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### D.11.3 `math` library conversion functions

The conversion function `strtod` takes a string representing a floating point number in C format to its representation. This function is the primary means of creating or initializing floating point numbers in virtual code. A value of floating point 0.0 is returned if the string is not valid, but no exception is raised.

The conversion `asprintf` is similar to the one by that name in C, but requires a pair `(f,x)` as an argument. The left side f is a character string containing a C style format conversion for exactly one double precision floating point number, such as `'%0.4e'`, and the parameter x is a floating point number. The result returned will be a character string expressing the number in the specified format.

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