By 22/07/2015 11 Comments

C# Nested While Loops

  • Declaration of one or more while loops inside other while loop’s body is called nested while loops.
  • The while loop which is declared inside other while loop is called inner while loop.
  • Nested while loop is very useful for creating programs which has more than one dimensions such as rows and columns, a basic calculator layout, different shapes etc.
  • Using nested while loops we can access multidimensional array’s elements easily.
  • Nested loops are used for complex programs.


using System;
namespace csharpBasic
    // Start class definition / declaration.
    class Program
        // Static main method void type declaration.
        static void Main(string[] args)
            // Initialize an int type sum with 0.
            int sum = 0;

            // Initialize an int type outerLoopNumber with 1.
            int outerLoopNumber = 1;

            while (outerLoopNumber <= 3)
            { // Outer while loop scope starts.

                // Initialize innerLoopNumber with value 1.
                int innerLoopNumber = 1;

                while (innerLoopNumber <= 3)
                { // Inner while loop scope starts.

                    // Add number 1 to sum variable each time.
                    sum += 1;

                    // Print sum variable.
                    Console.Write(" {0}", sum);

                    // Increment innerLoopNumber by 1 each time.

                } // Inner while loop scope ends.

                // outerLoopNumber variable will be incremented by 1 every time.

            } // Outer while loop scope ends.


        } // End of main method definition. 
    } // End of class. 

   The Output will be:
   1 2 3
   4 5 6
   7 8 9

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Posted in: C# Basics, C#.NET

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