12 hour clock Multiplication

Given two positive integers num1 and num2, the task is to find the product of the two numbers on a 12-hour clock rather than a number line.

Note: Assume the Clock starts from 0 hours to 11 hours.

Examples:

Input: Num1 = 3, Num2 = 7
Output: 9
Explanation: 3*7 = 21. The time in a 12 hour clock is 9.

Input: Num1 = 3, Num2 = 4
Output: 0

Approach: Follow the steps to solve this problem:

• Calculate Product as Num1*Num2 and store it in a variable Prod.
  • If Prod = 12, return 0.
  • Else If Prod ? 0 and Prod ? 11, return Prod.
  • Else return, Prod % 12.

Note: You can skip all the steps and return (Num1*Num2) % 12 also, it also works fine.

Below is the implementation of the above approach.

9

Time Complexity: O(1)
Auxiliary Space: O(1)