For Loop in Rust

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In this tutorial, we will learn about for loops in Rust. We will cover the basics of iterative execution using for loops.

What is a For Loop

A for loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. The loop is typically used when the number of iterations is known before entering the loop.

Syntax

The syntax for the for loop in Rust is:

for item in iterable {
    // Code block to be executed
}

The for loop iterates over each item in the iterable object (such as an array, vector, or iterator) and executes the code block for each item.

Example 1: Printing Numbers from 1 to 10

Use a for loop to print numbers from 1 to 10.

Rust Program

fn main() {
    for i in 1..=10 {
        print!("{} ", i);
    }
}

Output

1 2 3 4 5 6 7 8 9 10

Example 2: Calculating the Factorial of a Number

Use a for loop to calculate the factorial of a number.

Rust Program

fn main() {
    let n = 5;
    let mut factorial = 1;
    for i in 1..=n {
        factorial *= i;
    }
    println!("Factorial of {} is {}", n, factorial);
}

Output

Factorial of 5 is 120

Example 3: Summing the Elements of an Array

Use a for loop to calculate the sum of the elements in an array.

Rust Program

fn main() {
    let arr = [1, 2, 3, 4, 5];
    let mut sum = 0;
    for &num in &arr {
        sum += num;
    }
    println!("Sum of the elements in the array is {}", sum);
}

Output

Sum of the elements in the array is 15

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