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Tcl_GetInt expects string to consist of a collection of integer digits, optionally signed and optionally preceded by white space. If the first two characters of string are ``0x'' then string is expected to be in hexadecimal form; otherwise, if the first character of string is ``0'' then string is expected to be in octal form; otherwise, string is expected to be in decimal form.
Tcl_GetDouble expects string to consist of a floating-point number, which is: white space; a sign; a sequence of digits; a decimal point; a sequence of digits; the letter ``e''; and a signed decimal exponent. Any of the fields may be omitted, except that the digits either before or after the decimal point must be present and if the ``e'' is present then it must be followed by the exponent number.
Tcl_GetBoolean expects string to specify a boolean value. If string is any of 0, false, no, or off, then Tcl_GetBoolean stores a zero value at *boolPtr. If string is any of 1, true, yes, or on, then 1 is stored at *boolPtr. Any of these values may be abbreviated, and upper-case spellings are also acceptable.
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