All Solutions

Author: latenightcoder-git

findFactorial.java

@@ -0,0 +1,32 @@
+// Solution 9
+class findFactorial{
+	public static void main(String args[]){
+		factorial(args);
+	}
+	
+	static void factorial(String args[]){
+		if (args.length != 1) {
+            System.out.println("Please provide exactly one number as command-line argument.");
+            return;
+        }
+		int number = Integer.parseInt(args[0]);
+	    int result = factorial(number);
+        System.out.println("Factorial of " + number + " is: " + result);
+		
+	}
+		
+	public static int factorial(int num) {
+		if (num < 0) {
+			System.out.println("Factorial is not defined for negative numbers.");
+			return -1;  
+		}
+
+		int result = 1;
+        
+        for (int i = num; i > 0; i--) {
+            result *= i;
+        }
+        return result;
+	}
+	
+}

greeting.java

@@ -0,0 +1,50 @@
+// Solution 7
+class greeting{
+	public static void main(String args[]){
+		greetingUser(args) ;
+	}
+	
+	static void greetingUser(String args[]){
+		if (args.length != 3) {
+            System.out.println("Please provide only three strings as command line argument.");
+            return;
+		}
+		greetUser(args[0], args[1], args[2]);
+	}
+	
+	public static void greetUser(String str1, String str2, String str3) {
+    
+        System.out.println("Checking the lengths of the strings...");
+
+        switch (getStringLength(str1)) {
+            case 0 , 1 , 2 :
+                System.out.println("First string is too short.");
+                break;
+            default:
+                System.out.println("First string is valid! Greeting...");
+                break;
+        }
+
+        switch (getStringLength(str2)) {
+            case 0 , 1 , 2:
+                System.out.println("Second string is too short.");
+                break;
+            default:
+                System.out.println("Second string is valid! Greeting...");
+                break;
+        }
+
+        switch (getStringLength(str3)) {
+            case 0 , 1 , 2 :
+                System.out.println("Third string is too short.");
+                break;
+            default:
+                System.out.println("Third string is valid! Greeting...");
+                break;
+        }
+    }
+
+    public static int getStringLength(String str) {
+        return str.length();
+    }
+}

numberComparisons.java

@@ -0,0 +1,21 @@
+// Solution 3
+import java.lang.Math;
+class numberComparisons{
+	public static void main(String args[]){
+		displaysmallest(args);
+	}
+	
+	static void displaysmallest(String args[]){
+		if (args.length != 3) {
+            System.out.println("Please provide exactly three numbers.");
+            return;
+        }
+		int number1 = Integer.parseInt(args[0]) ;
+		int number2 = Integer.parseInt(args[1]) ;
+		int number3 = Integer.parseInt(args[2]) ;
+		int largestno = Math.max(number1,number2);
+		int sum = number1 + number2;
+		int smallest = Math.min(sum, number3);
+		System.out.println("The smallest between the sum of the first two numbers and the third number is: " + smallest);
+	}
+}

primeNumberOddcheck.java

@@ -0,0 +1,36 @@
+// Solution 10
+class primeNumberOddcheck{
+	public static void main(String args[]){
+		int number = Integer.parseInt(args[0]);
+		boolean isPrime = isPrime(number);
+        if (isPrime) {
+            System.out.println(number + " is a prime number.");
+        } else {
+            System.out.println(number + " is not a prime number.");
+        }
+		
+		if (isOdd(number)) {
+            System.out.println(number + " is an odd number.");
+        } else {
+            System.out.println(number + " is an even number. Not an odd number. ");
+        }	
+	}
+
+	static boolean isPrime(int num) {
+        if (num <= 1) {
+            return false; // 0 and 1 are not prime
+        }
+
+        for (int i = 2; i <= Math.sqrt(num); i++) {
+            if (num % i == 0) {
+                return false; // number is divisible by i, so it's not prime
+            }
+        }
+        return true; // number is prime
+    }
+
+    static boolean isOdd(int num) {
+        return num % 2 != 0; // Returns true if num is odd, false if even
+    }
+}
+

