diff --git a/compiler/fn.v b/compiler/fn.v
index 4cab57a949..6f47078308 100644
--- a/compiler/fn.v
+++ b/compiler/fn.v
@@ -414,7 +414,7 @@ fn (p mut Parser) fn_decl() {
 		p.genln('init_consts();')
 		if 'os' in p.table.imports {
 			if f.name == 'main' {
-				p.genln('os__args = os__init_os_args(argc, argv);')
+				p.genln('os__args = os__init_os_args(argc, (byteptr*)argv);')
 			}
 			else if f.name == 'WinMain' {
 				p.genln('os__args = os__parse_windows_cmd_line(pCmdLine);')
diff --git a/compiler/main.v b/compiler/main.v
index 905a8d2fe7..ce8bd0d7d6 100644
--- a/compiler/main.v
+++ b/compiler/main.v
@@ -960,9 +960,9 @@ fn (v &V) test_v() {
 	//	println('$joined_args')
 	mut failed := false
 	test_files := os.walk_ext('.', '_test.v')
-  
+
 	println('Testing...')
-	mut tmark := benchmark.new_benchmark()  
+	mut tmark := benchmark.new_benchmark()
 	for dot_relative_file in test_files {		
 		relative_file := dot_relative_file.replace('./', '')
 		file := os.realpath( relative_file )
@@ -1045,6 +1045,6 @@ pub fn cerror(s string) {
 fn vhash() string {
 	mut buf := [50]byte
 	buf[0] = 0
-	C.snprintf(buf, 50, '%s', C.V_COMMIT_HASH )
+	C.snprintf(*char(buf), 50, '%s', C.V_COMMIT_HASH )
 	return tos_clone(buf)
 }
diff --git a/vlib/math/math.v b/vlib/math/math.v
index 0f9707cb67..e1337a1205 100644
--- a/vlib/math/math.v
+++ b/vlib/math/math.v
@@ -29,18 +29,18 @@ const (
 )
 
 const (
-        MaxI8   = (1<<7) - 1
-        MinI8   = -1 << 7
-        MaxI16  = (1<<15) - 1
-        MinI16  = -1 << 15
-        MaxI32  = (1<<31) - 1
-        MinI32  = -1 << 31
+        MaxI8   = 127
+        MinI8   = -128
+        MaxI16  = 32767
+        MinI16  = -32768
+        MaxI32  = 2147483647
+        MinI32  = -2147483648
 //        MaxI64  = ((1<<63) - 1)
 //        MinI64  = (-(1 << 63) )
-        MaxU8  = (1<<8) - 1
-        MaxU16 = (1<<16) - 1
-        MaxU32 = (1<<32) - 1
-        MaxU64 = (1<<64) - 1
+        MaxU8  = 255
+        MaxU16 = 65535
+        MaxU32 = 4294967295
+        MaxU64 = 18446744073709551615
 )
 
 // Returns the absolute value.
@@ -103,7 +103,7 @@ pub fn exp(a f64) f64 {
 
 // digits returns an array of the digits of n in the given base.
 pub fn digits(_n, base int) []int {
-	mut n := _n 
+	mut n := _n
 	mut sign := 1
 	if n < 0 {
 		sign = -1
@@ -133,8 +133,8 @@ pub fn exp2(a f64) f64 {
 }
 
 // factorial calculates the factorial of the provided value.
-// TODO bring back once multiple value functions are implemented 
-/* 
+// TODO bring back once multiple value functions are implemented
+/*
 fn recursive_product( n int, current_number_ptr &int) int{
     mut m := n / 2
     if (m == 0){
@@ -175,7 +175,7 @@ pub fn factorial(n int) i64 {
     }
     return i64((r << shift))
 }
-*/ 
+*/
 
 // floor returns the nearest integer lower or equal of the provided value.
 pub fn floor(a f64) f64 {
@@ -194,8 +194,8 @@ pub fn gamma(a f64) f64 {
 
 // gcd calculates greatest common (positive) divisor (or zero if a and b are both zero).
 pub fn gcd(a_, b_ i64) i64 {
-	mut a := a_ 
-	mut b := b_ 
+	mut a := a_
+	mut b := b_
 	if a < 0 {
 		a = -a
 	}