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The C# Language
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Although the preceding program is correct, it is not written as efficiently as it could be Specifically, there is no need for the areaPP variable A call to AreaPerPerson( ) can be used in the WriteLine( ) statement directly, as shown here:
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ConsoleWriteLine("house has:\n " + houseFloors + " floors\n " + houseOccupants + " occupants\n " + houseArea + " total area\n " + houseAreaPerPerson() + " area per person");
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In this case, when WriteLine( ) is executed, houseAreaPerPerson( ) is called automatically, and its value will be passed to WriteLine( ) Furthermore, you can use a call to AreaPerPerson( ) whenever the area-per-person of a Building object is needed For example, this statement compares the per-person areas of two buildings:
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if(b1AreaPerPerson() > b2AreaPerPerson()) ConsoleWriteLine("b1 has more space for each person");
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Use Parameters
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It is possible to pass one or more values to a method when the method is called A value passed to a method is called an argument Inside the method, the variable that receives the argument is called a formal parameter, or just parameter, for short Parameters are declared inside the parentheses that follow the method s name The parameter declaration syntax is the same as that used for variables The scope of a parameter is the body of its method Aside from its special task of receiving an argument, it acts like any other local variable Here is a simple example that uses a parameter Inside the ChkNum class, the method IsPrime( ) returns true if the value that it is passed is prime It returns false otherwise Therefore, IsPrime( ) has a return type of bool
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// A simple example that uses a parameter using System; class ChkNum { // Return true if x is prime public bool IsPrime(int x) { if(x <= 1) return false; for(int i=2; i <= x/i; i++) if((x %i) == 0) return false; return true; } } class ParmDemo { static void Main() { ChkNum ob = new ChkNum(); for(int i=2; i < 10; i++) if(obIsPrime(i)) ConsoleWriteLine(i + " is prime");
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6:
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Introducing Classes and Objects
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else ConsoleWriteLine(i + " is not prime"); } }
PART I
Here is the output produced by the program:
2 3 4 5 6 7 8 9 is is is is is is is is prime prime not prime prime not prime prime not prime not prime
In the program, IsPrime( ) is called eight times, and each time a different value is passed Let s look at this process closely First, notice how IsPrime( ) is called The argument is specified between the parentheses When IsPrime( ) is called the first time, it is passed the value 2 Thus, when IsPrime( ) begins executing, the parameter x receives the value 2 In the second call, 3 is the argument, and x then has the value 3 In the third call, the argument is 4, which is the value that x receives, and so on The point is that the value passed as an argument when IsPrime( ) is called is the value received by its parameter, x A method can have more than one parameter Simply declare each parameter, separating one from the next with a comma For example, here the ChkNum class is expanded by adding a method called LeastComFactor( ), which returns the smallest factor that its two arguments have in common In other words, it returns the smallest whole number value that can evenly divide both arguments
// Add a method that takes two arguments using System; class ChkNum { // Return true if x is prime public bool IsPrime(int x) { if(x <= 1) return false; for(int i=2; i <= x/i; i++) if((x %i) == 0) return false; return true; } // Return the least common factor public int LeastComFactor(int a, int b) { int max; if(IsPrime(a) || IsPrime(b)) return 1; max = a < b a : b; for(int i=2; i <= max/2; i++) if(((a%i) == 0) && ((b%i) == 0)) return i;
Part I:
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