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 | |||||
| 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.
Read more about this topic: Comparison Of Programming Languages (basic Instructions)
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