Types

MLang is statically typed. Every variable has a known type at declaration time.

Primitive types

int

64-bit signed integer.

int x = 42;
int neg = -7;

Arithmetic: + - * / (integer division, truncates toward zero).

dec

64-bit IEEE 754 floating-point.

dec pi = 3.14159;
dec ratio = 1.0 / 3.0;

Mixed int/dec arithmetic promotes to dec:

dec result = 2 + 0.5;   # 2.5

txt

UTF-8 string.

txt greeting = "Hello, world!";

Concatenation with +:

txt full = "Hello, " + name;
txt mixed = "Score: " + 100;   # coerces int to txt

bool

true or false.

bool active = true;
bool done   = false;

Logical operators: && || !

Composite types

array<T>

Ordered, homogeneous, dynamically sized.

array<int> scores = [10, 20, 30];
array<txt> tags   = ["rust", "lang"];

Methods:

Method	Returns	Description
a.len()	int	Number of elements
a.push(v)	int	Appends value, returns new len
a.pop()	T	Removes and returns last element
a.clear()	int	Empties array, returns 0
a.contains(v)	bool	Membership test
a.slice(start, end)	array<T>	Sub-array (exclusive end)

Index access and assignment:

print(scores[0]);    # 10
scores[1] = 99;

struct

Named collection of typed fields. See Structs for full details.

struct Point { int x; int y }
Point p = Point { x = 3, y = 7 };
print(p.x);

Type conversions

Explicit casts using built-in functions:

int n   = int("42");      # parse txt → int
dec d   = dec(n);         # widen int → dec
int i   = int(3.9);       # truncate dec → int  (= 3)
txt s   = txt(100);       # format int → txt

read() always returns txt; use int() / dec() to parse user input:

int age = int(read("Age: "));