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shell terminal shell terminal The following is a simple program that requests a number from the user and then calculates the factorial of that number. We'll use two methods in the program, one that checks to see if the user has in fact entered a valid positive integer, and another that calculates the factorial. However we'll start by writing the main method of the program:class Factorial { public static void main(String args[]) { int n; while ((n = getNextInteger()) >= 0) { System.out.println(factorial(n)); } } // main ends here}Among other things this code demonstrates that methods make it possible to design the flow of a program without getting bogged down in the details.

shell terminal 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.

shell terminal 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.

shell terminal 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.

shell terminal

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shell terminal