diff --git a/samples/helloworld.ks b/samples/helloworld.ks
index 2acc79b..b334adf 100644
--- a/samples/helloworld.ks
+++ b/samples/helloworld.ks
@@ -2,8 +2,4 @@
 //mod D:\code\rs\key-native\target\debug\key_native.dll> m
 //mod D:\code\rs\key-lang\samples\testmod.ks> m;
 
-log('{//start
-  8A03D5af 90
-  / ok
-  3223 423 2
-}')
\ No newline at end of file
+log(2.76543.to_fixed(3))
\ No newline at end of file
diff --git a/src/primitive/float.rs b/src/primitive/float.rs
new file mode 100644
index 0000000..40fded6
--- /dev/null
+++ b/src/primitive/float.rs
@@ -0,0 +1,133 @@
+use crate::{
+  intern::{Interned,intern}, 
+  runtime::calc::CalcRef,
+  native::NativeFn
+};
+use super::litr::Litr;
+
+fn to_f(v:&Litr)-> f64 {
+  match v {
+    Litr::Uint(n)=> *n as _,
+    Litr::Int(n)=> *n as _,
+    Litr::Float(n)=> *n,
+    _=> 0.0
+  }
+}
+pub fn method(n:f64, name:Interned, args:Vec<CalcRef>)-> Litr {
+  macro_rules! get_arg0 {($deal:ident)=> {
+    args.get(0).map_or(0.0, |n|$deal(n))
+  }}
+  match name.vec() {
+    // exponential 指数
+    b"log"=> Litr::Float(n.log(get_arg0!(to_f))),
+    b"log2"=> Litr::Float(n.log2()),
+    b"log10"=> Litr::Float(n.log10()),
+    b"ln"=> Litr::Float(n.ln()),
+    b"log1p"=> Litr::Float(n.ln_1p()),
+    b"exp"=> Litr::Float(n.exp()),
+    b"exp2"=> Litr::Float(n.exp2()),
+    b"expm1"=> Litr::Float(n.exp_m1()),
+    b"hypot"=> Litr::Float(n.hypot(get_arg0!(to_f))),
+
+    // triangles 三角函数
+    b"acos"=> Litr::Float(n.acos()),
+    b"acosh"=> Litr::Float(n.acosh()),
+    b"asin"=> Litr::Float(n.asin()),
+    b"asinh"=> Litr::Float(n.asinh()),
+    b"atan"=> Litr::Float(n.atan()),
+    b"atan2"=> Litr::Float(n.atan2(get_arg0!(to_f))),
+    b"atanh"=> Litr::Float(n.atanh()),
+    b"cos"=> Litr::Float(n.cos()),
+    b"cosh"=> Litr::Float(n.cosh()),
+    b"sin"=> Litr::Float(n.sin()),
+    b"sinh"=> Litr::Float(n.sinh()),
+    b"tan"=> Litr::Float(n.tan()),
+    b"tanh"=> Litr::Float(n.tanh()),
+    b"sincos"=> Litr::List(vec![Litr::Float(n.sin()), Litr::Float(n.cos())]),
+
+    // rounding 四舍五入
+    b"ceil"=> Litr::Int(n.ceil() as _),
+    b"floor"=> Litr::Float(n.floor()),
+    b"round"=> Litr::Float(n.round()),
+    b"trunc"=> Litr::Int(n.trunc() as _),
+    b"fract"=> Litr::Float(n.fract()),
+
+    // power 次幂
+    b"pow"=> Litr::Float(
+      args.get(0).map_or(0.0, |val|match &**val {
+        Litr::Uint(r)=> n.powi(*r as _),
+        Litr::Int(r)=> n.powi(*r as _),
+        Litr::Float(r)=> n.powf(*r),