print1to10.java

@@ -0,0 +1,33 @@
+// Solution 8
+class print1to10{
+	public static void main(String args[]){
+		formethod();
+		whilemethod();
+		dowhilemethod();
+	}
+	
+	static void formethod(){
+		System.out.println("Printing from 1 to 10 using for loop only");
+		for (int i=1;i<=10;i++){
+			System.out.println(i);
+		}
+	}
+	
+	static void whilemethod(){
+		int i=1;
+		System.out.println("Printing from 1 to 10 using while loop only");
+		while (i<=10) {
+			System.out.println(i);
+			i++;
+		};	
+	}
+	
+	static void dowhilemethod(){
+		int i=1;
+		System.out.println("Printing from 1 to 10 using do-while loop only");
+		do {
+			System.out.println(i);
+			i++;	
+		}while(i<=10);
+	}
+}

printing1to7.java

@@ -0,0 +1,14 @@
+// Solution 1
+class printing1to7{
+	public static void main(String args[]){
+		display();
+	}
+	
+	static void display(){
+		for (int i=1;i<=7;i++){
+			if (i==3) System.out.println("I am 3");
+			else if (i==5) System.out.println("I am 5");
+			else System.out.println(i);
+		}
+	}
+}

sum.java

@@ -0,0 +1,19 @@
+// Solution 5
+class sum{
+	public static void main(String args[]){
+		displaysum();
+	}	
+	
+	static void displaysum(){
+		int sum = 0 ;
+		for (int i=1;i<=20;i++){
+			if (i%2==0){
+				sum+=i;
+			}
+			else {
+				continue;
+			}
+		}
+		System.out.println("Sum of even numbers from 1 to 20 is : "+sum);	
+	}
+}

twentyTofour.java

@@ -0,0 +1,14 @@
+// Solution 4
+class twentyTofour{
+	public static void main(String args[]){
+		displaynumbers();
+	}
+	
+	static void displaynumbers(){
+		int i = 20;
+		while (i>3){
+			System.out.println(i);
+			i--;
+		}
+	}
+}

userLogin.java

@@ -0,0 +1,31 @@
+// Solution 6
+class userLogin{
+	public static void main(String args[]){
+		loginCheck(args);
+	}
+	
+	static void loginCheck(String args[]){
+		if (args.length == 0) {
+            System.out.println("Please provide your username and password as a command line argument.");
+            return;
+		}
+		String username = args[0].toUpperCase();
+		String password = args[1].toUpperCase();
+		switch (username) {
+            case "ANKAN" , "SOUPARNA":
+                // Checking password based on username and now password 
+                switch (password) {
+                    case "MADHU" , "TRISHA":
+                        System.out.println("Login successful!");
+                        break;
+                    default:
+                        System.out.println("Invalid password.");
+                        break;
+                }
+                break;
+            default:
+                System.out.println("Invalid username.");
+                break;
+        }
+	}
+}

vowelsconsonantsCounter.java

@@ -0,0 +1,25 @@
+// Solution 2
+class vowelsconsonantsCounter{
+	public static void main(String args[]){
+		displaycounts(args);
+	}
+	
+	static void displaycounts(String args[]){
+		if (args.length == 0) {
+            System.out.println("Please provide your name as a command line argument.");
+            return;
+        }
+		String name=args[0].toUpperCase();
+		System.out.println("The name received is: "+name);
+		int vowels = 0, consonants = 0;
+		for (int i = 0; i < name.length(); i++) {
+			char ch = name.charAt(i);
+			if (ch=='A' || ch=='E' || ch=='I' || ch=='O' || ch=='U'){
+				vowels++ ; 
+			}
+			else consonants++ ;
+		}
+		System.out.println("No. of vowels: "+vowels);
+		System.out.println("No. of consonants: "+consonants);
+	}
+}