string UDQToken::str() const {
         return format_double(std::get<double>(this->m_value));
 }
 
-
-}
+} // namespace Opm

tests/parser/UDQTests.cpp

@@ -1290,6 +1290,25 @@ BOOST_AUTO_TEST_CASE(UDQPARSE_TEST1) {
     BOOST_CHECK_EQUAL( def2.input_string() , "2 * (1 + WBHP)");
 }
 
+BOOST_AUTO_TEST_CASE(INPUT_STRING_SCIENTIFIC_NOTATION) {
+    const auto schedule = make_schedule(R"(
+SCHEDULE
+UDQ
+DEFINE FU_THREE (3000000 + FU_ONE*1500000 + 1000000*FU_TWO)/365 /
+/
+)");
+
+    const auto& udq = schedule.getUDQConfig(0);
+    const auto def = udq.definitions();
+
+    BOOST_CHECK_EQUAL(def.size(), 1ULL);
+
+    const auto expect_input_string = std::string {
+        "(3E+06 + FU_ONE * 1.5E+06 + 1E+06 * FU_TWO) / 365"
+    };
+
+    BOOST_CHECK_EQUAL(def[0].input_string(), expect_input_string);
+}
 
 BOOST_AUTO_TEST_CASE(UDQ_PARSE_ERROR) {
     UDQParams udqp;