Operating on integer arrays

Class IntegerArrayOperation provides method Operate(FuncInt32, Int32, Int32) to manage operations on integer values.

In the following example, an integer is squared executing the Operate(FuncInt32, Int32, Int32) method. This is equivalent to define the applied function, say LaTeX equation as

In addition, input validation is also checked.

using System;
using SampleClassLibrary.Advanced;

namespace SampleClassLibrary.CodeExamples.Advanced
{
    public class IntegerArrayOperationExample  
    {
        public void Main()
        {
            // Define an operator that squares its operand
            Func<int, int> square = (int operand) => operand * operand;

            // Define an array of operands
            int[] operands = new int[3] { 2, 4, 8 };

            // Operate on it
            int[] results = IntegerArrayOperation.Operate(square, operands);

            // Show results
            for (int i = 0; i < results.Length; i++)
            {
                Console.WriteLine(
                    "The result of squaring {0} is {1}.",
                    operands[i],
                    results[i]);
            }

            // Check that an operator cannot be null
            try
            {
                IntegerArrayOperation.Operate(null, new int[1]);
            }
            catch (Exception e)
            {
                Console.WriteLine();
                Console.WriteLine("Cannot apply a null function:");
                Console.WriteLine(e.Message);
            }

            // Check that an array of operands cannot be null
            try
            {
                IntegerArrayOperation.Operate(square, null);
            }
            catch (Exception e)
            {
                Console.WriteLine();
                Console.WriteLine("Cannot apply a function to a null array:");
                Console.WriteLine(e.Message);
            }

        }
    }
}

// Executing method Main() produces the following output:
// 
// The result of squaring 2 is 4.
// The result of squaring 4 is 16.
// The result of squaring 8 is 64.
// 
// Cannot apply a null function:
// Value cannot be null.
// Parameter name: func
// 
// Cannot apply a function to a null array:
// Value cannot be null.
// Parameter name: operands

Operating on integer arrays

See Also

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