Control Flow in Rust
Control Flow
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In Rust, control flow refers to the order in which statements and expressions are executed within a program. Control flow is managed using different programming constructs such as conditional statements, loops, and match expressions, among others.
Conditional statements in Rust allow a program to make decisions based on certain conditions. The if-else statement is the most commonly used conditional statement in Rust.
For example:
let number = 10; if number > 5 { println!("Number is greater than 5"); } else { println!("Number is less than or equal to 5"); }
Loops in Rust are used to repeatedly execute a block of code until a certain condition is met. There are three types of loops in Rust: loop
, while
, and for
. The loop
statement creates an infinite loop until it is explicitly broken. The while
statement repeatedly executes a block of code while a certain condition is true. The for
statement is used to iterate over a collection of items.
For example:
let mut x = 0; while x < 5 { println!("The value of x is: {}", x); x += 1; } for number in 0..5 { println!("The value of number is: {}", number); }
Match expressions in Rust are used to compare a value against a set of patterns and execute the corresponding branch if there is a match. Match expressions can be used to replace long chains of if-else statements.
For example:
let x = 3; match x { 1 => println!("One"), 2 => println!("Two"), 3 => println!("Three"), _ => println!("Other"), // default case }
In summary, control flow is an important concept in Rust programming and is used to manage the flow of code execution within a program. Rust provides various control flow constructs such as conditional statements, loops, and match expressions to facilitate this.
March 27, 2023