Println! What are the formats of macro

fn main() {
    Println! ("{}", 1); // default usage, print display
    Println! ("{: O}", 9); // octal
    Println! ("{: X}", 255); // hexadecimal lowercase
    Println! ("{: X}", 255); // hexadecimal uppercase
    Println! ("{: P}", & 0); // pointer
    Println! ("{: B}", 15); // binary
    Println! ("{: e}", 10000f32); // scientific count (lowercase)
    Println! ("{: e}", 10000f32); // scientific count (upper case)
    Println! ("{:?}", "test"); // print debug
    Println! ("{: #?}", ("test1", "test2")); // debug print with newline and indent
    Println! ("{a} {B} {B}", a = (x), B = (y)); // name the parameter
}

A comment for rust appears in the above code. Rust’s comments start with / / for line comments and start with / / for block comments/*and*/surround.

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