JavaScript conditional statements and loops - Exercises, Practice, Solution

JavaScript conditional statements and loops [ 12 exercises with solution]

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1. Largest of Two Integers

Write a JavaScript program that displays the largest integer among two integers.
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2. Sign of Product of Three Numbers

Write a JavaScript conditional statement to find the sign of the product of three numbers. Display an alert box with the specified sign.
Sample numbers : 3, -7, 2
Output : The sign is -
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3. Sort Three Numbers

Write a JavaScript conditional statement to sort three numbers. Display an alert box to show the results.
Sample numbers : 0, -1, 4
Output : 4, 0, -1
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4. Largest of Five Numbers

Write a JavaScript conditional statement to find the largest of five numbers. Display an alert box to show the results.
Sample numbers : -5, -2, -6, 0, -1
Output : 0
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5. Odd or Even Loop

Write a JavaScript for loop that iterates from 0 to 15. For each iteration, it checks if the current number is odd or even, and displays a message on the screen.
Sample Output :
"0 is even"
"1 is odd"
"2 is even"
----------
----------
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6. Student Grades Calculation

Write a JavaScript program that computes the average marks of the following students. Then, this average is used to determine the corresponding grade.

The grades are computed as follows :

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7. FizzBuzz

Write a JavaScript program that iterates integers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for multiples of five print "Buzz". For numbers multiples of both three and five print "FizzBuzz".
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8. Happy Numbers (First 5)

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.
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9. 3-Digit Armstrong Numbers

Write a JavaScript program to find the Armstrong numbers of 3 digits.
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. Pyramid Pattern with Nested Loop

Write a JavaScript program to construct the following pattern, using a nested for loop.

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

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11. GCD of Two Numbers

Write a JavaScript program to compute the greatest common divisor (GCD) of two positive integers.
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12. Sum of Multiples of 3 and 5 under 1000

Write a JavaScript program to sum 3 and 5 multiples under 1000.
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