Tcl_GetInt(), Tcl_GetDouble(), Tcl_GetBoolean()

convert from string to integer, double, or boolean 

Tcl Library Procedures


#include <tcl.h>

int Tcl_GetInt(interp, string, intPtr)

int Tcl_GetDouble(interp, string, doublePtr)

int Tcl_GetBoolean(interp, string, boolPtr)


Tcl_Interp *interp (in) 

Interpreter to use for error reporting.

char *string (in) 

Textual value to be converted.

int *intPtr (out) 

Points to place to store integer value converted from string.

double *doublePtr (out) 

Points to place to store double-precision floating-point value converted from string.

int *boolPtr (out) 

Points to place to store boolean value (0 or 1) converted from string.


These procedures convert from strings to integers or double-precision floating-point values or booleans (represented as 0- or 1-valued integers). Each of the procedures takes a string argument, converts it to an internal form of a particular type, and stores the converted value at the location indicated by the procedure's third argument. If all goes well, each of the procedures returns TCL_OK. If string doesn't have the proper syntax for the desired type then TCL_ERROR is returned, an error message is left in the interpreter's result, and nothing is stored at *intPtr or *doublePtr or *boolPtr.

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.


Windows 8.1. Windows Server 2012 R2. Windows 10. Windows Server 2016. Windows Server 2019. Windows 11. Windows Server 2022.


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