Rust program to calculate the area of a triangle given three sides

Program/Source Code:

The source code to calculate the area of a triangle given three sides is given below. The given program is compiled and executed successfully.

// Rust program to calculate the 
// area of a triangle given three sides

use std::io;

fn main() 
{
    let mut a:f32 = 0.0;
    let mut b:f32 = 0.0;
    let mut c:f32 = 0.0;
    let mut s:f32 = 0.0;
    let mut area:f32 = 0.0;
    
    let mut input1 = String::new();
    let mut input2 = String::new();
    let mut input3 = String::new();
    
    println!("Enter first edge of triangle: ");
    io::stdin().read_line(&mut input1).expect("Not a valid string");
    a = input1.trim().parse().expect("Not a valid number");

    println!("Enter second edge of triangle: ");
    io::stdin().read_line(&mut input2).expect("Not a valid string");
    b = input2.trim().parse().expect("Not a valid number");
    
    println!("Enter third edge of triangle: ");
    io::stdin().read_line(&mut input3).expect("Not a valid string");
    c = input3.trim().parse().expect("Not a valid number");
    
    s = (a + b + c) / 2.0;
    area = s * (s - a) * (s - b) * (s - c);
    area = area.sqrt();
    
    println!("Area of a triangle: {}", area);
}

Output:

Enter first edge of triangle: 
2
Enter second edge of triangle: 
3
Enter third edge of triangle: 
4
Area of a triangle: 2.9047375

Explanation:

Here, we read the three sides of the triangle from the user. Then we calculated the area of the triangle and printed the result.