- NAME
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log - Returns the natural logarithm of parameter x.
- SYNOPSIS
#include <math.h>
double log(double x);- DESCRIPTION
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The log() function returns the natural logarithm of x.
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Warning
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You’ll also need to link the program against the math library (see example below) using the -lm compile/link option.
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- RETURN VALUE
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Logarithm naturalis of x.
- ERRORS
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EDOM - The argument x is negative.
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ERANGE - The argument x is zero. The log of zero is not defined.
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- SEE ALSO
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log10, exp, pow, sqrt
- EXAMPLE
link:src/log.c[role=include]- OUTPUT
$ gcc -Wall -lm log.c $ ./a.out ln(5.500000) = 1.704748