Comparison of Programming Languages (basic Instructions)

Type Conversions

Where string is a signed decimal number:

	string to integer	string to long integer	string to floating point	integer to string	floating point to string
ALGOL 68 with general, and then specific formats	With prior declarations and association of: string buf := "12345678.9012e34 "; file proxy; associate(proxy, buf);
	get(proxy, ivar);	get(proxy, livar);	get(proxy, rvar);	put(proxy, ival);	put(proxy, rval);
	getf(proxy, ($g$, ivar)); or getf(proxy, ($dddd$, ivar));	getf(proxy, ($g$, livar)); or getf(proxy, ($8d$, livar));	getf(proxy, ($g$, rvar)); or getf(proxy, ($8d.4dE2d$, rvar));	putf(proxy, ($g$, ival)); or putf(proxy, ($4d$, ival));	putf(proxy, ($g(width, places, exp)$, rval)); or putf(proxy, ($8d.4dE2d$, rval)); etc.
C (C99)	integer = atoi(string);	long = atol(string);	float = atof(string);	sprintf(string, "%i", integer);	sprintf(string, "%f", float);
Objective-C	integer = ;	long = ;	float = ;	string = ;	string = ;
C++ (STL)	«std::»istringstream(string) >> number;			«std::»ostringstream o; o << number; string = o.str;
C++11	integer = «std::»stoi(string);	long = «std::»stol(string);	float = «std::»stof(string); double = «std::»stod(string);	string = «std::»to_string(number);
C#	integer = int.Parse(string);	long = long.Parse(string);	float = float.Parse(string); or double = double.Parse(string);	string = number.ToString;
D	integer = std.conv.to!int(string)	long = std.conv.to!long(string)	float = std.conv.to!float(string) or double = std.conv.to!double(string)	string = std.conv.to!string(number)
Java	integer = Integer.parseInt(string);	long = Long.parseLong(string);	float = Float.parseFloat(string); or double = Double.parseDouble(string);	string = Integer.toString(integer);	string = Float.toString(float); or string = Double.toString(double);
JavaScript	integer = parseInt(string);		float = parseFloat(string); or float = new Number (string) or float = Number (string) or float = string*1;	string = number.toString ; or string = new String (number); or string = String (number); or string = number+"";
Go	integer, error = strconv.Atoi(string) or integer, error = strconv.ParseInt(string, 10, 0)	long, error = strconv.ParseInt(string, 10, 64)	float, error = strconv.ParseFloat(string, 64)	string = strconv.Itoa(integer) or string = strconv.FormatInt(integer, 10) or string = fmt.Sprint(integer)	string = strconv.FormatFloat(float) or string = fmt.Sprint(float)
Common Lisp	(setf integer (parse-integer string))		(setf float (read-from-string string))	(setf string (princ-to-string number))
Scheme	(define number (string->number string))			(define string (number->string number))
ISLISP	(setf integer (convert string ))		(setf float (convert string ))	(setf string (convert number ))
Pascal	integer := StrToInt(string);		float := StrToFloat(string);	string := IntToStr(integer);	string := FloatToStr(float);
Visual Basic	integer = CInt(string)	long = CLng(string)	float = CSng(string) or double = CDbl(string)	string = CStr(number)
Visual Basic .NET	integer = CInt(string)	long = CLng(string)	float = CSng(string) or double = CDbl(string)	string = CStr(number)
Python	integer = int(string)	long = long(string)	float = float(string)	string = str(number)
S-Lang	integer = atoi(string);	long = atol(string);	float = atof(string);	string = string(number);
Fortran	READ(string,format) number			WRITE(string,format) number
PHP	integer = intval(string); or integer = (int)string;		float = floatval(string); or float = (float)string;	string = "number"; or string = strval(number); or string = (string)number;
Perl	number = 0 + string;			string = "number";
Perl 6	number = +string;			string = ~number;
Ruby	integer = string.to_i or integer = Integer(string)		float = string.to_f or float = Float(string)	string = number.to_s
Windows PowerShell	integer = string	long = string	float = string	string = number; or string = "number"; or string = (number).ToString
OCaml	let integer = int_of_string string		let float = float_of_string string	let string = string_of_int integer	let string = string_of_float float
F#	let integer = int string	let integer = int64 string	let float = float string	let string = string number
Standard ML	val integer = Int.fromString string		val float = Real.fromString string	val string = Int.toString integer	val string = Real.toString float
Haskell (GHC)	number = read string			string = show number

^a JavaScript only uses floating point numbers so there are some technicalities.
^b Perl doesn't have separate types. Strings and numbers are interchangeable.

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—Leon Trotsky (1879–1940)

Comparison of Programming Languages (basic Instructions) - Type Conversions

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