What are type conversions between integer and string in Dlang?

Overview

Strings and integers are the most commonly used data types in software programs. Many languages provide ways to make the conversion of values between these two data types very easy.

In Dlang, a method called to! is part of std.conv module. So, to use this method, we’ll import this module.

string and integer conversions

Although there are other methods that can be used to convert from one data type to another in D language. But using to! is simple especially if we want to make conversions between string and int.

Syntax

to!dataType(value)

Return value

This method returns the converted value with a new data type.

Parameters

In the syntax above:

  • dataType: The data type we wish to convert our value to. To convert to an integer dataType will be int and to a string it will be string
  • value: The variable to be converted to another data type.

Code

Let’s look at the code below:

import std.stdio;
import std.conv;
void main(){
// define a string and an int variable
string name = "10";
int height = 500;
//converting 
auto strConv = to!int(name);
auto intConv = to!string(height);
// printing to  display the type of each new variable
writeln("type: ", typeof(strConv).stringof); 
writeln("type: ", typeof(intConv).stringof); 
  writeln("type: ", intConv); 
}

Explanation

In the above code, a string is converted to an integer and an integer to a string value:

  • Lines 1 and 2: We import necessary modules using the std.conv for the type conversion.

  • Lines 7 and 8: We define the values to be converted.

  • Lines 11 and 12: We use the statements to!int and 1to!stringfor type conversion from string to int and int to string, respectively. The value is saved as type auto which allows it to take any type assigned to it.

  • Lines 15 and 16: We display the variable types of strConv and intConv using the typeof built-in method.

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