# C# program to convert a decimal number into a hexadecimal number

Here, we are going to learn how to convert a decimal number into a hexadecimal number in C#?
Submitted by Nidhi, on September 14, 2020

Here we will read a decimal number then convert the entered number into hexadecimal.

Program:

The source code to convert a decimal number into hexadecimal number is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

```//C# program to convert a decimal number into hexadecimal number.

using System;
using System.Globalization;

class ConvertDemo
{
static void Main()
{
int decNum=0;

int i   = 0;
int rem = 0;

string hexNum  = "";

Console.Write("Enter a Decimal Number :");

while (decNum != 0)
{
rem = decNum % 16;
if (rem < 10)
rem = rem + 48;
else
rem = rem + 55;

hexNum += Convert.ToChar(rem);
decNum = decNum / 16;
}

Console.Write("Hexa-decimal number :");
for (i = hexNum.Length - 1; i >= 0; i--)
Console.Write(hexNum[i]);

Console.WriteLine();
}
}
```

Output:

```Enter a Decimal Number :30
Hexa-decimal number :1E
Press any key to continue . . .
```

Explanation:

In the above program, we create a class ConvertDemo that contains the Main() method, In the Main() method we read a decimal number from the keyboard and then convert the decimal number into a corresponding hexadecimal number.

```while (decNum != 0)
{
rem = decNum % 16;
if (rem < 10)
rem = rem + 48;
else
rem = rem + 55;

hexNum += Convert.ToChar(rem);
decNum = decNum / 16;
}
```

In the above code, we find the remainder of the decimal number after dividing by 16 and then concatenated into the string that will contain a reversed hex number.

```Console.Write("Hexa-decimal number :");
for (i = hexNum.Length - 1; i >= 0; i--)
Console.Write(hexNum[i]);
```

In the above code, we print the string in reverse order that will print correct hex number on the console screen.

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