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\DOC num_of_string
\TYPE {num_of_string : string -> num}
\SYNOPSIS
Converts decimal, hex or binary string representation into number.
\DESCRIBE
The call {num_of_string "n"} converts the string {"n"} into an OCaml
unlimited-precision number (type {num}). The string may be simply a sequence of
decimal digits (e.g. {"123"}), or a hexadecimal representation starting with
{0x} as in C (e.g. {"0xFF"}), or a binary number starting with {0b} (e.g.
{"0b101"}).
\FAILURE
Fails unless the string is a valid representation of one of these forms.
\EXAMPLE
{
# num_of_string "0b11000000";;
val it : num = 192
}
\SEEALSO
dest_numeral, mk_numeral.
\ENDDOC
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