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JavaScript conditional statements and loops - Exercises, Practice, Solution

JavaScript conditional statements and loops [ 12 exercises with solution]

[An editor is available at the bottom of the page to write and execute the scripts.]

1. Write a JavaScript program that accept two integers and display the larger.Go to the editor
Click me to see the solution

2. Write a JavaScript conditional statement to find the sign of product of three numbers. Display an alert box with the specified sign. Go to the editor
Sample numbers : 3, -7, 2
Output : The sign is -
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3. Write a JavaScript conditional statement to sort three numbers. Display an alert box to show the result. Go to the editor
Sample numbers : 0, -1, 4
Output : 4, 0, -1
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4. Write a JavaScript conditional statement to find the largest of five numbers. Display an alert box to show the result. Go to the editor
Sample numbers : -5, -2, -6, 0, -1
Output : 0
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5. Write a JavaScript for loop that will iterate from 0 to 15. For each iteration, it will check if the current number is odd or even, and display a message to the screen. Go to the editor
Sample Output :
"0 is even"
"1 is odd"
"2 is even"
----------
----------
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6. Write a JavaScript program which compute, the average marks of the following students Then, this average is used to determine the corresponding grade. Go to the editor

Student Name Marks
David 80
Vinoth 77
Divya 88
Ishitha 95
Thomas 68

The grades are computed as follows :

Range Grade
<60 F
<70 D
<80 C
<90 B
<100 A

Click me to see the solution

7. Write a JavaScript program which iterates the integers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both three and five print "FizzBuzz". Go to the editor
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8. According to Wikipedia a happy number is defined by the following process :
"Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers (or sad numbers)".
Write a JavaScript program to find and print the first 5 happy numbers. Go to the editor
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9. Write a JavaScript program to find the armstrong numbers of 3 digits. Go to the editor
Note : An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 371 is an Armstrong number since 3**3 + 7**3 + 1**3 = 371.
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10. Write a JavaScript program to construct the following pattern, using a nested for loop. Go to the editor 

*  
* *  
* * *  
* * * *  
* * * * *

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11. Write a JavaScript program to compute the greatest common divisor (GCD) of two positive integers. Go to the editor
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12. Write a JavaScript program to sum the multiples of 3 and 5 under 1000. Go to the editor
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More to Come !

* To run the code mouse over on Result panel and click on 'RERUN' button.*

Live Demo

See the Pen javascript-common-editor by w3resource (@w3resource) on CodePen.


Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04