JavaScript: Power of three

Last update on April 22 2023 12:18:58 (UTC/GMT +8 hours)

JavaScript Math: Exercise-107 with Solution

Write a JavaScript program to check whether a given integer is a power of three or not.

In mathematics, a power of three is a number of the form 3ⁿ where n is an integer – that is, the result of exponentiation with number three as the base and integer n as the exponent.

Test Data:
(27) -> true
(9) -> true
(36) -> false

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript program to Power of three or not</title>
</head>
<body>

</body>
</html>

Solution-1

JavaScript Code:

function test(n) {
 return (Math.log10(n) / Math.log10(3)) % 1 == 0;
}

n = 27
console.log("Number n = " +n)
console.log("Check the said number is power of three or not? "+test(n));
n = 9
console.log("Number n = " +n)
console.log("Check the said number is power of three or not? "+test(n));
n = 36
console.log("Number n = " +n)
console.log("Check the said number is power of three or not? "+test(n));

Sample Output:

Number n = 27
Check the said number is power of three or not? true
Number n = 9
Check the said number is power of three or not? true
Number n = 36
Check the said number is power of three or not? false

Flowchart:

$JavaScript: Power of three.$

Live Demo:

See the Pen javascript-math-exercise-107 by w3resource (@w3resource) on CodePen.

Solution-2

JavaScript Code:

function test(n) {
 if (n < 1) {
    return false;
  }
  while (n % 3 === 0) {
    n = n / 3;
  }
  return n === 1;
}
n = 27
console.log("Number n = " +n)
console.log("Check the said number is power of three or not? "+test(n));
n = 9
console.log("Number n = " +n)
console.log("Check the said number is power of three or not? "+test(n));
n = 36
console.log("Number n = " +n)
console.log("Check the said number is power of three or not? "+test(n));

Sample Output:

Number n = 27
Check the said number is power of three or not? true
Number n = 9
Check the said number is power of three or not? true
Number n = 36
Check the said number is power of three or not? false

Flowchart:

$JavaScript: Power of three.$

Live Demo:

See the Pen javascript-math-exercise-107-1 by w3resource (@w3resource) on CodePen.

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