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log(x as float) in Math Library Functions of Programming in CPP
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Usage 
The Log function is used to return logarithm value of given number.
Syntax 
log(number)
Example
	#include <stdio.h>    
	#include <math.h>   
	
	int main ()
	{
	  double logarithm=2;
	  printf ("The logarithm value=", log(logarithm));
	  return 0;
	}
Output 
The logarithm value=0.3010
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