Merge pull request #164 from openscad/issue158

Issue158

src/value.cc

@@ -198,7 +198,12 @@ public:
     }
     return tmpstr;
 #else
-    return boost::lexical_cast<std::string>(op1);	
+		// attempt to emulate Qt's QString.sprintf("%g"); from old OpenSCAD.
+		// see https://github.com/openscad/openscad/issues/158
+		std::stringstream tmp;
+		tmp.unsetf(std::ios::floatfield);
+		tmp << op1;
+		return tmp.str();
 #endif
   }
 

testdata/scad/misc/echo-tests.scad

@@ -12,3 +12,7 @@ echo(vec = [1,2,3]);
 echo(range = [0:2]);
 
 echo(str("string generated by str()"));
+
+// https://github.com/openscad/openscad/issues/158 rept by nop head
+// 0.8 should print 0.8 not 0.80000...004 (regardless of internal representation)
+echo(0.8);

tests/regression/echotest/echo-tests-expected.txt

@@ -7,3 +7,4 @@ ECHO: [1 : 2 : 10]
 ECHO: vec = [1, 2, 3]
 ECHO: range = [0 : 1 : 2]
 ECHO: "string generated by str()"
+ECHO: 0.8