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78 lines
2.4 KiB
Rust
78 lines
2.4 KiB
Rust
fn main() {
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let width = 4;
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let precision = 2;
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let value = 10;
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println!("Value {value:#width$.precision$}", value = 10.5);
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println!("Value {0:#1$.2$}", value, width, precision);
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println!("Value {} {}", value, width);
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// Examples from https://doc.rust-lang.org/std/fmt
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println!("Hello");
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println!("Hello, {}!", "world");
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println!("The number is {}", 1);
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println!("{:?}", (3, 4));
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println!("{value}", value = 4);
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let people = "Rustaceans";
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println!("Hello {people}!");
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println!("{} {}", 1, 2);
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println!("{:04}", 42);
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println!("{:#?}", (100, 200));
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println!("{1} {} {0} {}", 1, 2);
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println!("Hello {:5}!", "x");
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println!("Hello {:1$}!", "x", 5);
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println!("Hello {1:0$}!", 5, "x");
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println!("Hello {:width$}!", "x", width = 5);
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let width = 5;
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println!("Hello {:width$}!", "x");
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assert_eq!(format!("Hello {:<5}!", "x"), "Hello x !");
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assert_eq!(format!("Hello {:-<5}!", "x"), "Hello x----!");
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assert_eq!(format!("Hello {:^5}!", "x"), "Hello x !");
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assert_eq!(format!("Hello {:>5}!", "x"), "Hello x!");
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println!("Hello {:^15}!", format!("{:?}", Some("hi")));
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assert_eq!(format!("Hello {:+}!", 5), "Hello +5!");
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assert_eq!(format!("{:#x}!", 27), "0x1b!");
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assert_eq!(format!("Hello {:05}!", 5), "Hello 00005!");
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assert_eq!(format!("Hello {:05}!", -5), "Hello -0005!");
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assert_eq!(format!("{:#010x}!", 27), "0x0000001b!");
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println!("Hello {0} is {1:.5}", "x", 0.01);
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println!("Hello {1} is {2:.0$}", 5, "x", 0.01);
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println!("Hello {0} is {2:.1$}", "x", 5, 0.01);
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println!("Hello {} is {:.*}", "x", 5, 0.01);
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println!("Hello {1} is {2:.*}", 5, "x", 0.01);
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println!("Hello {} is {2:.*}", "x", 5, 0.01);
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println!("Hello {} is {number:.prec$}", "x", prec = 5, number = 0.01);
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println!(
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"{}, `{name:.*}` has 3 fractional digits",
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"Hello",
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3,
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name = 1234.56
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);
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println!(
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"{}, `{name:.*}` has 3 characters",
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"Hello",
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3,
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name = "1234.56"
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);
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println!(
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"{}, `{name:>8.*}` has 3 right-aligned characters",
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"Hello",
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3,
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name = "1234.56"
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);
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print!("{0:.1$e}", 12345, 3);
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print!("{0:.1$e}", 12355, 3);
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println!("The value is {}", 1.5);
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assert_eq!(format!("Hello {{}}"), "Hello {}");
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assert_eq!(format!("{{ Hello"), "{ Hello");
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}
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