C# Program for Converting Hexadecimal String to Integer

Last Updated : 02 Jul, 2020

Given an hexadecimal number as input, we need to write a program to convert the given hexadecimal number into equivalent integer. To convert an hexadecimal string to integer, we have to use Convert.ToInt32() function to convert the values.

Syntax:

Convert.ToInt32(input_string, Input_base);

Here,

input_string is the input containing hexadecimal number in string format.
input_base is the base of the input value – for a hexadecimal value it will be 16.

Examples:

Input : 56304
Output : 353028

Input : 598f
Output : 22927

If we input wrong value for eg. 672g, it shows error: Enter a hexadecimal number: System.FormatException: Additional unparsable characters are at the end of the string.

If we input number greater than 8 digit e.g. 746465789, it shows error: Enter a hexadecimal number: System.OverflowException: Arithmetic operation resulted in an overflow.

Program 1:

C#

// C# program to convert array  
// of hexadecimal strings to integers 
using System; 
using System.Text; 
  
class Program { 
    
    static void Main(string[] args) 
    { 
        // hexadecimal number as string 
        string input = "56304"; 
        int output = 0; 
        
        // converting to integer 
        output = Convert.ToInt32(input, 16); 
        
        // to print  the value 
        Console.WriteLine("Integer number: " + output); 
    } 
}

Output:

Integer number: 353028

Program 2:

C#

// C# program to convert array  
// of hexadecimal strings 
// to integers 
using System; 
using System.Text; 
  
namespace geeks { 
    
class GFG { 
    
    static void Main(string[] args) 
    { 
        string input = ""; 
        int output = 0; 
        try { 
            
            // input string 
            Console.Write("Enter a hexadecimal number: "); 
            input = Console.ReadLine(); 
  
            // converting to integer 
            output = Convert.ToInt32(input, 16); 
  
            Console.WriteLine("Integer number: " + output); 
        } 
        catch (Exception ex) { 
            Console.WriteLine(ex.ToString()); 
        } 
  
        // hit ENTER to exit 
        Console.ReadLine(); 
    } 
} 
}

Input:

598f

Output:

Enter a hexadecimal number: 
Integer number: 22927

C Program For Hexadecimal to Decimal Conversion

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C# Program for Converting Hexadecimal String to Integer

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