diff --git a/module/fib.cpp b/module/fib.cpp
index aeb4f5b..8c0c213 100644
--- a/module/fib.cpp
+++ b/module/fib.cpp
@@ -42,9 +42,10 @@ const auto ghost_for_test = "ghost_for_test";
 
 void ghost_for_test_destructor(void* ptr) {
     std::cout << "ghost_for_test::destructor (0x";
-    std::cout << std::hex << (u64)ptr << std::dec << ") {\n";
-    delete (u32*)ptr;
-    std::cout << "    delete 0x" << std::hex << (u64)ptr << std::dec << ";\n";
+    std::cout << std::hex << reinterpret_cast<u64>(ptr) << std::dec << ") {\n";
+    delete static_cast<u32*>(ptr);
+    std::cout << "    delete 0x" << std::hex;
+    std::cout << reinterpret_cast<u64>(ptr) << std::dec << ";\n";
     std::cout << "}\n";
 }
 
diff --git a/src/bits_lib.cpp b/src/bits_lib.cpp
index f06a7cf..398a563 100644
--- a/src/bits_lib.cpp
+++ b/src/bits_lib.cpp
@@ -3,23 +3,35 @@
 namespace nasal {
 
 var builtin_u32xor(var* local, gc& ngc) {
-    return var::num((f64)(u32(local[1].num())^u32(local[2].num())));
+    return var::num((f64)(
+        static_cast<u32>(local[1].num()) ^
+        static_cast<u32>(local[2].num())
+    ));
 }
 
 var builtin_u32and(var* local, gc& ngc) {
-    return var::num((f64)(u32(local[1].num())&u32(local[2].num())));
+    return var::num((f64)(
+        static_cast<u32>(local[1].num()) &
+        static_cast<u32>(local[2].num())
+    ));
 }
 
 var builtin_u32or(var* local, gc& ngc) {
-    return var::num((f64)(u32(local[1].num())|u32(local[2].num())));
+    return var::num((f64)(
+        static_cast<u32>(local[1].num()) |
+        static_cast<u32>(local[2].num())
+    ));
 }
 
 var builtin_u32nand(var* local, gc& ngc) {
-    return var::num((f64)(u32)(~(u32(local[1].num())&u32(local[2].num()))));
+    return var::num(static_cast<f64>(~(
+        static_cast<u32>(local[1].num()) &
+        static_cast<u32>(local[2].num())
+    )));
 }
 
 var builtin_u32not(var* local, gc& ngc) {
-    return var::num((f64)(u32)(~u32(local[1].num())));
+    return var::num(static_cast<f64>(~static_cast<u32>(local[1].num())));
 }
 
 var builtin_fld(var* local, gc& ngc) {
@@ -79,7 +91,7 @@ var builtin_sfld(var* local, gc& ngc) {
     if (res&(1<<(len-1))) {
         res |= ~((1<<len)-1);
     }
-    return var::num((f64)((i32)res));
+    return var::num(static_cast<f64>(static_cast<i32>(res)));
 }
 
 var builtin_setfld(var* local, gc& ngc) {
diff --git a/src/main.cpp b/src/main.cpp
index 6f6316e..b90fad2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -52,7 +52,7 @@ std::ostream& help(std::ostream& out) {
     << "   -t,   --time     | show execute time.\n"
     << "   -d,   --detail   | get detail info.\n"
     << "   -dbg, --debug    | debug mode.\n"
-    << "         --prof     | show profiling result, available under debug mode.\n"
+    << "         --prof     | show profiling result, available in debug mode.\n"
     << "         --prof-all | show profiling result of all files,"
     << "available under debug mode.\n"
     << "file:\n"
diff --git a/src/nasal_builtin.cpp b/src/nasal_builtin.cpp
index 9452585..8e70a01 100644
--- a/src/nasal_builtin.cpp
+++ b/src/nasal_builtin.cpp
@@ -51,7 +51,7 @@ var builtin_setsize(var* local, gc& ngc) {
     if (size.type!=vm_num || size.num()<0) {
         return nil;
     }
-    vec.vec().elems.resize((i64)size.num(), nil);
+    vec.vec().elems.resize(static_cast<i64>(size.num()), nil);
     return nil;
 }
 
@@ -144,7 +144,7 @@ var builtin_int(var* local, gc& ngc) {
     if (val.type!=vm_num && val.type!=vm_str) {
         return nil;
     }
-    return var::num(f64((i32)val.tonum()));
+    return var::num(static_cast<f64>(static_cast<i32>(val.tonum())));
 }
 
 var builtin_floor(var* local, gc& ngc) {
@@ -333,7 +333,7 @@ var builtin_right(var* local, gc& ngc) {
     if (len.type!=vm_num) {
         return nas_err("right", "\"length\" must be number");
     }
-    i32 length = (i32)len.num();
+    i32 length = static_cast<i32>(len.num());
     i32 srclen = str.str().length();
     if (length>srclen) {
         length = srclen;
diff --git a/src/nasal_gc.cpp b/src/nasal_gc.cpp
index 5f1a82b..d2b46ff 100644
--- a/src/nasal_gc.cpp
+++ b/src/nasal_gc.cpp
@@ -154,7 +154,8 @@ void nas_co::clear() {
 }
 
 std::ostream& operator<<(std::ostream& out, const nas_co& co) {
-    out << "<coroutine at 0x" << std::hex << u64(&co) << std::dec << ">";
+    out << "<coroutine at 0x" << std::hex;
+    out << reinterpret_cast<u64>(&co) << std::dec << ">";
     return out;
 }
 
diff --git a/src/nasal_vm.cpp b/src/nasal_vm.cpp
index 4ac5050..3952ec9 100644
--- a/src/nasal_vm.cpp
+++ b/src/nasal_vm.cpp
@@ -130,11 +130,11 @@ void vm::stackinfo(const u32 limit = 10) {
     var* bottom = ctx.stack;
     std::clog << "stack (0x" << std::hex << (u64)bottom << std::dec;
     std::clog << ", limit " << limit << ", total ";
-    std::clog << (top<bottom? 0:(i64)(top-bottom+1)) << ")\n";
+    std::clog << (top<bottom? 0:static_cast<i64>(top-bottom+1)) << ")\n";
     for(u32 i = 0; i<limit && top>=bottom; ++i, --top) {
         std::clog << "  0x" << std::hex
                   << std::setw(6) << std::setfill('0')
-                  << (u64)(top-bottom) << std::dec
+                  << static_cast<u64>(top-bottom) << std::dec
                   << "    ";
         valinfo(top[0]);
     }