What does the error "Cannot implicitly convert "void" to "int" refer to?

Question

My goal is to calculate percentage, while trying to run the code below I get the error message:

"Cannot convert type implicitly void in int.

As I correct?

int var1 = Console.WriteLine("Insira bullshit");
int var2 = Console.WriteLine("Insira bullshit");
int Resultado = var1 / 100 * var2;

Console.ReadLine(); 
Console.WriteLine($"Resultado: {Resultado}");

Answer 1

The method WriteLine() has as return void, ie returns nothing, then has no value in the execution of it, and is trying to store a value in the variable, this is not possible, need to use a method that returns some value to be able to store in the variable, and in the specific case has to be a type int, so I could not indicate the ReadLine() also that returns a string.

But what you want seems to be for someone to type something, the question is not clear on this and without understanding the problem becomes complicated to find a suitable solution, I will guess that it is this. Then you’ll have to use the ReadLine() to take the typed data, convert it to intsafely and then you can use in the desired calculation, luckily this is one of the exercises that people post most here and has a lot of code that you can see how is the right.

Of course you will only learn if you understand what each thing does, so it would be good to do new research on the subject, right here on the site there is a lot, and if you do not have can ask a new more specific questions.

I’m not going to put the code here because it doesn’t make sense to put another example of how to use the ReadLine() in the right way has a huge amount of questions that this has already been demonstrated and would even make the question as duplicate if it went this way:

• When I type broken number, it removes the comma and sums as integer
• Read a console line in C#
• Understand "," as "." when formatting
• Why my variable does not change the value?
• Error when calculating average
• How do I receive a value for each double variable in the console?
• Error comparing numbers and checking if they are equal
• Reading user information
• How to invert a positive number to negative and vice versa in C#?
• Doubt Console.Readline

Answer 2

Console.Writeline is to display information on screen in a program Console Application, to pick up values typed on the screen the command is Console.Readline.

Your code can be made like this:

public class Program
{
    public static void Main()
    {
        decimal var1 = 0;
        decimal var2 = 0;
        if (decimal.TryParse(System.Console.ReadLine(), out var1) &&
            decimal.TryParse(System.Console.ReadLine(), out var2))
        {
            decimal Resultado = (var1 / 100) * var2;
            System.Console.WriteLine(var1);
            System.Console.WriteLine(var2);
            System.Console.WriteLine(Resultado);
        }
        else
        {
            System.Console.WriteLine("Error");
        }
    }
}

and when you work with division it’s best to work with data type decimal because a division can return values with commas.

^Reference:

• Console.Writeline
• Console.Readline