Downloaded 103 times
![Method without parameter and No return value
static void Main(string[] args)
{
greet();
Console.ReadKey();
}
static void greet()
{
Console.WriteLine("Hello");
}
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![static void Main(string[] args)
{
greet("Mr. Anderson");
Console.ReadKey();
}
static void greet(string name)
{
Console.WriteLine("Hello " + name);
}
Method with Parameters but No Return value
Mr. Anderson
name
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![Method With Parameters and Return value
static void Main(string[] args)
{
int no1 = 10, no2 = 20;
int result = add(no1, no2);
Console.WriteLine("Result = {0}", result);
Console.ReadKey();
}
static int add(int no1, int no2)
{
int result = no1 + no2;
return result;
}
no1
10
no2
20
no1
10
no2
20
result
30
result
30
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![Compact Format
static void Main(string[] args)
{
Console.WriteLine(add(25,50));
}
static int add(int no1, int no2)
{
return no1 + no2;
}
no1
25
no2
50
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![Fn without Parameter but with return value
static void Main(string[] args)
{
Console.WriteLine(GetTime());
Console.ReadKey();
}
static string GetTime()
{
string time = DateTime.Now.ToShortTimeString();
return time;
}
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![static void Main(string[] args)
{
int no1 = 25, no2 = 50;
Console.WriteLine("Before swaping: no1 = {0}, no2 = {1}", no1, no2);
Swap(ref no1, ref no2);
Console.WriteLine("After swaping: no1 = {0}, no2 = {1}", no1, no2);
Console.ReadKey();
}
static void Swap(ref int no1,ref int no2)
{
int temp = no1;
no1 = no2;
no2 = temp;
}
ref keyword
25
no1
5420
50
no2
5424
5420
no1
5424
no2
25
temp
50 25
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![out keyword
static void Main(string[] args)
{
float radius, area, circumference;
Console.WriteLine("Enter Radius of Circle: ");
radius = Convert.ToInt32(Console.ReadLine());
Calculate(radius, out area, out circumference);
Console.WriteLine("Area = " + area);
Console.WriteLine("Circumference = " + circumference);
}
static void Calculate(float radius, out float area, out float circumference)
{
const float pi = 3.14f;
area = 2 * pi * radius;
circumference = pi * radius * radius;
}
radius
5420
5
area
5424
circum
5428
78.5
radius
5
area
5424
circum
5428
31.4
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![Passing string by value
static void Main(string[] args)
{
string str = "Milkyway";
Console.WriteLine("str = " + str);
ChangeString(str);
Console.WriteLine("nstr = " + str);
}
static void ChangeString(string str)
{
Console.WriteLine("nstr = " + str);
str = "Andromeda";
Console.WriteLine("nstr = " + str);
}
5028 Milkyway
Andromeda
5028
5028
6252
6252
str
str
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![Passing string by reference
static void Main(string[] args)
{
string str = "Milkyway";
Console.WriteLine("str = " + str);
ChangeString(ref str);
Console.WriteLine("nstr = " + str);
Console.ReadKey();
}
static void ChangeString(ref string str)
{
Console.WriteLine("nstr = " + str);
str = "Andromeda";
Console.WriteLine("nstr = " + str);
}
5028 Milkyway
Andromeda
5028
6252
6252
2020
2020
str
str
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![Passing Array by value
static void Main(string[] args)
{
int[] marks = new int[] { 10, 20, 30 };
Console.WriteLine(marks[0]);
ChangeMarks(marks);
Console.WriteLine(marks[0]);
}
static void ChangeMarks(int[] marks)
{
Console.WriteLine(marks[0]);
marks[0] = 70;
Console.WriteLine(marks[0]);
}
5028
5028
10 20 30
5028
marks
marks
70
www.dotnetvideotutorial.com](https://image.slidesharecdn.com/methods-131011211242-phpapp01/75/Methods-17-2048.jpg)
![Passing variable number of arguments
static void Main(string[] args)
{
Console.Write("Humans : ");
printNames("Neo", "Trinity", "Morphious", "Seroph");
Console.Write("Programs : ");
printNames("Smith", "Oracle");
}
static void printNames(params string[] names)
{
foreach (string n in names)
{
Console.Write(n + " ");
}
Console.WriteLine();
}
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![Named Arguments
static void Main(string[] args)
{
int area1 = CalculateArea(width:10,height:15);
Console.WriteLine(area1);
int area2 = CalculateArea(height: 8, width: 4);
Console.WriteLine(area2);
}
static int CalculateArea(int width, int height)
{
return width * height;
}
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![Optional Parameters
static void Main(string[] args)
{
Score(30, 70, 60, 80);
Score(30, 70, 60);
Score(30, 70);
}
static void Score(int m1,int m2,int m3 = 50,int m4 = 30)
{
Console.WriteLine(m1 + m2 + m3 + m4);
}
www.dotnetvideotutorial.com](https://image.slidesharecdn.com/methods-131011211242-phpapp01/75/Methods-21-2048.jpg)
Uploaded byBhushan Mulmule
Methods
The document covers programming methods in C#, focusing on how to define and use methods with various parameters, including by value and by reference techniques. It explains the use of the 'ref' and 'out' keywords for passing variables and demonstrates method examples like addition, greeting, and area calculation. Additionally, it highlights the use of variable arguments, named arguments, and optional parameters.
More Related Content
Methods
- 1.
- 2.
