# Rust program to calculate the HCF (Highest Common Factor)

Given two numbers, we have to find the Highest Common Factor (HCF) using Rust program.
Submitted by Nidhi, on September 28, 2021

Problem Solution:

Here, we will read two integer numbers from the user and find the Highest Common Factor of given numbers.

Program/Source Code:

The source code to calculate the HCF is given below. The given program is compiled and executed successfully.

```// Rust program to calculate the HCF.

use std::io;

fn main() {
let mut n1:u32 = 0;
let mut n2:u32 = 0;
let mut temp:u32 = 0;

let mut input1 = String::new();
let mut input2 = String::new();

println!("Enter number1: ");
n1 = input1.trim().parse().expect("Not a valid number");

println!("Enter number2: ");
n2 = input2.trim().parse().expect("Not a valid number");

while(n2 != 0)
{
temp = n1 % n2;
n1   = n2;
n2   = temp;
}

println!("Highest Common Factor is: {}",n1);
}
```

Output:

```RUN 1:
Enter number1:
5
Enter number2:
36
Highest Common Factor is: 1

RUN 2:
Enter number1:
30
Enter number2:
75
Highest Common Factor is: 15
```

Explanation:

Here, we read the value of n1, n2 from the user. Then we calculated the Highest Common Factor (HCF) of given numbers and printed the result.