Rustでprintlnとdbgの確認

Hello　world をやってみて、いろいろ確認

参考

リテラルのみ

• 文字列
  • "Hello"
  • r##"#06-6012-3456"##
• 整数
  • 2
  • 0xff
  • 0b101
• 小数
  • 3.14
  • 1.2e-4
• 文字
  • 🦊
• 論理
  • true
• バイト
  • b'k'
  • b"bytes"

ソース

fn main() {
    let s1 = "Hello";
    let s2 = r##"#06-6012-3456"##;
    let i3 = 2;
    let i4 = 0xff;
    let i5 = 0b101;
    let f6 = 3.14;
    let f7 = 1.2e-4;
    let c8 = '🦊';
    let b9 = true;
    let ba = b'k';
    let bb = b"bytes";
    let df_a = dbg!(format!("{} {} {} {} {} {} {} {} {} {} {:?}", s1, s2, i3, i4, i5, f6, f7, c8, b9, ba, bb));
    println!("{}", df_a);
    
    let t_12 = dbg!(s1, s2);
    let t_23 = dbg!(s2, i3);
    let t_34 = dbg!(i3, i4);
    let t_45 = dbg!(i4, i5);
    let t_56 = dbg!(i5, f6);
    let t_67 = dbg!(f6, f7);
    let t_78 = dbg!(f7, c8);
    let t_89 = dbg!(c8, b9);
    let t_9a = dbg!(b9, ba);
    let t_ab = dbg!(ba, bb);
    let t_b1 = dbg!(bb, s1);
    let df_b = dbg!(format!("{} {} {} {} {} {} {} {} {} {} {:?}", t_12.0, t_23.0, t_34.0, t_45.0, t_56.0, t_67.0, t_78.0, t_89.0, t_9a.0, t_ab.0, t_b1.0));
    println!("{}", df_b);
}

出力

Hello #06-6012-3456 2 255 5 3.14 0.00012 🦊 true 107 [98, 121, 116, 101, 115]
Hello #06-6012-3456 2 255 5 3.14 0.00012 🦊 true 107 [98, 121, 116, 101, 115]

String

ソース

fn main() {
    let l1 = "Hello";
    let l2 = "World";
    let l3 = "test";
    let l13 = dbg!(l1, l3);
    let l23 = dbg!(l2, l3);
    let l4 = dbg!(format!("{} {}", l13.0, l23.0));
    println!("{}", l4);
    
    let s1 = String::from(l1);
    let s2 = String::from(l2);
    //let s3 = String::from(l3);
    let s13 = dbg!(s1);
    let s23 = dbg!(s2);
    let s4 = dbg!(format!("{} {}", s13, s23));
    println!("{}", s4);
    
    let ss1 = String::from(l1);
    let ss2 = String::from(l2);
    let ss3 = String::from(l3);
    let ss13 = dbg!(ss1, &ss3);
    let ss23 = dbg!(ss2, &ss3);
    let ss4 = dbg!(format!("{} {}", ss13.0, ss23.0));
    println!("{}", ss4);
    
    let sss1 = String::from(l1);
    let sss2 = String::from(l2);
    let sss3 = String::from(l3);
    let sss123 = dbg!(&sss1, &sss2, &sss3);
    let sss213 = dbg!(&sss2, &sss1, &sss3);
    let sss4 = dbg!(format!("{} {}", sss123.0, sss213.0));
    println!("{}", sss4);
}

出力

Hello World
Hello World
Hello World
Hello World