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

Given the sides of a triangle (a, b, and c), and calculate the area of a triangle given three sides using Rust program.
Last Updated : September 29, 2021

Problem Statement

Here, we will read three sides of the triangle from the user. Then we will calculate the area of the triangle and print the result.

Formula to calculate the area of a triangle: The given sides are a, b, and c.

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.

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