C# Hackerrank code produces correct results on Data Types challenge in 30 days of code but says I'm wrong

Question

Recently I have tried to solve Day 1 Data types lesson for the 30 days of Code challenge in hackerrank and I've run into a strange road block.The compiler keeps saying that my output is the wrong answer, but I print out the exact same integer double and string. the only thing that's different is that I don't have a decimal point on my double,which doesn't make sense because The only thing I've done is read from the input,convert the input from a string to a double and then add the two doubles together

Can you guys help? This is my C# code by the way.

using System;
using System.Collections.Generic;
using System.IO;



class Solution {
    static void Main(String[] args) {
        int i = 4;
        double d = 4.0;
        string s = "HackerRank ";

     //this is the start of my code,the top part is preset by hackerrank
int a=Convert.ToInt32(Console.ReadLine());
double x = Convert.ToDouble(Console.ReadLine());
string l = Console.ReadLine();

Console.WriteLine(a+i);
Console.WriteLine(d+x);
Console.WriteLine(s+l);

Console.ReadLine();

}
}

here is there input they want me to use that I am using:

12
4.0
is the best place to learn and practice coding!

Here is my output :

16
8
HackerRank is the best place to learn and practice coding!

And The output they want:

16
8.0
HackerRank is the best place to learn and practice coding!

as you can see my ".0" is missing for my double, any help?

Answer 1

You can use .ToString() with an overload to format your result:

Console.WriteLine((d+x).ToString("#.0"));

the 0 represents a default placeholder, if there is no decimal point it will add 0 . else it will show the actual value.

To answer your comments:

# represents any number preceding the .

Why does it strip the .0 in your case: according to MSDN, Console.WriteLine(double) represents the output as a string using the default ToString("G") overload:

The text representation of value is produced by calling the Double.ToString method. Source

The general ("G") format specifier converts a number to the more compact of either fixed-point or scientific notation, depending on the type of the number and whether a precision specifier is present. Source

According to the documentation above, if you were to change your data type to decimal instead of double the .0 should be preserved.

Answer 2

尝试这个

Console.WriteLine("{0:F1}",d+x);

Answer 3

您可以添加 0.0 使其成为双倍值。