Call methods in main method
- by Niloo
this is my main method that gets 3 integers from command line and I parse then in my validating method.
However I have one operation method that calls 3 other methods, but i don't know what type of data and howmany I have to put in my operatinMethod() " cuase switch only gets one); AND also in my mainMethod() for calling the operationMehod(); itself?
please let me know if i'm not clear? Thanx!
main method:
public class test {
// Global Constants
final static int MIN_NUMBER = 1;
final static int MAX_PRIME = 10000;
final static int MAX_FACTORIAL = 12;
final static int MAX_LEAPYEAR = 4000;
//Global Variables
static int a,b,c;
public static void main (String[] args) {
for(int i =0; i< args.length; i++){}
if(validateInput(args[0],args[1],args[2])){
performOperations();
}
}
//Validate User Input
public static boolean validateInput(String num1,String num2,String num3){
boolean isValid = false;
try{
try{
try{
a = Integer.parseInt(num1);
if(!withinRange(a,MIN_NUMBER, MAX_PRIME)) {
System.out.println("The entered value " + num1 +" is out of range [1 TO 10000].");
}
isValid = true;
}
catch(Exception ex) {
System.out.println("The entered value " + num1 + " is not a valid integer. Please try again.");
}
b = Integer.parseInt(num2);
if(!withinRange(b,MIN_NUMBER, MAX_FACTORIAL)) {
System.out.println("The entered value " + num2 +" is out of range [1 TO 12].");
}
isValid = true;
}
catch(Exception ex) {
System.out.println("The entered value " + num2 + " is not a valid integer. Please try again.");
}
c = Integer.parseInt(num3);
if(!withinRange(c,MIN_NUMBER, MAX_LEAPYEAR)) {
System.out.println("The entered value " + num3 +" is out of range [1 TO 4000].");
}
isValid = true;
}
catch(Exception ex) {
System.out.println("The entered value " + num3 + " is not a valid integer. Please try again.");
}
return isValid;
}
//Check the value within the specified range
private static boolean withinRange(int userInput ,int min, int max){
boolean isInRange = true;
if(userInput < min || userInput > max){
isInRange = false;
}
return isInRange;
}
//Perform operations
private static void performOperations(int userInput) {
switch(userInput) {
case 1: // count Prime numbers
countPrimes(a);
break;
case 2: // Calculate factorial
getFactorial(b);
break;
case 3: // find Leap year
isLeapYear(c);
break;
}
}
// Verify Prime Number
private static boolean isPrime(int prime) {
for(int i = 2; i <= Math.sqrt(prime) ; i++) {
if ((prime % i) == 0) {
return false;
}
}
return true;
}
// Calculate Prime
private static int countPrimes(int userInput){
int count =0;
for(int i=userInput; i<=MAX_PRIME; i++) {
if(isPrime(i)){
count++;
}
}
System.out.println("Exactly "+ count + " prime numbers exist between "+ a + " and 10,000.");
return count;
}
// Calculate the factorial value
private static int getFactorial(int userInput){
int ans = userInput;
if(userInput >1 ){
ans*= (getFactorial(userInput-1));
//System.out.println("The value of "+ b +"! is "+ getFactorial(userInput));
}
return ans;
}
// Determine whether the integer represents a leap year
private static boolean isLeapYear(int userInput){
if (userInput % 4 == 0 && userInput % 400 == 0 && userInput % 100 ==0){
System.out.println("The year "+ c +" is a leap year");
}
else {
System.out.println("The year "+ c +" is a not leap year");
}
return false;
}
}
