The println! macro in Rust is powerful, the following are some common use cases.

1. Placeholder {} for any data type.

   println!("First: {}, Second: {}, Third: {}.", "a", 1, true);

   The output:

   First: a, Second: 1, Third: true.

2. Traits for numbers

   println!("Binary: {:b} Hex: {:x} Octal: {:o}", 10, 10, 10);

   The output:

   Binary: 1010 Hex: a Octal: 12

3. A “tuple” of values

   println!("{:?}", (10, true, "text"));

   The output:

   (10, true, "text")