Java logarithm

java logarithm

How to create a logarithm math function in java with base and argument from input? I want the user to enter one operator to be the base. import tecnoplux.online; int y = 69; double x = tecnoplux.online(y); // this will return the log base e of a number // for log base b (anything else from e) double x. The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric. BOMBER B 3 How this answer. Understanding February already Roubo twice. Take minimize. Post the best sent to.

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These methods are already predefined so, to get the desired output you just need to directly call this function and display in the output screen. Using Scanner Class. Instead of giving input in the code, using Scanner class in Java, we can read input at runtime itself. So, making use of this for our problem, we read the inputs — number whose log has to be found n and the base for log b.

As log is not fixed,it could be anything other than 10 or e. So, the logic here is that, we take another variable c. Until the number n remains greater than 1, we keep dividing the number n with the base b and increment variable c by 1 every time.

After coming out of this iterative loop, we add the number n after iteration to the variable c. Our output for log n base b is approximately now equal to c Just to give you clarity, the output value here is only the approximate value and not the exact value. As we have seen in the first method of this problem, there are predefined methods in Math package to find the log of a number given that its base is either 10 or e.

For base 10, it is Math. But, in the standard method, we took the input in the code itself which is not an efficient way for writing a code. This is because, if it is written in the code itself then, for every testcase, we must go and make changes in the code. So instead, we make use of the Scanner class that is discussed above to read the input number at runtime.

Using Static Method. This method is being made use of in order to increase the readability of the code as well as to make the logic reusable. The logic remains the same here, we read the two inputs- the number and the base. Then the method discussed under the scanner class is made use of.

The resultant value is the subtracted by 1 same as above which is the log of the number for the given base. If the argument is negative infinity, then the result is The computed result must be within 2. The result of tanh for any finite input must have an absolute value less than or equal to 1.

Special cases: If either argument is infinite, then the result is positive infinity. If either argument is NaN and neither argument is infinite, then the result is NaN. The computed result must be within 1 ulp of the exact result. If one parameter is held constant, the results must be semi-monotonic in the other parameter. If the argument is positive infinity, then the result is positive infinity.

Results must be semi-monotonic. The result of expm1 for any finite input must be greater than or equal to If the argument is negative one, then the result is negative infinity. If both arguments are signed zeros, direction is returned unchanged as implied by the requirement of returning the second argument if the arguments compare as equal. If start is infinite and direction has a value such that the result should have a smaller magnitude, Double.

If both arguments are signed zeros, a value equivalent to direction is returned. If start is infinite and direction has a value such that the result should have a smaller magnitude, Float. If the argument is positive infinity, the result is positive infinity. If the argument is zero, the result is Double. If the argument is zero, the result is Float.

If the argument is negative infinity, the result is negative infinity. If the argument is zero, the result is -Double. If the argument is zero, the result is -Float. If the first argument is infinite, then an infinity of the same sign is returned. If the first argument is zero, then a zero of the same sign is returned.

Module java. Package java. Object java. Math public final class Math extends Object The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions. Field Summary Fields Modifier and Type Field Description static double E The double value that is closer than any other to e , the base of the natural logarithms.

The double value that is closer than any other to pi , the ratio of the circumference of a circle to its diameter. Returns the arc cosine of a value; the returned angle is in the range 0. Returns the sum of its arguments, throwing an exception if the result overflows an int.

Returns the sum of its arguments, throwing an exception if the result overflows a long. Returns the angle theta from the conversion of rectangular coordinates x , y to polar coordinates r, theta. Returns the smallest closest to negative infinity double value that is greater than or equal to the argument and is equal to a mathematical integer. Returns the first floating-point argument with the sign of the second floating-point argument.

Returns the argument decremented by one, throwing an exception if the result overflows an int. Returns the argument decremented by one, throwing an exception if the result overflows a long. Returns Euler's number e raised to the power of a double value. Returns the largest closest to positive infinity double value that is less than or equal to the argument and is equal to a mathematical integer.

Returns the largest closest to positive infinity int value that is less than or equal to the algebraic quotient. Returns the largest closest to positive infinity long value that is less than or equal to the algebraic quotient.

Returns the floor modulus of the long and int arguments. Returns the fused multiply add of the three arguments; that is, returns the exact product of the first two arguments summed with the third argument and then rounded once to the nearest double. Returns the fused multiply add of the three arguments; that is, returns the exact product of the first two arguments summed with the third argument and then rounded once to the nearest float.

Returns the unbiased exponent used in the representation of a double. Returns the unbiased exponent used in the representation of a float. Computes the remainder operation on two arguments as prescribed by the IEEE standard.

Returns the argument incremented by one, throwing an exception if the result overflows an int. Returns the argument incremented by one, throwing an exception if the result overflows a long. Returns the product of the arguments, throwing an exception if the result overflows an int. Returns the product of the arguments, throwing an exception if the result overflows a long.

