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JavaScript conditional statements and loops - Exercises, Practice, Solution

JavaScript conditional statements and loops [ 12 exercises with solution]

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1. Write a JavaScript program that displays the largest integer among two integers.
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2. 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. 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. 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. 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. Write a JavaScript program that computes the average marks of the following students. Then, this average is used to determine the corresponding grade.

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

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

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

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

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JavaScript: Tips of the Day

The unary operator

let num = 10;

const increaseNumber = () => num++;
const increasePassedNumber = number => number++;

const num1 = increaseNumber();
const num2 = increasePassedNumber(num1);

console.log(num1);
console.log(num2);

The unary operator ++ first returns the value of the operand, then increments the value of the operand. The value of num1 is 10, since the increaseNumber function first returns the value of num, which is 10, and only increments the value of num afterwards.
num2 is 10, since we passed num1 to the increasePassedNumber. number is equal to 10(the value of num1. Again, the unary operator ++ first returns the value of the operand, then increments the value of the operand. The value of number is 10, so num2 is equal to 10.

Ref: https://bit.ly/323Y0P6

 

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