This program is a given delegate program. Methods in the class are static. 2nd program is the same one but I made the method non-static. How to complete the program if the methods in the class are non-static.
1st program
using System;
public class MathOperations
{
public static double MultiplyByTwo(double value)
{
return value * 2;
}
public static double Square(double value)
{
return value * value;
}
}
//We call up these methods like this:
delegate double DoubleOp(double x);
class Application
{
static void Main()
{
DoubleOp[] operations =
{
MathOperations.MultiplyByTwo,
MathOperations.Square
};
for (int i = 0; i < operations.Length; i++)
{
Console.WriteLine("Using operations[{0}]:", i);
ProcessAndDisplayNumber(operations[i], 2.0);
ProcessAndDisplayNumber(operations[i], 7.94);
ProcessAndDisplayNumber(operations[i], 1.414);
Console.WriteLine();
}
Console.ReadKey();
}
static void ProcessAndDisplayNumber(DoubleOp action, double value)
{
double result = action(value);
Console.WriteLine(
"Value is {0}, result of operation is {1}", value, result);
}
}
/*
Using operations[0]:
Value is 2, result of operation is 4
Value is 7.94, result of operation is 15.88
Value is 1.414, result of operation is 2.828
Using operations[1]:
Value is 2, result of operation is 4
Value is 7.94, result of operation is 63.0436
Value is 1.414, result of operation is 1.999396
*/
2nd program
using System;
public class MathOperations
{
public double MultiplyByTwo(double value) //Made non-static method
{
return value * 2;
}
public double Square(double value) //Made non-static method
{
return value * value;
}
}
//We call up these methods like this:
delegate double DoubleOp(double x);
class Application
{
static void Main()
{
MathOperations mo = new MathOperations();
DoubleOp doubleOp1 = new DoubleOp(mo.MultiplyByTwo);
DoubleOp doubleOp2 = new DoubleOp(mo.Square);
DoubleOp[] operations =
{
doubleOp1.MultiplyByTwo,
doubleOp2.Square
};
for (int i = 0; i < operations.Length; i++)
{
Console.WriteLine("Using operations[{0}]:", i);
ProcessAndDisplayNumber(operations[i], 2);
ProcessAndDisplayNumber(operations[i], 7.94);
ProcessAndDisplayNumber(operations[i], 1.414);
Console.WriteLine();
}
Console.ReadKey();
}
static void ProcessAndDisplayNumber(DoubleOp action, double value)
{
double result = action.Invoke(value);
Console.WriteLine(
"Value is {0}, result of operation is {1}", value, result);
}
}
Amit ChoudharyPosted Nov 4, 2015, 3:14 PM
DoubleOp[] operations = {MahaPosted Nov 5, 2015, 6:30 AM
In the 1st program where is DELEGATE instantiation?
MahaPosted Nov 4, 2015, 4:20 PM