Program to compute Log n

Write a one line C function that calculates and returns $log_2 n$ . For example, if n = 64, then your function should return 6, and if n = 129, then your function should return 7.

Using Recursion

C

// C program to find log(n) using Recursion 
#include <stdio.h> 
  
unsigned int Log2n(unsigned int n) 
{ 
    return (n > 1) ? 1 + Log2n(n / 2) : 0; 
} 
  
int main() 
{ 
    unsigned int n = 32; 
    printf("%u", Log2n(n)); 
    getchar(); 
    return 0; 
}

Java

// Java program to find log(n) 
// using Recursion 
class Gfg1  
{ 
  
    static int Log2n(int n) 
    { 
        return (n > 1) ? 1 + Log2n(n / 2) : 0; 
    } 
      
    // Driver Code 
    public static void main(String args[]) 
    { 
        int n = 32; 
        System.out.println(Log2n(n)); 
    } 
} 
  
// This code is contributed by Niraj_Pandey 

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Python3

# Python 3 program to 
# find log(n) using Recursion 
  
def Log2n(n): 
  
    return 1 + Log2n(n / 2) if (n > 1) else 0
  
# Driver code 
n = 32
print(Log2n(n)) 
  
# This code is contributed by 
# Smitha Dinesh Semwal 

C#

// C# program to find log(n) 
// using Recursion 
using System; 
  
class GFG { 
  
    static int Log2n(int n) 
    { 
        return (n > 1) ? 1 +  
            Log2n(n / 2) : 0; 
    } 
      
    // Driver Code 
    public static void Main() 
    { 
        int n = 32; 
          
        Console.Write(Log2n(n)); 
    } 
} 
  
// This code is contributed by 
// nitin mittal. 

Program to compute Log n

C

Java

Python3

C#

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