In this chapter you will learn:
In this chapter you will see some programming examples of using parameter in C#.
Qu 1: Write a program to show difference between value type parameter and reference type parameter.
Answer
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Example1
{
class Program
{
public static void value(int num)
{
num++;
}
public static void reference(ref int num)
{
num++;
}
static void Main(string[] args)
{
int num;
Console.Write("Enter a number:\t");
num = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n\n\tValue Type");
Console.WriteLine("----------------");
Console.Write("\nPrevious Value:\t{0}", num);
Program.value(num);
Console.Write("\nCurrent Value:\t{0}", num);
Console.WriteLine("\n\n\n----------------");
Console.WriteLine("\tReference Type");
Console.WriteLine("--------------------");
Console.Write("\nPrevious Value:\t{0}", num);
Program.reference(ref num);
Console.Write("\nCurrent Value:\t{0}", num);
Console.ReadLine();
}
}
}
Output
Enter a number: 9
Value Type
---------------------------------
Previous Value: 9
Current Value: 9
---------------------------------
Reference Type
---------------------------------
Previous Value: 9
Current Value: 10
__
Qu2: Write a program in which accept two argument as parameter from the user and returns four output value as add, subtract, multiplication and division.
Answer
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Example2
{
class Program
{
public static void parameter(int num1, int num2, out int add, out int sub, out int mul, out float div)
{
add = num1 + num2;
sub = num1 - num2;
mul = num1 * num2;
div = (float)num1 / num2;
}
static void Main(string[] args)
{
int num1, num2;
int add, sub, mul;
float div;
Console.Write("Enter 1st number\t");
num1 = Convert.ToInt32(Console.ReadLine());
Console.Write("\nEnter 2nd number\t");
num2 = Convert.ToInt32(Console.ReadLine());
Program.parameter(num1, num2, out add, out sub, out mul, out div);
Console.WriteLine("\n\n{0} + {1} = {2}", num1, num2, add);
Console.WriteLine("{0} - {1} = {2}", num1, num2, sub);
Console.WriteLine("{0} * {1} = {2}", num1, num2, mul);
Console.WriteLine("{0} / {1} = {2}", num1, num2, div);
Console.ReadLine();
}
}
}Answer
Enter 1st number 7
Enter 2nd number 9
7 +9 = 16
7 - 9 = -2
7 * 9 = 63
7 / 9 = 0.7777778
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Qu3: Write a program in which pass two number as command line argument and displays the multiplication of both number.
Answer
a.Write the following command on notepad and save as commandline.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Example3
{
class Program
{
static void Main(string[] args)
{
int num1, num2, result;
num1 = Convert.ToInt32(args[0]);
num2 = Convert.ToInt32(args[1]);
result = num1 * num2;
Console.WriteLine("{0} x {1} = {2}", num1, num2, result);
}
}
}b.Open visual studio command prompt and set current path of your program.
c.Compile it as
csc commandline.csd.Now execute program as
commandline 5 4
Output
Setting environment for using Microsoft Visual Studio 2008 x86 tools.
C:\Program Files\MIcrosoft Visual Studio 9.0\VC>d:
D:\>csc commandline.cs
Microsoft <R> Visual C# 2008 Compiler version 3.5.30729.1
for Microsoft <R> .NET Framework version 3.5
Copyright <C> Microsoft Corporation. All rights reserved.
D:\>commandline 5 4
5 x 4 = 20
D:\> __
Summary
In this chapter you studied some programming examples of parameter. In next chapter you will do some programming exercises of parameter.