Program of Factorial, Fibonacci, Prime and Even/Odd using Angular

This angular tutorial help to create a script for Factorial, Fibonacci, Prime and Even/Odd. You can use these code for angular 13 as well.

There are some common programming interview questions asked by an interviewer to check logic. These questions are asked to beginners/freshers as well as mid-level programmers.

We will share angular 13 script code for following problems:

• Factorial using recursive manner
• n prime number in angular 13
• How to generate n number Fibonacci in angular 13
• Check number is even or odd in Angular 13

You can implement the same logic for JavaScript, Angular 1.4/9/12 and angular 13. There might be some syntax different for angular 1.4 and JavaScript. You can use the angular 13 switches conditional statement to execute a specific method, based on the parameter passed to the switch method.

Program of Factorial using Recursive Method in Angular 13

A factorial is a product of all the numbers from 1 to the user-specified number. We will pass n as the parameter that limits the number of factorials. If the passed parameter value is 0 then the factorial value would be 1. Below is the source code of the angular 13 program to print the factorial of a given number in the console.

4 number factorial is : 1X2X3X4 = 24

factorial(n) {
      if (n === 0) {
        return 1;
      }
      // This is it! Recursion!!
      return n * this.factorial(n - 1);
    }
    get_factorial(n) {
      console.log(this.factorial(n));
    }

Program of Fibonacci Number in Angular 13

The Fibonacci sequence is a series where the next term is the sum of the previous two terms. The first two terms of the Fibonacci sequence are 0 followed by 1.

The Fibonacci sequence of 4 : 0, 1, 1, 2, 3, 5

fibonacci_series(n) {
    var i : any;

    var a = 0, b = 1, f = 1;

    for(i = 2; i <= n; i++) {

        f = a + b;

        a = b;

        b = f;

        console.log(f);

        this.fibos.push(f);

    }

  };

We have to use angular 13 for loop to generate the next Fibonacci number and swap variable values.

Program of Prime Number in Angular4

A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.

The Prime sequence of 4 : 2, 3

prime_series(n) {

    var i : any;

    var j : any;

    var notPrime : boolean;

    notPrime = false;

    for (i = 1; i <= n; i++) {

       for(j = 2; j<= i; j++) {

          if (i%j === 0 && j!==i) {
            notPrime = true;
          }
       }

       if(!notPrime) {
         this.prime.push(i);
       }
    }
    console.log(this.prime);
   }

We have used 13 angulars for loops to check prime numbers and stored them into a variable.

Program to Check Even/Odd Number in Angular 13

The even number are those numbers that are divided by 2 and the rest of them are odd.

The Even Number are : 2, 4, 6 …
The Even Number are : 1, 3, 5 …

The following Angular 13 code help to check passed number is even or odd.

check_even(n) {

      console.log(n);

      if(n/2 === 0) {

        console.log(n+' is even');

      } else {

        console.log(n+ ' is odd');

      }

    }