javascript/loop.html at main · ReemHasanA/javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- <input id="x" type="number"> -->
    <button onclick="myFunction()">Try it</button>
    <button onclick="factorial()">factorial</button>
    <button onclick="Fibonacci()">Fibonacci</button>
    <p id="demo"></p>

    <script>
        // 1- Write a program that prints numbers from 1 to 10 using a for loop.

for (let a=1;a<=10;a++){
    console.log(a)
}

// 2-Write a program that prints the even numbers from 1 to 10 using a for loop.
// prefer start 1 use if !(a%2)
for(a=2;a<11;a+=2){
    console.log(a);
}

// 3- Write a program that prints the odd numbers from 1 to 10 using a while loop.
// for(a=1;a<10;a+=2){
//     console.log(a);
// }
a=1;
while(a<11){
  if(a%2){
    console.log(a);
  }
  ++a;
}

// 4- Write a program that prints the multiplication table of a number entered by the user using a for loop.
function myFunction() {
  let x = prompt("Please enter your number", "your number");
  if (x != NaN) {
    for (let a=1;a<=10;a++){
    console.log(a *x)
}
    // document.getElementById("demo").innerHTML =a*x;
  }
}

// 5- Write a program that calculates the sum of numbers from 1 to 100 using a while loop.
let b=0,i=0;
while (i++ < 100) {
  b += i;
  }
console.log(b)
// 6- Write a program that calculates the factorial of a number entered by the user using a for loop.
function factorial() {
  let y = prompt("Please enter your number", "your number");
  let f=1
    for (y;y>0;--y){
    f*=y
}
console.log(f)}
// 7- Write a program that prints the Fibonacci series up to a certain number entered by the user using a while loop.
function Fibonacci() {
  let z = prompt("Please enter your number", "your number");
  let b=1,d=0,c=a+b;
//     for (i=1;i<z;i+=2){
//     console.log(d)
//     console.log(b)
//     d+=b
//     b+=d
// }
//     while((b+=d)<z){
//     console.log(d)
//     // b+=d
//     console.log(b)
//     d+=b
// }
// do{

//   (b+=d)
//     console.log(d)
//     console.log(b)
//     d+=b

// }while((b+=d)<=z)
}

// 8- Write a program that prints the reverse of the following numbers:
//5 , 10 , 15 , 20
// using a while loop.


let num=[5 , 10 , 15 , 20]
i=num.length
while (--i>=0) {
    console.log(num[i])
}
    </script>
</body>
</html>