Web Reference: Rust has four primary scalar types: integers, floating-point numbers, Booleans, and characters. You may recognize these from other programming languages. Let’s jump into how they work in Rust. An integer is a number without a fractional component. We used one integer type in Chapter 2, the u32 type. Unlike many other programming languages, variables in Rust do not need to be declared with a specified type (like "String" for text or "Int" for numbers, if you are familiar with those from C or Java). Use the letkeyword to declare a variable. In the above example, data type of the variables will be inferred from the values assigned to them. For example, Rust will assign string data type to the variable company_string, float data type to rating_float, etc. The println!macro takes two arguments − 1. A special syntax { }, which is the placeholder 2...
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