Control-Structures-JavaScript/index.html at main · gabrieldim/Control-Structures-JavaScript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        function palindrom_check(){
            number = prompt("Enter number: ")
            if(!isNaN(number)){
            last = number % 10;
            first = number / 100;

            if( last == parseInt(first) ){
                document.write("The entered number is palindrom")
            }else{
                document.write("Isn't palindrom")
            }
        }else{
            document.write("This is not number")
        }
    }

    function phone_number_check(){
        phoneNumber = prompt("Enter phone number: ")
        ph1 = phoneNumber.slice(0,3);
        ph2 = phoneNumber.slice(3,6);
        ph3 = phoneNumber.slice(6,9);
        if(ph1 == "070" || ph1 == "071" || ph1 == "072"){
            number = ph1+"/"+ph2+"-"+ph3+" - T-mobile";
        }
        if(ph1 == "075" || ph1 == "076"){
            number = ph1+"/"+ph2+"-"+ph3+" - One";
        }
        if(ph1 == "077" || ph1 == "078"){
            number = ph1+"/"+ph2+"-"+ph3+" - Vip";
        }
        document.write(number)
    }

    function longest_string(){
        longString = prompt("Enter a string: ")
        littleStrings = longString.split(" ");
        let longestIndex=0;
        let maxLength=-1;
       for(let i =0; i<littleStrings.length; i++){
            if(littleStrings[i].length > maxLength){
                maxLength = littleStrings[i].length;
                longestIndex = i;
            }
        }
        console.log(littleStrings[longestIndex])
    }

    function numbers_check(){
        for(let i=1; i<31 ;i++){
            if(i%2==0) document.write(i + " is odd number" + "<br>")
            if(i%2!=0) document.write(i + " is even number" + "<br>")
        }
    }

    function number_check(){
        nb1 = prompt("Enter the 1st number: ")
        nb2 = prompt("Enter the 2nd number: ")
        nb3 = prompt("Enter the 3rd number: ")

        let final = nb1*nb2*nb3;
        if(parseInt(final) < 0){
            document.write("-");
        }else{
            document.write("+")
        }
    }


    </script>
</head>
<body>
    <h4>Task 1: Check if the entered number (length 3) is a palindrom:</h4>
    <button onclick="palindrom_check()">Task 1</button>

    <br>

    <h4>Phone number check:</h4>
    <button onclick="phone_number_check()">Task 2</button>

    <br>

    <h4>Longest word in one string:</h4>
    <button onclick="longest_string()">Task 3</button>

    <br>

    <h4>Positive/Negative number check:</h4>
    <button onclick="number_check()">Task 4</button>

    <br>

    <h4>Print numbers:</h4>
    <button onclick="numbers_check()">Task 4</button>


</body>
</html>