**Objective**: Given a number n and r, write a program to calculate Log_{r}n

**Example**:

N = 32, r =2 Log_{2}32= 5 N = 64, r = 4 Log_{4}64= 3

**Approach**:

**Without using built-In function-**

- Initialize result = 0.
- Keep dividing the given number by r till number is greater than 0 and add one to the result if n is greater than equal to 1.

**Java Code:**

**Output:**

Log64 with base 4 value: 3.0

**Using built-In function-**

- Use Java built in function to compute.

**Java Code:**

**Output:**

Log64 with base 4 value: 3.0