Completed

Yashassvi/One.java

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+import java.util.Scanner;
+public class One {
+    public static void main(String[] args) {
+        System.out.println("Input integer");
+        Scanner input = new Scanner(System.in);
+        int n = input.nextInt();
+        if(n> 100 && n<500){
+            if (n%2==0){
+                System.out.println("Even number");
+            }
+            else{
+                System.out.println("Odd Number");
+            }
+        }
+        else {
+            System.out.println("Number is neither greater than 100 nor less than 500.");
+        }
+    }
+
+}
+

Yashassvi/Three.java

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+import java.util.*;
+public class Three {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("Please enter percentage integers");
+        int p = input.nextInt();
+        if (p>90){
+            System.out.println("Your Grade is A\nPerformance : Excellent");
+        }
+        else if(p>75 & p<90){
+            System.out.println("Your Grade is B\nPerformance : Good");
+        }
+        else if(p < 75 & p > 60){
+            System.out.println("Your Grade is C\nPerformance : Pass");
+        }
+        else{
+            System.out.println("fail");
+        }
+    }
+}

Yashassvi/Two.java

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+import java.util.Scanner;
+public class Two {
+    public static void main(String[] args) {
+        System.out.println("Please enter a character.");
+        Scanner input = new Scanner(System.in);
+        char a = input.next().charAt(0);
+        if (a == 'a' || a == 'e' || a== 'i' || a == 'o' || a == 'u'){
+            System.out.println("Entered character is a vowel.");
+        }
+        else {
+            System.out.println("Entered character is a consonant.");
+        }
+    }
+}