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Ending's law: "Any application that can be compiled to WebAssembly, will be compiled to WebAssembly eventually."

3.3. Floating point number

Wa-lang currently supports the following types of floating point numbers (both are IEEE 754 standards):

  • f32: 32-bit floating point number
  • f64: 64-bit floating point number

Floating point numbers support the following unary operators

  • -: Get the negative arithmetic value (that is, subtract the operand from 0)

For example：

    i: f32 = 1.25
    println(-i) //-1.25

Floating point numbers support the following binary arithmetic operations:

  • +: Add, the two operand types must be consistent, the type of return value is same with operands;
  • -: Minus, the two operand types must be consistent, the type of return value is same with operands;
  • *: Mul, the two operand types must be consistent, the type of return value is same with operands;
  • /: Div, the two operand types must be consistent, the type of return value is same with operands;

For example：

    i, j: f64 = 1, 0.5
    println(i + j) // 1.5
    println(i - j) // 0.5
    println(i * j) // 0.5
    println(j / i) // 2

Floating point numbers support the following comparison operations:

  • ==: equal. The operands types must be consistent, and the return value is of bool type. If the judgment condition is met, true will be returned, otherwise false will be returned, the same below;
  • !=: not equal;
  • >: greater than;
  • >=: greater than;
  • <: less than;
  • <=: Small equal to.

When using untyped floating-point constants for variable short-declaration, the variable type is f64. The following two ways of writing are equivalent:

    f := 1.5

    f: f64 = 1.5