Rust Function: Find Sum of array elements

Rust Functions and Control Flow: Exercise-9 with Solution

Write a Rust function to find the sum of all elements in an array.

Sample Solution:

Rust Code:

// Define a function named 'sum_of_array' that takes an array of integers as input and returns the sum of all elements
fn sum_of_array(arr: &[i32]) -> i32 {
    // Initialize a variable 'sum' to store the sum of elements
    let mut sum = 0;

    // Iterate over each element of the array and add it to 'sum'
    for &num in arr {
        sum += num;
    }

    sum // Return the sum
}

fn main() {
    let array = [1, 2, 3, 4, 5]; // Define an array of integers

    // Call the 'sum_of_array' function with the array and store the result
    let result = sum_of_array(&array);

    // Print the sum of all elements in the array
    println!("Sum of all elements in the array: {}", result);
}

Output:

Sum of all elements in the array: 15

Explanation:

Here's a brief explanation of the above Rust code:

• fn sum_of_array(arr: &[i32]) -> i32 { ... }: This is a function named "sum_of_array()" that takes an array slice 'arr' of integers (&[i32]) as input and returns the sum of all elements as an integer (i32).
• Inside the function:
• We initialize a variable 'sum' to store the sum of elements.
• We iterate over each element 'num' of the array slice 'arr' using a "for" loop, adding each element to 'sum'.
• Finally, we return the value of 'sum'.
• In the main function,
• Define an array named 'array' containing some integers.
• Call the "sum_of_array()" function with a reference to the array ('&array') and store the result in a variable named 'result'.
• Finally we print the sum of all elements in the array.

Rust Code Editor:

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