C#: Reverse the digits of a given signed 32-bit integer

Last update on August 25 2025 12:48:57 (UTC/GMT +8 hours)

Write a C# Sharp program to reverse the digits of a 32-bit signed integer.

Sample Solution:

C# Sharp Code:

using System;
namespace exercises {
  class Program {
    static void Main(string[] args) {
      int n;
      n = 123456;
      Console.WriteLine("Original Integer value: " + n);
      Console.WriteLine("Reverse the digits of the said signed integer value:");
      Console.WriteLine(reverse_integer(n));
      n = -7654;
      Console.WriteLine("Original Integer value: " + n);
      Console.WriteLine("Reverse the digits of the said signed integer value:");
      Console.WriteLine(reverse_integer(n));	  
      n = 100;
      Console.WriteLine("Original Integer value: " + n);
      Console.WriteLine("Reverse the digits of the said signed integer value:");
      Console.WriteLine(reverse_integer(n));		  
    }

    public static int reverse_integer(int x)
        {
            var result = 0;

            var max_val = int.MaxValue / 10;
            var min_val = int.MinValue / 10;

            for (; x != 0; x /= 10)
            {
                if (result > max_val || result < min_val)
                {
                    return 0;
                }
                result = result * 10 + x % 10;
            }

            return result;
        }
  }
}

Sample Output:

Original Integer value: 123456
Reverse the digits of the said signed integer value:
654321
Original Integer value: -7654
Reverse the digits of the said signed integer value:
-4567
Original Integer value: 100
Reverse the digits of the said signed integer value:
1

Flowchart:

$Flowchart: C# Sharp Exercises - Reverse the digits of a given signed 32-bit integer.$

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C# Sharp Code Editor:

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