log |
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log |
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log |
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log |
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double log( double x )
double x; /* a double value */
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Synopsis |
#include "math.h"
The log function calculates the natural logarithm of x , for x greater than 0.
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Parameters |
x is a double greater than 0.
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Return Value |
log returns the computed value if x is greater than 0. Otherwise, if x is negative log sets errno (the system error variable) to EDOM , or if x is 0, log sets errno to ERANGE . log returns a value equal to the negative of HUGE_VAL (approximately -1.79769e+308) in both error cases.
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See Also |
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