Practice - 021

A program to explain IF ELSE IF ladder

use text_io::scan;

/**
 * Reade three subject marks of a student and find the average of the marks.
 * Decide the student's grade by rules given below.
 * 70 <= Average      - Grade A
 * 60 <= Average < 70 - Grade B
 * 50 <= Average < 60 - Grade C
 * 40 <= Average < 50 - Grade D
 *       Average < 40 - Fail
 */

fn main() {
    practice21()
}

fn practice21() {
    let sub1: i32;
    let sub2: i32;
    let sub3: i32;

    println!("Enter 3 subject marks:");
    scan!("{} {} {}", sub1, sub2, sub3);

    let avg: f64 = (sub1 + sub2 + sub3) as f64 / 3.0;

    println!("Average = {}\n", avg);

    if avg >= 70.0 {
        println!("Grade A");
    } else if avg < 70.0 && avg >= 60.0 {
        println!("Grade B");
    } else if avg < 60.0 && avg >= 50.0 {
        println!("Grade C");
    } else if avg < 50.0 && avg >= 40.0 {
        println!("Grade D");
    } else {
        println!("Fail");
    }
}

Config

[package]
name = "practice"
version = "0.1.0"
edition = "2021"

[dependencies]
text_io = "0.1.12"

Result

Enter 3 subject marks:
45 65 80
Average = 63.333333333333336

Grade B