fix(printf): fix floating point precision limit

Return the correct count of precision digits now. Fixes #22

1 files changed, 11 insertions, 1 deletions

diff --git a/test/test_suite.cpp b/test/test_suite.cpp
index 3d7c10d..212fbd3 100644
--- a/test/test_suite.cpp
+++ b/test/test_suite.cpp
@@ -933,7 +933,17 @@ TEST_CASE("float", "[]" ) {
   REQUIRE(!strcmp(buffer, "42.895200000"));

 

   test::sprintf(buffer, "%.10f", 42.895223);

-  REQUIRE(!strcmp(buffer, "42.895223000"));

+  REQUIRE(!strcmp(buffer, "42.8952230000"));

+

+  // this testcase checks, that the precision is truncated to 9 digits.

+  // a perfect working float should return the whole number

+  test::sprintf(buffer, "%.12f", 42.89522312345678);

+  REQUIRE(!strcmp(buffer, "42.895223123000"));

+

+  // this testcase checks, that the precision is truncated AND rounded to 9 digits.

+  // a perfect working float should return the whole number

+  test::sprintf(buffer, "%.12f", 42.89522387654321);

+  REQUIRE(!strcmp(buffer, "42.895223877000"));

 

   test::sprintf(buffer, "%6.2f", 42.8952);

   REQUIRE(!strcmp(buffer, " 42.90"));