![]() ![]() ![]() We can also use the numerical method to compute the logarithm result by using bisection, the Newton-Raphson, or any other nonlinear equation-solving method to get more precise results. The fractional part is removed in this solution. This method is faster but can only work well when we need an integer or floor value result. We shift the result towards the right one by one and increase the counter to get the final result when the number is reaching 0. The third method that we have discussed that is using a bitwise shift operator. Another method can be using another log base with a little log formula as shown in the second section. This will return the result in an integer or fraction. ConclusionĬomputing log-base 2 can be done using the cmath library-based log2() method. So the shifting operator can only work on integer-based results. A pre-calculated table can also be of use if only a range of bases and logarithms are of interest on a daily basis. A general solution is to calculate logs using power series or the arithmetic-geometric mean. See, in this output, for the last two inputs, the result is in integer format, and these are the floor value for the actual log-base 2 result. How to calculate logarithms Certain logarithms can be easy to compute in your mind, e.g. It is given as the number of times 2 should be multiplied to give the X. Use log2( x ) to calculate the log base 2 for x. Log base 2 of a number is also known as the binary logarithm.Let us see the syntax and corresponding program to see its usage. Using this method is very easy, it needs the cmath library to import this function then call it simply with a numeric parameter, and it will automatically compute the log base 2 for that number. The answer may be an integer or floating point number. The log2() is one library function that is used to calculate the logarithm base 2 for a given parameter. In this article, we shall discuss a few techniques to compute logarithm base 2 for a given number in C++. ![]() While using programming, we have a handful of options to calculate logarithm results from library functions and also some tricks to compute them. There are a few shortcut methods to remember a few log values for competitive exams. In different applications calculating logarithms for base 2 is somewhat necessary. ![]()
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