Rust

3.5    Solutions

This section provides the code solutions for the practice exercises in Section 3.4.

1. Calculate the difference between square of sum and sum of squares

   fn main() {    let mut n = String::new();    std::io::stdin()        .read_line(&mut n)        .expect("failed to read input.");    let n: i32 = n.trim().parse().expect("invalid input");    let mut square_of_sum = 0;    let mut sum_of_squares = 0;    for i in 1..=n {        square_of_sum = square_of_sum + i;        sum_of_squares = sum_of_squares + i.pow(2);    }    let difference = square_of_sum.pow(2) - sum_of_squares;    println!(        "The difference of the square_of_sum and sum of Squares for N = {} is {}",        n, difference    );}  

2. Sum of multiples of 3 or 5 below a given number

   fn main() {    let mut n = String::new();    std::io::stdin