Rust Program: Adding two numbers

Rust Basic: Exercise-2 with Solution

Write a Rust program that accepts two numbers from the user, adds them together, and displays the result.

Sample Solution:

Rust Code:

use std::io;

fn main() {
    println!("Enter the first number:");
    let mut input1 = String::new();
    io::stdin().read_line(&mut input1).expect("Failed to read input.");
    let num1: f64 = input1.trim().parse().expect("Please enter a valid number.");

    println!("Enter the second number:");
    let mut input2 = String::new();
    io::stdin().read_line(&mut input2).expect("Failed to read input.");
    let num2: f64 = input2.trim().parse().expect("Please enter a valid number.");

    let sum = num1 + num2;
    println!("The sum of {} and {} is: {}", num1, num2, sum);
}

Output:

The sum of 10 and 22 is: 32

Explanation:

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

• Import the "io" module from the standard library to handle user input.
• Inside the "main()" function, we prompt the user to enter the first number.
• Create a mutable String variable 'input1' to store the user's input. We use io::stdin().read_line(&mut input1) to read the input from the user.
• Parse 'input1' into a floating-point number (f64) using the "trim()" method to remove leading and trailing whitespace, and "parse()" to convert the string to a number. We use "expect()" to handle errors during parsing.
• Repeat the same process for the second number.
• Calculate the sum of 'num1' and 'num2' and store it in the variable 'sum'.
• Finally, we print the sum using println!().

Rust Code Editor:

Previous: Rust System information gathering program.
Next: Rust Program: Variable counter operations.