+        _=> 1.0
+      })),
+    b"sqrt"=> Litr::Float(n.sqrt()),
+    b"cbrt"=> Litr::Float(n.cbrt()),
+    b"recip"=> Litr::Float(n.recip()),
+
+    // compare 比较
+    b"max"=> Litr::Float(n.max(get_arg0!(to_f))),
+    b"min"=> Litr::Float(n.min(get_arg0!(to_f))),
+    b"clamp"=> Litr::Float({
+      assert!(args.len()>=2, "float.clamp需要2个Float作为参数");
+      let [mut min,mut max] = [to_f(args.get(0).unwrap()), to_f(args.get(1).unwrap())];
+      if min > max {
+        std::mem::swap(&mut min, &mut max);
+      }
+      n.clamp(min,max)
+    }),
+
+    // sign 符号 注意0和-0的符号不一样
+    b"abs"=> Litr::Float(n.abs()),
+    b"copy_sign"=> Litr::Float(n.copysign(get_arg0!(to_f))),
+    b"is_pos"=> Litr::Bool(n.is_sign_positive()),
+
+    // Pi 圆周
+    b"deg"=> Litr::Float(n.to_degrees()),
+    b"rad"=> Litr::Float(n.to_radians()),
+
+    // memory 内存
+    b"as_buf"=> Litr::Buf(n.to_ne_bytes().to_vec()),
+    b"rev"=> Litr::Float({
+      let mut b = n.to_ne_bytes();
+      b.reverse();
+      // SAFETY: 这十分unsafe, 不过在考虑字节序时这会很便利
+      unsafe{std::mem::transmute(b)}
+    }),
+    b"is_nan"=> Litr::Bool(n.is_nan()),
+    b"is_infinite"=> Litr::Bool(n.is_infinite()),
+
+    // string 字符
+    b"to_str"=> Litr::Str(n.to_string()),
+    b"to_fixed"=> Litr::Str({
+      match args.get(0) {
+        Some(fix_to)=> {
+          let mut s = n.to_string();
+
+          let fix_to = 2 + match &**fix_to {
+            Litr::Int(n)=> *n as _,
+            Litr::Uint(n)=> *n as _,
+            _=> 0
+          };
+          let trunc_len = n.trunc().to_string().len();
+          let len = trunc_len - 1 + fix_to;
+
+          if len>=s.len() {
+            s.push_str(&"0".repeat(len - s.len()));
+          }else {
+            s.truncate(len);
+          }
+          s
+        }
+        None=> n.to_string()
+      }
+    }),
+
+    _=> panic!("{}上没有{}方法","Float",name)
+  }
+}
+
+// - statics -
+pub fn statics()-> Vec<(Interned, NativeFn)> {
+  vec![
+  ]
+}
\ No newline at end of file
diff --git a/src/primitive/int.rs b/src/primitive/int.rs
index 1d43449..b70f721 100644
--- a/src/primitive/int.rs
+++ b/src/primitive/int.rs
@@ -45,7 +45,7 @@ pub fn method_int(n:isize, name:Interned, args:Vec<CalcRef>)-> Litr {
     b"to_hex"=> Litr::Str(format!("{:X}", n)),
     b"min"=> Litr::Int(n.min(get_arg0!(to_isize))),
     b"max"=> Litr::Int(n.max(get_arg0!(to_isize))),
-    _=> panic!("{}上没有{}方法","int",name)
+    _=> panic!("{}上没有{}方法","Int",name)
   }
 }
 
