Control Flow

Make decisions with if, match, loop, while, and for.

Learning objectives

• Use if expressions for branching
• Use match for clear multi-branch decisions
• Repeat tasks with loop, while, and for

If Expressions

Rust uses if expressions to run different blocks of code based on conditions. Conditions must evaluate to a boolean value.

Match Expressions

The match expression is one of Rust’s most useful control flow tools. It allows you to compare a value against multiple patterns in a clear and safe way.

Loops

Rust provides loop, while, and for. For most beginner programs, for loops are very useful when working with ranges or collections.

Example code

fn main() {
    let mark = 82;

    if mark >= 50 {
        println!("Pass");
    } else {
        println!("Fail");
    }

    let grade = match mark {
        90..=100 => "A",
        80..=89 => "B",
        70..=79 => "C",
        50..=69 => "D",
        _ => "F",
    };

    println!("Grade: {}", grade);

    for number in 1..=5 {
        println!("Number: {}", number);
    }
}