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**log10** reads its standard input, which should be in text form
and should contain two positive numbers (*x* and *y*) on each line, separated
by spaces or tabs. The standard output of **log10** contains four columns of
numbers, separated by spaces: the common (base 10) logarithms of *x* and
*y*, and the *x* and *y* values. To avoid underflow, if any input is less than
**MINDOUBLE** (defined in *<values.h>* as the smallest positive value that can be
represented as a double-precision floating point quantity), it is replaced
by that value.

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Updated 28 May 2015