cgi programming

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cgi programming cgi programming We've simply named two methods, getNextInteger() and factorial() without worrying about their exact implementations. We can add the rest of the code in smaller, easier-to-understand pieces. Let's write the factorial method first.long factorial (long n) { int i; long result=1; for (i=1; i <= n; i++) { result *= i; } return result;} // factorial ends here We could have included this code in our main method, but the algorithm is much easier to understand by breaking the code into smaller, more manageable pieces. It's also easier to test and debug.

cgi programming We can write a simple program that lets us test the factorial method before we worry ourselves with the much harder problem of accepting and validating user input. Here's the test program:class FactorialTest { public static void main(String args[]) { int n; int i; long result; for (i=1; i <=10; i++) { result = factorial(i); System.out.println(result); } } // main ends here static long factorial (int n) { int i; long result=1; for (i=1; i <= n; i++) { result *= i; } return result;} // factorial ends here } C++ programmers should take note that both methods are defined inside the class definition. Once again we see that in Java everything belongs to a class.

cgi programming Let's take a closer look at the syntax of a method: static long factorial (int n) { int i; long result=1; for (i=1; i <= n; i++) { result *= i; } return result;}Methods begin with a declaration. This can include three to five parts. First is an optional access specifier which can be public, private or protected. A public method can be called from pretty much anywhere. A private method can only be used within the class where it is defined.

cgi programming A protected method can be used anywhere within the package in which it is defined. Methods that aren't specifically declared public or private are protected by default.Next we decide whether the method is or is not static. Static methods have only one instance per class rather than one instance per object. All objects of the same class share a single copy of a static method.

cgi programming

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cgi programming