C program or source code that calculates and returns logarithm . For example, if n = 64, then your function should return 6, and if n = 129, then your function should return 7. Let us see how to use **C program** to find logarithm of number.

Following is a solution using recursion for C program to find logarithm of number.

#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; }

Let us try an extended version of the problem.

Writing a one line function Logn(n ,r) which returns . Following is the solution for the extended problem to C program to find logarithm of a number with any base.

#include<stdio.h> unsigned int Logn(unsigned int n, unsigned int r) { return (n > r-1)? 1 + Logn(n/r, r): 0; } int main() { unsigned int n = 256; unsigned int r = 4; printf("%u", Logn(n, r)); getchar(); return 0; }

Let us know if you face any issues in compiling the codes. Write in form of comments.

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This code will give you just the interger value. It will not return the decimal part.