Preface
Rust Data Type Conversion
There is no implicit data type conversion in Rust, only explicit data type conversion.
Numeric Literal Conversion to Data Types
- Append the data type after the numeric literal to convert the data type.
Default Values
- The compiler defaults to storing integers as
i32 and floating-point numbers as f64.
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| let num:i32 = 1;
let num:f64 = 1.0;
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Conversion between Numeric Type Variables
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| let num1:i32 = 1;
let num2:f64 = num1 as f64;
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Defining Data Type Aliases
- Type aliases must follow PascalCase naming convention.
Conversion to Type Aliases
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| let variable_name = 1 as AliasType;
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Implementing From for Custom Structures
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| struct StructName {
num:i32
}
impl From<i32> for StructName {
fn from(item:i32) -> Self {
StructName{num:item}
}
}
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Converting Data Types using from
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| let s:i32 = 1;
let res:StructName = StructName::from(s);
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Converting Data Types using into
- Converting data types using
into requires specifying the data type.
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| let s:i32 = 1;
let res:StructName = s.into();
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Conversion between Strings and Numeric Types
Converting Strings to Numeric Types
- As long as the target type implements
FromStr, you can use parse() to convert the string to the target type.
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| let res:i32 = "1".parse().unwrap();
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Completion
References
Bilibili - Learning for Salary Increase