Returns as a long the most significant 64 bits of the bit product of two bit factors. Returns the negation of the argument, throwing an exception if the result overflows an int. Returns the negation of the argument, throwing an exception if the result overflows a long. Returns the floating-point number adjacent to the first argument in the direction of the second argument.

Returns the floating-point value adjacent to d in the direction of negative infinity. Returns the floating-point value adjacent to f in the direction of negative infinity. Returns the floating-point value adjacent to d in the direction of positive infinity. Returns the floating-point value adjacent to f in the direction of positive infinity.

Returns the value of the first argument raised to the power of the second argument. Returns a double value with a positive sign, greater than or equal to 0. Returns the double value that is closest in value to the argument and is equal to a mathematical integer. Returns the closest long to the argument, with ties rounding to positive infinity. Returns the closest int to the argument, with ties rounding to positive infinity. Returns the signum function of the argument; zero if the argument is zero, 1.

Returns the correctly rounded positive square root of a double value. Returns the difference of the arguments, throwing an exception if the result overflows an int. Returns the difference of the arguments, throwing an exception if the result overflows a long. Converts an angle measured in radians to an approximately equivalent angle measured in degrees. Returns the value of the long argument; throwing an exception if the value overflows an int.

Converts an angle measured in degrees to an approximately equivalent angle measured in radians. Field Detail E public static final double E The double value that is closer than any other to e , the base of the natural logarithms. Returns the trigonometric sine of an angle. Returns the trigonometric cosine of an angle. Returns the trigonometric tangent of an angle. Special cases: If the argument is NaN or its absolute value is greater than 1, then the result is NaN.

Special case: If the argument is NaN or its absolute value is greater than 1, then the result is NaN. The conversion from degrees to radians is generally inexact. The conversion from radians to degrees is generally inexact; users should not expect cos toRadians If the argument is negative infinity, then the result is positive zero.

Returns the natural logarithm base e of a double value. If the argument is positive zero or negative zero, then the result is negative infinity. Returns the base 10 logarithm of a double value. If the argument is equal to 10 n for integer n , then the result is n. Otherwise, the result is the double value closest to the true mathematical square root of the argument value. Returns the cube root of a double value.

If the remainder is zero, its sign is the same as the sign of the first argument. Special cases: If either argument is NaN, or the first argument is infinite, or the second argument is positive zero or negative zero, then the result is NaN.

If the first argument is finite and the second argument is infinite, then the result is the same as the first argument. Special cases: If the argument value is already equal to a mathematical integer, then the result is the same as the argument.

If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument. If the argument value is less than zero but greater than Note that the value of Math. If two double values that are mathematical integers are equally close, the result is the integer value that is even. If the first argument is positive zero and the second argument is positive, or the first argument is positive and finite and the second argument is positive infinity, then the result is positive zero.

If the first argument is negative zero and the second argument is positive, or the first argument is negative and finite and the second argument is positive infinity, then the result is negative zero. If the first argument is positive zero and the second argument is negative, or the first argument is positive and finite and the second argument is negative infinity, then the result is the double value closest to pi.

If the first argument is negative zero and the second argument is negative, or the first argument is negative and finite and the second argument is negative infinity, then the result is the double value closest to - pi. The computed result must be within 2 ulps of the exact result. Special cases: If the second argument is positive or negative zero, then the result is 1. If the second argument is 1. If the second argument is NaN, then the result is NaN. If the first argument is NaN and the second argument is nonzero, then the result is NaN.

If the absolute value of the first argument is greater than 1 and the second argument is positive infinity, or the absolute value of the first argument is less than 1 and the second argument is negative infinity, then the result is positive infinity.

If the absolute value of the first argument is greater than 1 and the second argument is negative infinity, or the absolute value of the first argument is less than 1 and the second argument is positive infinity, then the result is positive zero. If the absolute value of the first argument equals 1 and the second argument is infinite, then the result is NaN. If the first argument is positive zero and the second argument is greater than zero, or the first argument is positive infinity and the second argument is less than zero, then the result is positive zero.

If the first argument is positive zero and the second argument is less than zero, or the first argument is positive infinity and the second argument is greater than zero, then the result is positive infinity. If the first argument is negative zero and the second argument is greater than zero but not a finite odd integer, or the first argument is negative infinity and the second argument is less than zero but not a finite odd integer, then the result is positive zero.

If the first argument is negative zero and the second argument is a positive finite odd integer, or the first argument is negative infinity and the second argument is a negative finite odd integer, then the result is negative zero.

If the first argument is negative zero and the second argument is less than zero but not a finite odd integer, or the first argument is negative infinity and the second argument is greater than zero but not a finite odd integer, then the result is positive infinity. If the first argument is negative zero and the second argument is a negative finite odd integer, or the first argument is negative infinity and the second argument is a positive finite odd integer, then the result is negative infinity.

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