Rust Function: Analyzing integer slice

Rust Pattern Maching: Exercise-13 with Solution

Write a Rust function that takes a slice of integers and returns the sum of all elements if the sum is greater than 100, the product of all elements if the product is less than 100, and 0 otherwise.

Sample Solution:

Rust Code:

// Function that takes a slice of integers and returns a value based on the sum or product.
fn analyze_slice(slice: &[i32]) -> i32 {
    // Check if the slice is empty
    if slice.is_empty() {
        // If empty, return 0
        return 0;
    }

    // Calculate the sum of all elements
    let sum: i32 = slice.iter().sum();
    // Calculate the product of all elements
    let product: i32 = slice.iter().product();

    // If the sum is greater than 100, return the sum
    if sum > 100 {
        sum
    // If the product is less than 100, return the product
    } else if product < 100 {
        product
    // Otherwise, return 0
    } else {
        0
    }
}

fn main() {
    // Example usage
    let slice1 = &[10, 20, 30, 40, 50]; // Sum > 100
    let slice2 = &[1, 2, 3, 4]; // Product < 100
    let slice3 = &[10, 20, 30, 10]; // Sum < 100, Product > 100

    // Print the result for each slice
    println!("{}", analyze_slice(slice1)); // Output: 150
    println!("{}", analyze_slice(slice2)); // Output: 24
    println!("{}", analyze_slice(slice3)); // Output: 0
}

Output:

150
24
0

Explanation:

In the exercise above,

• The function "analyze_slice()" takes a slice of integers (&[i32]) as input and returns an integer (i32) as output.
• It first checks if the slice is empty. If it is, it returns 0.
• Next, it calculates the sum and product of all elements in the slice using the "iter()" method combined with "sum()" and "product()" functions.
• Based on the values of the sum and product, it determines the return value:
• If the sum is greater than 100, it returns the sum.
• If the product is less than 100, it returns the product.
• Otherwise, it returns 0.
• In the "main()" function, example slices are provided, and the result of calling "analyze_slice()" on each slice is printed.

Rust Code Editor:

Previous: Rust Function: Analyzing Boolean vector.
Next: Rust Triangle Classifier function.