Tcl\_PrintDouble(3) Tcl Library Procedures Tcl\_PrintDouble(3)

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# [NAME](#NAME)

Tcl\_PrintDouble - Convert floating value to string

# [SYNOPSIS](#SYNOPSIS)

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#include <tcl.h>

Tcl_PrintDouble(interp, value, dst)
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# [ARGUMENTS](#ARGUMENTS)

Tcl\_Interp *\*interp* (in)

This argument is ignored.

double *value* (in)

Floating-point value to be converted.

char *\*dst* (out)

Where to store the string representing *value*. Must have at least **TCL\_DOUBLE\_SPACE** characters of storage.

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# [DESCRIPTION](#DESCRIPTION)

**Tcl\_PrintDouble** generates a string that represents the value of *value* and stores it in memory at the location given by *dst*. It uses **%g** format to generate the string, with one special twist: the string is guaranteed to contain either a “.” or an “e” so that it does not look like an integer. Where **%g** would generate an integer with no decimal point, **Tcl\_PrintDouble** adds “.0”.

The result will have the fewest digits needed to represent the number in such a way that **Tcl\_NewDoubleObj** will generate the same number when presented with the given string. IEEE semantics of rounding to even apply to the conversion.

# [KEYWORDS](#KEYWORDS)

conversion, double-precision, floating-point, string

8.0 Tcl

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Document: Tcl_PrintDouble(3) from tcl 9.1.0-r0 (Chainguard OS)
Source: https://downloads.sourceforge.net/project/tcl/Tcl/9.1.0/tcl9.1.0-src.tar.gz