@@ -71,7 +71,7 @@ pub fn method_uint(n:usize, name:Interned, args:Vec<CalcRef>)-> Litr {
     b"to_hex"=> Litr::Str(format!("{:X}", n)),
     b"min"=> Litr::Uint(n.min(get_arg0!(to_usize))),
     b"max"=> Litr::Uint(n.max(get_arg0!(to_usize))),
-    _=> panic!("{}上没有{}方法","int",name)
+    _=> panic!("{}上没有{}方法","Uint",name)
   }
 }
 
@@ -96,3 +96,25 @@ fn s_parse_int(args:Vec<CalcRef>, _cx:Scope)-> Litr {
   }
   Litr::Int(0)
 }
+
+// - statics uint -
+pub fn statics_uint()-> Vec<(Interned, NativeFn)> {
+  vec![
+    (intern(b"parse"), s_parse_uint),
+    (intern(b"max"), |_,_|Litr::Uint(usize::MAX)),
+    (intern(b"min"), |_,_|Litr::Uint(usize::MIN))
+  ]
+}
+
+/// 根据传入的进制解析字符串
+fn s_parse_uint(args:Vec<CalcRef>, _cx:Scope)-> Litr {
+  let radix = args.get(1).map_or(10, |n|to_u32(&**n));
+  if let Some(s) = args.get(0) {
+    return match &**s {
+      Litr::Str(s)=> Litr::Uint(usize::from_str_radix(s, radix)
+        .unwrap_or_else(|_|panic!("Uint::parse: 数字'{}'解析失败",s))),
+      n=> Litr::Uint(to_usize(n))
+    }
+  }
+  Litr::Uint(0)
+}
diff --git a/src/primitive/mod.rs b/src/primitive/mod.rs
index 7d2b2fb..d2005a2 100644
--- a/src/primitive/mod.rs
+++ b/src/primitive/mod.rs
@@ -9,6 +9,7 @@ pub mod kstd;
 pub mod buf;
 pub mod list;
 pub mod int;
+pub mod float;
 pub mod sym;
 pub mod obj;
 pub mod iter;
@@ -68,13 +69,15 @@ pub fn classes()-> Vec<(Interned, Class)> {unsafe {
   if let Some(cls) = &mut CLASSES {
     cls.iter_mut().map(|(name, f)|(*name, Class::Native(f))).collect()
   }else {
-    let buf_c = new_static_class(b"Buf", buf::statics());
-    let list_c = new_static_class(b"List", list::statics());
-    let obj_c = new_static_class(b"Obj", obj::statics());
-    let int_c = new_static_class(b"Int", int::statics_int());
-    let sym_c = new_static_class(b"Sym", sym::statics());
-    let func_c = new_static_class(b"Func", func::statics());
-    CLASSES = Some(vec![buf_c, list_c, obj_c, int_c, sym_c, func_c]);
+    CLASSES = Some(vec![
+      new_static_class(b"Buf", buf::statics()),
+      new_static_class(b"List", list::statics()),
+      new_static_class(b"Obj", obj::statics()),
+      new_static_class(b"Int", int::statics_int()),
+      new_static_class(b"Uint", int::statics_uint()),
+      new_static_class(b"Sym", sym::statics()),
+      new_static_class(b"Func", func::statics()),
+    ]);
     classes()
   }
 }}
diff --git a/src/runtime/calc.rs b/src/runtime/calc.rs
index 942711c..3c3bc5d 100644
--- a/src/runtime/calc.rs
+++ b/src/runtime/calc.rs
@@ -490,15 +490,6 @@ fn binary(mut this: Scope, left:&Box<Expr>, right:&Box<Expr>, op:&Box<[u8]>)-> L
         _=> panic!($pan)
       }
     }};
-    ($pan:literal $op:tt $n:tt)=> {{
-      if match &*right {
-        Int(r) => *r == 0,
-        Uint(r) => *r == 0,
-        Float(r) => *r == 0.0,
-        _=> false
-      } {panic!("除数必须非0")}
-      impl_num!($pan $op)
-    }};
   }
 
   /// 二元运算中无符号数的戏份
@@ -571,8 +562,9 @@ fn binary(mut this: Scope, left:&Box<Expr>, right:&Box<Expr>, op:&Box<[u8]>)-> L
     },
     b"-" => impl_num!("相减类型不同" -),
     b"*" => impl_num!("相乘类型不同" *),
-    b"%" => impl_num!("求余类型不同" % 0),
-    b"/" => impl_num!("相除类型不同" / 0),
+    // 本应该判断非0的,还是让rust帮我报错吧
+    b"%" => impl_num!("求余类型不同" %),
+    b"/" => impl_num!("相除类型不同" /),
 
     // unsigned
     b"<<" => impl_unsigned!("左移需要左值无符号" <<),
diff --git a/src/runtime/call.rs b/src/runtime/call.rs
index 8856459..a5f1ac8 100644
--- a/src/runtime/call.rs
+++ b/src/runtime/call.rs
@@ -46,6 +46,7 @@ impl Scope {
       Litr::List(v)=> primitive::list::method(v, self, name, args),
       Litr::Obj(o)=> primitive::obj::method(o, self, name, args),
       Litr::Int(n)=> primitive::int::method_int(*n, name, args),
+      Litr::Float(n)=> primitive::float::method(*n, name, args),
       Litr::Inst(inst)=> {
         let cannot_access_private = unsafe {(*inst.cls).module} != self.exports;
         let cls = unsafe {&*inst.cls};