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Rust - Data Structure - Struct - Print
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/* | |
Specify that structure implements the Debug trait | |
i.e. we will be able to print structure contents by using {:?} specifier in our print statements | |
*/ | |
//#[derive(Debug)] | |
struct Person | |
{ | |
name: String | |
, age: u8 | |
} | |
fn main() | |
{ | |
// Create struct with field init shorthand | |
//String Literals ( static ) | |
let nameHardCoded = "Peter 1"; | |
let age1 = 27; | |
let objPeter1 = Person | |
{ | |
name:nameHardCoded.to_string() | |
, age:age1 | |
}; | |
//Debug Basic Print Person 1 | |
println! | |
( | |
"{0:?}" | |
, objPeter1 | |
); | |
println!(""); | |
println!(""); | |
//Debug Pretty Print Person 1 | |
println! | |
( | |
"{0:#?}" | |
, objPeter1 | |
); | |
println!(""); | |
println!(""); | |
/* | |
//Print Person 1 along with other data | |
println! | |
( | |
"variable contents \r\n \r\n {0:#?} \r\n \r\n variable name {1} \r\n \r\n age {2}" | |
, objPeter1 | |
, "objPeter1" | |
, 30 | |
); | |
*/ | |
} |
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/* | |
Specify that structure implements the Debug trait | |
i.e. we will be able to print structure contents by using {:?} specifier in our print statements | |
*/ | |
#[derive(Debug)] | |
struct Person | |
{ | |
name: String | |
, age: u8 | |
} | |
fn main() | |
{ | |
// Create struct with field init shorthand | |
//String Literals ( static ) | |
let nameHardCoded = "Peter 1"; | |
let age1 = 27; | |
let objPeter1 = Person | |
{ | |
name:nameHardCoded.to_string() | |
, age:age1 | |
}; | |
//Debug Basic Print Person 1 | |
println! | |
( | |
"{0:?}" | |
, objPeter1 | |
); | |
println!(""); | |
println!(""); | |
//Debug Pretty Print Person 1 | |
println! | |
( | |
"{0:#?}" | |
, objPeter1 | |
); | |
println!(""); | |
println!(""); | |
/* | |
//Print Person 1 along with other data | |
println! | |
( | |
"variable contents \r\n \r\n {0:#?} \r\n \r\n variable name {1} \r\n \r\n age {2}" | |
, objPeter1 | |
, "objPeter1" | |
, 30 | |
); | |
*/ | |
} | |
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use std::fmt::{self, Formatter, Display}; | |
/* | |
Specify that structure implements the Debug trait | |
i.e. we will be able to print structure contents by using {:?} specifier in our print statements | |
*/ | |
//#[derive(Debug)] | |
struct Person | |
{ | |
name: String | |
, age: u8 | |
} | |
/* | |
Rust - How to print structs and arrays? | |
https://stackoverflow.com/questions/30253422/how-to-print-structs-and-arrays | |
All types can derive (automatically create) the fmt::Debug implementation as #[derive(Debug)], | |
but fmt::Display must be manually implemented. | |
You can create a custom output: | |
*/ | |
impl std::fmt::Display for Person | |
{ | |
fn fmt | |
( | |
&self, f: &mut std::fmt::Formatter | |
) -> std::fmt::Result | |
{ | |
write! | |
( | |
f | |
, "Person ( name: \"{0}\", age: {1} )" | |
, self.name | |
, self.age | |
) | |
} | |
} | |
fn main() | |
{ | |
// Create struct with field init shorthand | |
//String Literals ( static ) | |
let nameHardCoded:&'static str = "Peter 1"; | |
let age = 27; | |
let objPeter = Person | |
{ | |
name:nameHardCoded.to_string() | |
, age:age | |
}; | |
//Debug Basic Print Person 1 | |
println! | |
( | |
"{0}" | |
, objPeter | |
); | |
//String Literals ( static ) | |
let nameJohn = "John 2"; | |
let objJohn = nameJohn.to_string(); | |
let ageJohn = 29; | |
let objJohn = Person | |
{ | |
name:objJohn | |
, age:ageJohn | |
}; | |
//Debug Basic Print Person 1 | |
println! | |
( | |
"{0}" | |
, objJohn | |
); | |
} |
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