A simple factorial a number in Java with Error Handling Message.
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Program Listing
/* Factorial.java
* Mr. Jake Rodriguez Pomperada,MAED-IT, MIT
* www.jakerpomperada.com www.jakerpomperada.blogspot.com
* jakerpomperada@gmail.com
* Bacolod City, Negros Occidental Philippines
*/
import java.util.Scanner;
public class Factorial {
public static int factorial (int n){
int result = 1;
if (n==0)
return 1;
else
for (int i=1; i<=n; i++) {
result*=i;
}
return result;
}
public static void main(String[] args){
Scanner input = new Scanner(System.in);
boolean valid;
System.out.println();
do {
System.out.println();
System.out.print("\tFactorial Program in Java with Error Handling\n\n");
System.out.print("\tGive a Number : ");
int number = input.nextInt();
valid = (number >= 0 && number <= 16);
System.out.println();
if (!valid) {
System.out.println("\tNegative Values are Invalid Inputs. Try Again.");
}
else {
System.out.println("\tThe factorial of " + number +
" is " + factorial(number) + ".");
break;
}
}while (!valid);
System.out.println();
System.out.println("\tEnd of Program");
input.close();
}
}
