KING - C# CODING EXAMPLES: PROGRAMMING FOR BEGINNERS

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C# CODING

EXAMPLES

PROGRAMMING FOR BEGINNERS

J KING

C# | Print messages/text (program to print Hello world)

We use two functions to print the message / text, or any value:

Console.Write ();

This feature shows text, values on the output device, and after the message, does not insert a new line.

Console.WriteLine();

This feature shows text, values on the device that is output and adds a new line after the message.

PROGRAM

/*c# basic program to print messages*/

using System;

class HelloWorld {

static void Main() {

//print text without inserting new line after the message

Console.Write("Hello World,");

Console.Write("How are you?");

//print new line

Console.WriteLine();

//print text with new line after the message

Console.WriteLine("Hello World");

Console.WriteLine("How are you?");

//print new line using escape sequence just like C language

Console.WriteLine("Hello World\nHow are you?");

}

}

Output

Hello World,How are you?

Hello World

How are you?

Hello World

How are you?

C# program to print a new line

We may use the following methods to print a new line within the message when printing it on the screen,

• Using \n-print new line
• Using \x0 A or \x A (ASCII literal of \n) prints new line
• Console. WriteLine() prints a new line, if we write some message in the process

PROGRAM

// C# program to print a new line

using System;

using System.IO;

using System.Text;

namespace IncludeHelp

{

class Test

{

// Main Method

static void Main(string[] args)

{

//using \n

Console.WriteLine("Hello\nWorld");

//using \x0A

Console.WriteLine("Hello\x0AWorld");

Console.WriteLine();

Console.WriteLine("end of the program");

//hit ENTER to exit the program

Console.ReadLine();

}

}

}

Output

Hello

World

Hello

World

end of the program

C# program to print size of various data types

We will print the size of the different types of data, we will print the type size, we will use sizeof() operator.

PROGRAM

// C# program to C# program to print

// size of various data types

using System;

using System.IO;

using System.Text;

namespace IncludeHelp

{

class Test

{

// Main Method

static void Main(string[] args)

{

Console.WriteLine("sizeof(int): {0}", sizeof(int));

Console.WriteLine("sizeof(float): {0}", sizeof(float));

Console.WriteLine("sizeof(char): {0}", sizeof(char));

Console.WriteLine("sizeof(double): {0}", sizeof(double));

Console.WriteLine("sizeof(bool): {0}", sizeof(bool));

//hit ENTER to exit the program

Console.ReadLine();

}

}

}

Output

sizeof(int): 4

sizeof(float): 4

sizeof(char): 2

sizeof(double): 8

sizeof(bool): 1

Type conversion from double to int in C# Program

Syntax:

int_variable = (int)double_variable;

Example:

Input:

double a = 123456.789;

int b = 0;

//type conversion

b = (int)a;

Output:

a: 123456.789

b: 123456

PROGRAM

// C# program for type conversion from double to int

using System;

using System.IO;

using System.Text;

namespace IncludeHelp

{

class Test

{

// Main Method

static void Main(string[] args)

{

double a = 123456.789;

int b = 0;

//type conversion

b = (int)a;

Console.WriteLine("value of a: {0}", a);

Console.WriteLine("value of b: {0}", b);

//hit ENTER to exit the program

Console.ReadLine();

}

}

}

Output

value of a: 123456.789

value of b: 123456

Define various types of constants

A constant can be described using const keyword, its value can never be modified once the constant is defined.

Syntax:

const data_type constant_name = value;

const float PI = 3.14f;

Example:

Input:

const int a = 10; //integer constant

Console.WriteLine("a: {0}", a);

Output:

a: 10

PROGRAM

// C# program to define various types of constants

using System;

using System.IO;

using System.Text;

namespace IncludeHelp

{

class Test

{

// Main Method

static void Main(string[] args)

{

const int a = 10; //integer constant

const float b = 20.23f; //float constant

const double c = 10.23; //double constant

const char d = 'Y'; //character constant

const string e = "Hello"; //string constant

//printing values

Console.WriteLine("a: {0}", a);

Console.WriteLine("b: {0}", b);

Console.WriteLine("c: {0}", c);

Console.WriteLine("d: {0}", d);

Console.WriteLine("e: {0}", e);

//hit ENTER to exit the program

Console.ReadLine();

}

}

}

Output

a: 10

b: 20.23

c: 10.23

d: Y

e: Hello

C# program to demonstrate example of arithmetic operators

Example:

Input:

int a = 10;

int b = 3;

//operations

int sum = a + b;

int sub = a - b;

int mul = a * b;

float div = (float)a / (float)b;

int rem = a % b;

Output:

sum = 13

sub = 7

mul = 30

div = 3.333333

rem = 1

PROGRAM

// C# program to demonstrate example of

// arithmetic operators

using System;

using System.IO;

using System.Text;

namespace codingex

{

class Test

{

// Main Method

static void Main(string[] args)

{

int a = 10;

int b = 3;

int sum = a + b;

int sub = a - b;

int mul = a * b;

float div = (float)a / (float)b;

int rem = a % b;

Console.WriteLine("Addition of {0} and {1} is = {2}", a, b, sum);

Console.WriteLine("Subtraction of {0} and {1} is = {2}", a, b, sub);

Console.WriteLine("Multiplication of {0} and {1} is = {2}", a, b, mul);

Console.WriteLine("Division of {0} and {1} is = {2}", a, b, div);

Console.WriteLine("Remainder of {0} and {1} is = {2}", a, b, rem);

//hit ENTER to exit the program

Console.ReadLine();

}

}

}

Output

Addition of 10 and 3 is = 13

Subtraction of 10 and 3 is = 7

Multiplication of 10 and 3 is = 30

Division of 10 and 3 is = 3.333333

Remainder of 10 and 3 is = 1

Program to demonstrate example of bitwise operators

Bitwise operators will be used to perform the bits calculations.

"&" (Bitwise AND)-returns 1 (bit) if both bits are set

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