If the number is less than one, the characteristic is negative and is one more than the number of zeros to the right of the decimal point. The characteristic of any number greater than one is positive, and if it is one less than the number of digits to the left of the decimal point in a given number.
Before finding the logarithm of a number, we should know about the characteristic part and mantissa part of a given number To find the logarithm of a number, we can use the logarithm table instead of using a mere calculation. The log function to the base e is called the natural logarithmic function and it is denoted by log e. The log function with base 10 is called the common logarithmic function and it is denoted by log 10 or simply log. The most common bases used in logarithmic functions are base e and base 10. Then the logarithmic function is written as:
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