diff --git a/cl/_testrt/builtin/in.go b/cl/_testrt/builtin/in.go
index b06eec85..e16f2465 100644
--- a/cl/_testrt/builtin/in.go
+++ b/cl/_testrt/builtin/in.go
@@ -25,7 +25,7 @@ func main() {
 	data = append(data, "def"...)
 	println(data)
 	var i any = 100
-	println(true, 100, -100, uint(255), int32(-100), 100.5, i, &i, uintptr(unsafe.Pointer(&i)))
+	println(true, 0, 100, -100, uint(255), int32(-100), 0.0, 100.5, i, &i, uintptr(unsafe.Pointer(&i)))
 	var dst [3]byte
 	n := copy(dst[:], data)
 	println(n, dst[0], dst[1], dst[2])
diff --git a/cl/_testrt/builtin/out.ll b/cl/_testrt/builtin/out.ll
index 1f205311..50204197 100644
--- a/cl/_testrt/builtin/out.ll
+++ b/cl/_testrt/builtin/out.ll
@@ -223,6 +223,8 @@ _llgo_0:
   %96 = ptrtoint ptr %92 to i64
   call void @"github.com/goplus/llgo/internal/runtime.PrintBool"(i1 true)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 0)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 100)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 -100)
@@ -231,6 +233,8 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 -100)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double 0.000000e+00)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double 1.005000e+02)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintIface"(%"github.com/goplus/llgo/internal/runtime.iface" %95)
diff --git a/internal/runtime/llgo_autogen.lla b/internal/runtime/llgo_autogen.lla
index 61566d86..9dba2f3a 100644
Binary files a/internal/runtime/llgo_autogen.lla and b/internal/runtime/llgo_autogen.lla differ
diff --git a/internal/runtime/z_print.go b/internal/runtime/z_print.go
index 2bb01541..4d4ea802 100644
--- a/internal/runtime/z_print.go
+++ b/internal/runtime/z_print.go
@@ -23,19 +23,19 @@ func PrintBool(v bool) {
 }
 
 func PrintFloat(v float64) {
-	switch { // TODO(xsw): does c.Fprintf support these special cases?
+	switch {
 	case v != v:
 		c.Fprintf(c.Stderr, c.Str("NaN"))
 		return
-	case v+v == v:
+	case v+v == v && v != 0:
 		if v > 0 {
 			c.Fprintf(c.Stderr, c.Str("+Inf"))
-		} else if v < 0 {
+		} else {
 			c.Fprintf(c.Stderr, c.Str("-Inf"))
 		}
 		return
 	}
-	c.Fprintf(c.Stderr, c.Str("%g"), v)
+	c.Fprintf(c.Stderr, c.Str("%e"), v)
 }
 
 // func PrintComplex(c complex128) {