JavaScript Assignment

"use strict";

function task1(){
/* Variable Declaration and Data Types (2 marks)

    Declare and initialize variables for the following data types:
            String
            Number (integer and float)
            Boolean
            Array */

    let string1 = "Hello World !"; //String
    let number1 = 13; //integer
    let number2 = 8.5; //float
    let boolean = true //boolean
    let array = ("option 1", "option 2", "option 3"); //array
}


function calculateArea(){ //task 2
/*Functions (3 marks)

    Create a function called calculateArea that takes the radius of a circle as a parameter and returns the area of the circle. Use 
the formula: area = π * r^2 (where π is approximately 3.14159).

    Create another function called reverseString that takes a string as a parameter and returns the reversed string.
*/
    const pi = 3.14159;
    const radiusInput = document.getElementById('radius');
    const radius = parseFloat(radiusInput.value);
    
    if (!isNaN(radius) && radius > 0){
        const circle_area = pi * Math.pow(radius,2);
        console.log("The area of the circle is: " + circle_area);
    }
    else{
        console.log("Please enter a valid number!")
    }
}

function reverseString(){

    //Create another function called reverseString that takes a string as a parameter and returns the reversed string.

    const stringInput = document.getElementById('string');
    const string = stringInput.value;
    const reversed_string = string.split("").reverse().join("");
    console.log("Reversed String: " + reversed_string)

    
}


function gradeCalculator(){ //task 3
/*    Write a function called gradeCalculator that takes a numerical score as a parameter and returns a letter grade based on the 
following scale:
                90-100: A
                80-89: B
                70-79: C
                60-69: D
                0-59: F 
                */

    const scoreInput = document.getElementById('score');
    const score = parseFloat(scoreInput.value);
    
    if (score >= 90 && score <= 100){
        console.log(`${score} is A`);
    }
    else if (score >= 80 && score <= 89){
        console.log(`${score} is B`);
    }
    else if (score >= 70 && score <= 79){
        console.log(`${score} is C`);
    }
    else if (score >= 60 && score <= 69){
        console.log (`${score} is D`);
    }
    else if (score >= 0 && score <= 59){
        console.log (`${score} is F`);
    }
    else{
        console.log (`Your grade should be a positive number`);
    }
}