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2010-05-26T15:31:53Z

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==How to define methods that return a value and accept parameters==

<source lang="csharp">class Car
{
public int yearBuilt;
public double maximumSpeed;
public int Age(int currentYear)
{
int age = currentYear - yearBuilt;
return age;
}
public double Distance(double initialSpeed, double time)
{
return (initialSpeed + maximumSpeed) / 2 * time;
}
}
class MainClass
{
public static void Main()
{
Car myCar = new Car();
myCar.yearBuilt = 2000;
myCar.maximumSpeed = 150;
int age = myCar.Age(2001);
System.Console.WriteLine("myCar is " + age + " year old.");
System.Console.WriteLine("myCar travels " + myCar.Distance(31, .25) + " miles.");
}
}</source>
<pre class=codeResult>myCar is 1 year old.
myCar travels 22.625 miles.</pre>

==Methods That Return a Value and Accept Parameters==

<source lang="csharp">public class Product {
public int yearBuilt;
public double maximumSpeed;
public int Age(int currentYear) {
int age = currentYear - yearBuilt;
return age;
}
public double Distance(double initialSpeed, double time) {
return (initialSpeed + maximumSpeed) / 2 * time;
}
}

class MainClass{
public static void Main() {
Product redPorsche = new Product();
redPorsche.yearBuilt = 2000;
redPorsche.maximumSpeed = 150;
int age = redPorsche.Age(2001);
System.Console.WriteLine("redPorsche is " + age + " year old.");
System.Console.WriteLine("redPorsche travels " + redPorsche.Distance(31, .25) + " miles.");
}
}</source>

==Return an array==

<source lang="csharp">using System;

class Factor {
public int[] findfactors(int num, out int numfactors) {
int[] facts = new int[80];
int i, j;

for(i=2, j=0; i < num/2 + 1; i++)
if( (num%i)==0 ) {
facts[j] = i;
j++;
}

numfactors = j;
return facts;
}
}

class MainClass {
public static void Main() {
Factor f = new Factor();
int numfactors;
int[] factors;

factors = f.findfactors(1000, out numfactors);

Console.WriteLine("Factors for 1000 are: ");
for(int i=0; i < numfactors; i++)
Console.Write(factors[i] + " ");

Console.WriteLine();
}
}</source>
<pre class=codeResult>Factors for 1000 are:
2 4 5 8 10 20 25 40 50 100 125 200 250 500</pre>

==Return an object==

<source lang="csharp">using System;

class Rect {
int width;
int height;

public Rect(int w, int h) {
width = w;
height = h;
}

public int area() {
return width * height;
}

public void show() {
Console.WriteLine(width + " " + height);
}

public Rect enlarge(int factor) {
return new Rect(width * factor, height * factor);
}
}

class MainClass {
public static void Main() {
Rect r1 = new Rect(4, 5);

Console.Write("Dimensions of r1: ");
r1.show();
Console.WriteLine("Area of r1: " + r1.area());

Console.WriteLine();

// create a rectangle that is twice as big as r1
Rect r2 = r1.enlarge(2);

Console.Write("Dimensions of r2: ");
r2.show();
Console.WriteLine("Area of r2 " + r2.area());
}
}</source>
<pre class=codeResult>Dimensions of r1: 4 5
Area of r1: 20
Dimensions of r2: 8 10
Area of r2 80</pre>

==Return int from function==

<p>Methods return a value to the calling routine using this form of return:</p>

<source lang="csharp">return value;</source>

==Use a class factory==

<source lang="csharp">using System;

class MyClass {
int a, b; // private

// Create a class factory for MyClass.
public MyClass factory(int i, int j) {
MyClass t = new MyClass();

t.a = i;
t.b = j;

return t; // return an object
}

public void show() {
Console.WriteLine("a and b: " + a + " " + b);
}

}

class MakeObjects {
public static void Main() {
MyClass ob = new MyClass();
int i, j;

// generate objects using the factory
for(i=0, j=10; i < 10; i++, j--) {
MyClass anotherOb = ob.factory(i, j); // make an object
anotherOb.show();
}

Console.WriteLine();
}
}</source>
<pre class=codeResult>a and b: 0 10
a and b: 1 9
a and b: 2 8
a and b: 3 7
a and b: 4 6
a and b: 5 5
a and b: 6 4
a and b: 7 3
a and b: 8 2
a and b: 9 1</pre>

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