How to Convert Double to Decimal with 4 Places in C#? [4 Methods]

In this C# tutorial explains how to convert double to decimal with 4 places in C#. You might have a requirement to convert double to decimal with 4 places in C#.

Convert Double to Decimal with 4 Places in C#

Let’s understand why we might need to convert double to decimal:

• Precision: Decimal type is more precise and avoids rounding errors, making it ideal for financial calculations.
• Control: Converting to decimal allows you to control the number of decimal places, ensuring data integrity.

Here, we will see 4 different methods to convert double to decimal with 4 places in C#.

• Using The Basic Method
• Using ToString() Method
• Using Math.Round
• Using a Custom Function for Conversion

1. Using The Basic Method

The simplest way to convert a `double` to `decimal` is to use a direct cast. However, this won’t control the number of decimal places.

Here’s a simple C# program to convert double to decimal.

``````using System;

namespace DoubleToDecimalConversion
{
class Program
{
static void Main(string[] args)
{
double myDouble = 123.456789;
decimal myDecimal = (decimal)myDouble;
Console.WriteLine("Converted decimal: " + myDecimal);
}
}
}
``````

Once you run the C# code, you can see the output below:

2. Using ToString() Method

To convert the `double` value to a `decimal` with up to 4 decimal places in C#, you can use the `ToString()` method with a format string:

``````using System;

namespace DoubleToDecimalConversion
{
class Program
{
static void Main(string[] args)
{
double myDouble = 123.456789;
string myString = myDouble.ToString("F4");
decimal myDecimal = Decimal.Parse(myString);
Console.WriteLine("Converted decimal: " + myDecimal);
}
}
}
``````

Once I run the code using Visual Studio, you can see the output below:

This is one of the best approaches to convert double to decimal with 4 places in C#.

3. Using Math.Round() Method

You can also use the C# `Math.Round`() to round the `double` value to 4 decimal places before converting it to `decimal`:

``````using System;

namespace DoubleToDecimalConversion
{
class Program
{
static void Main(string[] args)
{
double myDouble = 123.456789;
double roundedDouble = Math.Round(myDouble, 4);
decimal myDecimal = (decimal)roundedDouble;
Console.WriteLine("Converted decimal: " + myDecimal);
}
}
}
``````

Once you run the code using Visual Studio, you can see the output below:

4. Using a Custom Function

To encapsulate this logic, you can create a custom function to convert `double` to `decimal` with 4 decimal places in C#:

``````using System;

namespace DoubleToDecimalConversion
{
class Program
{
static decimal ConvertToDecimal(double value, int decimalPlaces)
{
double roundedValue = Math.Round(value, decimalPlaces);
return (decimal)roundedValue;
}

static void Main(string[] args)
{
double myDouble = 123.456789;
decimal myDecimal = ConvertToDecimal(myDouble, 4);
Console.WriteLine("Converted decimal: " + myDecimal);
}
}
}
``````

You can see the output below:

Conclusion

Converting double to decimal with 4 decimal places in C# can be done through various methods, such as direct casting, using ToString() for formatting, or employing Math.Round() for rounding. In this C# tutorial, I have explained how to convert double to decimal with 4 places in C#.

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