Fix Default for floating type

Author: lucic71

cpp2rust/converter/converter.cpp

@@ -2604,7 +2604,7 @@ void Converter::ConvertIntegralToBooleanCast(clang::ImplicitCastExpr *expr) {
   PushParen paren(*this);
   Convert(sub_expr);
   StrCat(token::kDiff);
-  StrCat(token::kZero);
+  StrCat(sub_expr->getType()->isFloatingType() ? "0.0" : "0");
   computed_expr_type_ = ComputedExprType::FreshValue;
 }
 

tests/unit/expr_as_bool_cpp.cpp

@@ -55,5 +55,16 @@ int main() {
   assert(both_null(nullptr, nullptr) == 1);
   assert(both_null(p1, nullptr) == 0);
 
+  double d = 0.5;
+  int taken = 0;
+  if (d) {
+    taken = 1;
+  }
+  assert(taken == 1);
+  while (d) {
+    d = 0.0;
+  }
+  assert(d == 0.0);
+
   return 0;
 }