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==Another if else==

<source lang="csharp">
/*
Learning C#
by Jesse Liberty
Publisher: O"Reilly
ISBN: 0596003765
*/
using System;
public class NestIfValues
{
static void Main()
{
int temp = 32;
if (temp <= 32)
{
Console.WriteLine("Warning! Ice on road!");
if (temp == 32)
{
Console.WriteLine(
"Temp exactly freezing, beware of water.");
}
else
{
Console.WriteLine("Watch for black ice! Temp: {0}", temp);
}
}
}
}

</source>

==Demonstrate a block of code==

<source lang="csharp">
/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Demonstrate a block of code.

using System;

public class BlockDemo {
public static void Main() {
int i, j, d;

i = 5;
j = 10;

// the target of this if is a block
if(i != 0) {
Console.WriteLine("i does not equal zero");
d = j / i;
Console.WriteLine("j / i is " + d);
}
}
}

</source>

==Demonstrate the if==

<source lang="csharp">
/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Demonstrate the if.

using System;

public class IfDemo {
public static void Main() {
int a, b, c;

a = 2;
b = 3;

if(a < b) Console.WriteLine("a is less than b");

// this won"t display anything
if(a == b) Console.WriteLine("you won"t see this");

Console.WriteLine();

c = a - b; // c contains -1

Console.WriteLine("c contains -1");
if(c >= 0) Console.WriteLine("c is non-negative");
if(c < 0) Console.WriteLine("c is negative");

Console.WriteLine();

c = b - a; // c now contains 1
Console.WriteLine("c contains 1");
if(c >= 0) Console.WriteLine("c is non-negative");
if(c < 0) Console.WriteLine("c is negative");

}
}

</source>

==Determine if a value is positive, negative, or zero==

<source lang="csharp">
/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Determine if a value is positive, negative, or zero.
using System;

public class PosNegZero {
public static void Main() {
int i;

for(i=-5; i <= 5; i++) {

Console.Write("Testing " + i + ": ");

if(i < 0) Console.WriteLine("negative");
else if(i == 0) Console.WriteLine("no sign");
else Console.WriteLine("positive");
}

}
}

</source>

==Determine if a value is positive or negative==

<source lang="csharp">
/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Determine if a value is positive or negative.
using System;

public class PosNeg {
public static void Main() {
int i;

for(i=-5; i <= 5; i++) {
Console.Write("Testing " + i + ": ");

if(i < 0) Console.WriteLine("negative");
else Console.WriteLine("positive");
}

}
}

</source>

==If Branching==

<source lang="csharp">
/*
Learning C#
by Jesse Liberty
Publisher: O"Reilly
ISBN: 0596003765
*/
using System;
namespace Branching
{
public class TestBranching
{
static void Main()
{
int valueOne = 10;
int valueTwo = 20;
int valueThree = 30;
Console.WriteLine("Testing valueOne against valueTwo...");
if ( valueOne > valueTwo )
{
Console.WriteLine(
"ValueOne: {0} larger than ValueTwo: {1}",
valueOne, valueTwo);
}
Console.WriteLine("Testing valueThree against valueTwo...");
if ( valueThree > valueTwo )
{
Console.WriteLine(
"ValueThree: {0} larger than ValueTwo: {1}",
valueThree, valueTwo);
} // end if
} // end Main
} // end class
} // end namespace

</source>

==If Else==

<source lang="csharp">
/*
Learning C#
by Jesse Liberty
Publisher: O"Reilly
ISBN: 0596003765
*/
using System;
namespace Branching
{
public class TestIfElse
{
static void Main()
{
int valueOne = 10;
int valueTwo = 20;
Console.WriteLine("Testing valueOne against valueTwo...");
if ( valueOne > valueTwo )
{
Console.WriteLine(
"ValueOne: {0} larger than ValueTwo: {1}",
valueOne, valueTwo);
} // end if
else
{
Console.WriteLine(
"Nope, ValueOne: {0} is NOT larger than ValueTwo: {1}",
valueOne, valueTwo);
} // end else
} // end Main
} // end class
} // end namespace

</source>

==If else for int==

<source lang="csharp">
/*
* C# Programmers Pocket Consultant
* Author: Gregory S. MacBeth
* Email: gmacbeth@comporium.net
* Create Date: June 27, 2003
* Last Modified Date:
*/
using System;
namespace Client.Chapter_4___Program_Control
{
public class ifelse
{
static void Main(string[] args)
{
int a = 5, b = 5, c = 10;
if (a == b)
Console.WriteLine(a);
if ((a > c) || (a == b))
Console.WriteLine(b);
if ((a >= c) && (b <= c))
Console.WriteLine(c);
}
}
}

</source>

==illustrates the use of a nested if statement==

<source lang="csharp">
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example4_3.cs illustrates the use of
a nested if statement
*/
public class Example4_3
{
public static void Main()
{
int reactorTemp = 1500;
string emergencyValve = " ";
if (reactorTemp < 1000)
{
System.Console.WriteLine("Reactor temperature normal");
}
else
{
System.Console.WriteLine("Reactor temperature too high!");
if (emergencyValve == "closed")
{
System.Console.WriteLine("Reactor meltdown in progress!");
}
}
}
}

</source>

==Illustrates the use of an if statement that executes a block==

<source lang="csharp">
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example4_2.cs illustrates the use of an if statement
that executes a block
*/
public class Example4_2
{
public static void Main()
{
int smallNumber = 5;
int bigNumber = 100;
if (bigNumber < smallNumber)
{
System.Console.Write(bigNumber);
System.Console.Write(" is less than ");
System.Console.Write(smallNumber);
}
else
{
System.Console.Write(smallNumber);
System.Console.Write(" is less than ");
System.Console.Write(bigNumber);
}
}
}

</source>

==Illustrates the use of the if statement==

<source lang="csharp">
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example4_1.cs illustrates the use of the if statement
*/
public class Example4_1
{
public static void Main()
{
int smallNumber = 5;
int bigNumber = 100;
if (bigNumber > smallNumber)
System.Console.WriteLine(bigNumber + " is greater than " +
smallNumber);
else
System.Console.WriteLine(bigNumber + " is less than " +
smallNumber);
}
}

</source>

==Logical operators with an if statement==

<source lang="csharp">
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example4_4.cs illustrates the use of
logical operators with an if statement
*/
public class Example4_4
{
public static void Main()
{
int reactorTemp = 1500;
string emergencyValve = "closed";
if ((reactorTemp > 1000) && (emergencyValve == "closed"))
{
System.Console.WriteLine("Reactor meltdown in progress!");
}
}
}

</source>

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