- 3. Methods Passing value types By Value By Reference Passing reference types ByValue By Reference Agenda Features Variable arguments Named arguments Optional parameters
- 4. Methods A methodis a code block containing a series of statements. Methods are declared within a class or struct by specifying Access Modifier Other Modifiers Return value Name of the method Method parameters. public static int add(int no1, int no2) { } www.dotnetvideotutorial.com
- 5. Possible Combinations • Methodwithout parameter and no return value void fun1() • Method with parameter and no return value void fun2(string name) • Method with parameter and return value int fun3(int no1, int no2) • Method without parameter but with return value string fun4()
- 6. Method without parameterand No return value static void Main(string[] args) { greet(); Console.ReadKey(); } static void greet() { Console.WriteLine("Hello"); } www.dotnetvideotutorial.com
- 7. static void Main(string[]args) { greet("Mr. Anderson"); Console.ReadKey(); } static void greet(string name) { Console.WriteLine("Hello " + name); } Method with Parameters but No Return value Mr. Anderson name www.dotnetvideotutorial.com
- 8. Method With Parametersand Return value static void Main(string[] args) { int no1 = 10, no2 = 20; int result = add(no1, no2); Console.WriteLine("Result = {0}", result); Console.ReadKey(); } static int add(int no1, int no2) { int result = no1 + no2; return result; } no1 10 no2 20 no1 10 no2 20 result 30 result 30 www.dotnetvideotutorial.com
- 9. Compact Format static voidMain(string[] args) { Console.WriteLine(add(25,50)); } static int add(int no1, int no2) { return no1 + no2; } no1 25 no2 50 www.dotnetvideotutorial.com
- 10. Fn without Parameterbut with return value static void Main(string[] args) { Console.WriteLine(GetTime()); Console.ReadKey(); } static string GetTime() { string time = DateTime.Now.ToShortTimeString(); return time; } www.dotnetvideotutorial.com
- 11. ref andout keyword used to pass arguments by reference ref: to pass references of initialized variables out: to pass references of uninitialized variables value type as well as reference type can be passed by reference Passing References www.dotnetvideotutorial.com
- 12. static void Main(string[]args) { int no1 = 25, no2 = 50; Console.WriteLine("Before swaping: no1 = {0}, no2 = {1}", no1, no2); Swap(ref no1, ref no2); Console.WriteLine("After swaping: no1 = {0}, no2 = {1}", no1, no2); Console.ReadKey(); } static void Swap(ref int no1,ref int no2) { int temp = no1; no1 = no2; no2 = temp; } ref keyword 25 no1 5420 50 no2 5424 5420 no1 5424 no2 25 temp 50 25 www.dotnetvideotutorial.com
- 13. out keyword static voidMain(string[] args) { float radius, area, circumference; Console.WriteLine("Enter Radius of Circle: "); radius = Convert.ToInt32(Console.ReadLine()); Calculate(radius, out area, out circumference); Console.WriteLine("Area = " + area); Console.WriteLine("Circumference = " + circumference); } static void Calculate(float radius, out float area, out float circumference) { const float pi = 3.14f; area = 2 * pi * radius; circumference = pi * radius * radius; } radius 5420 5 area 5424 circum 5428 78.5 radius 5 area 5424 circum 5428 31.4 www.dotnetvideotutorial.com
- 14. Passing Reference Types Reference type can be passed by value as well by reference If passed by value - content of object reference is passed If passed by reference - reference of object reference is passed 5028 2000 5028 obj www.dotnetvideotutorial.com
- 15. Passing string byvalue static void Main(string[] args) { string str = "Milkyway"; Console.WriteLine("str = " + str); ChangeString(str); Console.WriteLine("nstr = " + str); } static void ChangeString(string str) { Console.WriteLine("nstr = " + str); str = "Andromeda"; Console.WriteLine("nstr = " + str); } 5028 Milkyway Andromeda 5028 5028 6252 6252 str str www.dotnetvideotutorial.com
- 16. Passing string byreference static void Main(string[] args) { string str = "Milkyway"; Console.WriteLine("str = " + str); ChangeString(ref str); Console.WriteLine("nstr = " + str); Console.ReadKey(); } static void ChangeString(ref string str) { Console.WriteLine("nstr = " + str); str = "Andromeda"; Console.WriteLine("nstr = " + str); } 5028 Milkyway Andromeda 5028 6252 6252 2020 2020 str str www.dotnetvideotutorial.com
- 17. Passing Array byvalue static void Main(string[] args) { int[] marks = new int[] { 10, 20, 30 }; Console.WriteLine(marks[0]); ChangeMarks(marks); Console.WriteLine(marks[0]); } static void ChangeMarks(int[] marks) { Console.WriteLine(marks[0]); marks[0] = 70; Console.WriteLine(marks[0]); } 5028 5028 10 20 30 5028 marks marks 70 www.dotnetvideotutorial.com
- 18.
- 19. Passing variable numberof arguments static void Main(string[] args) { Console.Write("Humans : "); printNames("Neo", "Trinity", "Morphious", "Seroph"); Console.Write("Programs : "); printNames("Smith", "Oracle"); } static void printNames(params string[] names) { foreach (string n in names) { Console.Write(n + " "); } Console.WriteLine(); } www.dotnetvideotutorial.com
- 20. Named Arguments static voidMain(string[] args) { int area1 = CalculateArea(width:10,height:15); Console.WriteLine(area1); int area2 = CalculateArea(height: 8, width: 4); Console.WriteLine(area2); } static int CalculateArea(int width, int height) { return width * height; } www.dotnetvideotutorial.com
- 21. Optional Parameters static voidMain(string[] args) { Score(30, 70, 60, 80); Score(30, 70, 60); Score(30, 70); } static void Score(int m1,int m2,int m3 = 50,int m4 = 30) { Console.WriteLine(m1 + m2 + m3 + m4); } www.dotnetvideotutorial.com
- 22.