Why do we need to convert the data types?

Question

There is no need to convert the data types.
For example:-

We write

String a;
a=Console.ReadLine();

And convert

int b=Convert.ToInt32(Console.ReadLine()) ;

Simply we can do

String a=Console.ReadLine();
int b=Console.ReadLine() ; //here the data types have already been taken by us.

Answer 1

Console.ReadLine() return a string, you need to manually convert it. It does not give it back as a specific type else than string as its not ensured that the entered string actually is meant to be an int.

You can write your own function though using generic type arguments.

T ReadLine<T>()
{
return (T) System.Convert.ChangeType(Console.ReadLine(), typeof(T));
}

You'd use it like this then:

string a = ReadLine<string>();
int b = ReadLine<int>();
float c = ReadLine<float>();

Its not the best way though.. Ideally you'd be using for example int.TryParse to prevent errors if the entered string is no valid int.

Answer 2

To Sarthak, 👆

Your
int b = Console.ReadLine() will not work, it'll produce an ❌ error.

Just like what @LetSPlaYRagE23 © said,
Console.ReadLine() returns a String value. ✔

And you cannot 🚫 save a String value to a variable with an Integer Data Type.

You may either use:
🅰
int b = int.Parse(Console.ReadLine());
(just like what @LetSPlaYRagE23 © said)

or

🅱
int b = Convert.ToInt32(Console.ReadLine());

And regarding your question in why we need to convert Data Types. ❔

That is because, variables only accept values that are of similar Data Type with them. ✔

Hope that helps! 😁

Answer 3

a simple thing you should remember is...watever u input from console.readline() that takes ur input as string....so it must be converted if u want to assign it to an integer type